Abstract:
Provided is an IP uncompressed video encoder that converts an IP packet stream of uncompressed video to an IP packet stream of compressed video. The invention is a video encoder that produces an IP packetized stream of compressed video from an IP packetized stream of an uncompressed video signal, comprising: receiving means packetizing, from a network, one or a plurality of IP packetized streams of an uncompressed video signal; retrieving means for retrieving video data from the one or plurality of IP packetized streams of the uncompressed video signal; compressing means for compressing the retrieved video data; and transmitting means configured to IP packetize video compressed by the compressing means to create and transmit a stream of compressed video.

Description:
[0001]    This is a Division of application Ser. No. 14/781,389 tiled Sep. 30, 2015, which in turn is a U.S. National Stage of PCT/ P2014/001861, filed Mar. 28, 2014, which claims foreign priority to: JP 013-079661, filed Apr. 5, 2013; JP 2013-079662, filed Apr. 5, 2013; and. JP 2013-079664, filed Apr. 5, 2013. The disclosure of the prior applications is hereby incorporated by reference herein in its entirety. 
     
    
     TECHNICAL FIELD 
       [0002]    The present invention relates to a video encoder and decoder, and more particularly, to a video encoder that converts an IP packet stream of uncompressed video into an IP packet stream of compressed video, and a video decoder that converts an IP packet stream of compressed video into an IP packet stream of uncompressed video. 
       BACKGROUND ART 
       [0003]    In a video encoder of the related art that compresses and transmits video, an uncompressed digital video signal such as 3G-SDI, HD-SDI, or SD-SDI is input, compressed using compression technology such as MPEG-2, 11.264, or JPEG 2000, and the compressed data is stored in MPEG-2 TS format and transmitted over DVB-ASI or Ethernet (registered trademark). In addition, in a video decoder of the related art, the data is received over DVB-ASI or Ethernet, which has been stored in MPEG-2 TS format and compressed using compression technology such as MPEG-2, and the compressed data is decoded and output as an uncompressed digital video signal such as 3G-SDI, HD-SDI, SD-SDI, or HDMI (registered trademark). 
         [0004]    Regarding transmission of IP packet stream over Ethernet and reception of IP packet stream over Ethernet, video encoders and video decoders that transmit and receive using a packet format and forward error correction (FEC) scheme conforming to the SMPTE 2022-1/2 specification standardized by the Society of Motion Picture and Television Engineers (SMPTE) are increasing. 
         [0005]      FIG. 1  includes diagram illustrating a video encoder of the related art. The video encoder  100  illustrated in  FIG. 1  includes an HD-SDI input interface unit  101 , an encoder control unit  102  that outputs video data and audio data from an input HD-SDI signal, an H.264 video encoder  103  that compresses and encodes retrieved video data, an AAC audio encoder  104  that compresses and encodes retrieved audio data, an MPEG-2 TS generator  105  that generates an MPEG-2 TS in which the compressed and encoded video data and the compressed and encoded audio data are multiplexed, a signal conversion unit  106  that IP packetizes the compressed video signal, and an IP output interface  107  that outputs a IP packet stream  120  of compressed video. 
         [0006]    The video encoder  100  receives an HD-SDI uncompressed digital video signal  110  from a coaxial cable  111  with the HD-SDI input interface unit  101 , compresses the video data with the H.264 video encoder  103 , and compresses the audio data with the AAC audio encoder  104 . Next, the compressed video and audio data is stored and multiplexed in MPEG-2 TS format by the MPEG-2 TS generator  105 , IP packetized by the signal conversion unit  106 , and an IP packet stream  120  of compressed video conforming to the SMPTE 2022-1/2 specification is transmitted from the IP output interface  107  over a 1 Gbps Ethernet  121 . 
         [0007]      FIG. 2  is a configuration diagram illustrating a video decoder of the related art. The decoder  200  illustrated in  FIG. 2  includes an IP input interface unit  201 , a signal extraction unit  202  that retrieves an MPEG-2 TS from an input IP packet stream, a decoder control unit  203  that outputs compressed video data and compressed audio data from the MPEG-2 TS, an H.264 video decoder  204  that decompresses and decodes the retrieved video data, an AAC audio decoder  205  that decompresses and decodes the retrieved audio data, an audio embedding unit  206  that generates an uncompressed video signal from the decompressed and decoded video data and audio data, and an HD-SDI output interface unit  207  that outputs the uncompressed video signal as an HD-SDI video signal. 
         [0008]    The video decoder  200  receives an IP packet stream  210  of compressed video from a 1G Ethernet  211  with the IP input interface unit  201 , and with the signal extraction unit  202 , retrieves an MPEG-2 TS from the input IP packet stream  210 . In the decoder control unit  203 , the MPEG-2 TS extracted with the signal extraction unit  202  is separated into compressed video data. and compressed audio data. The compressed video data and the compressed audio data is decompressed and decoded by the H.264 video decoder  204  and the AAC audio decoder  205 , respectively. Next, in the audio embedding unit  206 , the audio data is embedded into the decompressed and decoded video data to generate an uncompressed video signal, and the uncompressed video signal  220  is transmitted from the HD-SDI output interface unit  207  over the coaxial cable  221 . 
         [0009]    A video encoder that receives an uncompressed video signal such as 3G-SDI, HD-SDI, or SD-SDI is often used by being connected to a camera at a stadium or the like, or used when processing video inside a broadcasting station. Consequently, convenience of operation is important, and the above video encoder is convenient in that by simply connecting a coaxial cable carrying an uncompressed video signal to the input, a DVB-ASI signal carrying a compressed video signal may be obtained on the output coaxial cable, or a compressed video signal stored in the SMPTE 2022-2 format may be obtained on the output Ethernet. 
         [0010]    However, regarding the video signal, only one data. stream or one pair of data streams (in the case of 3G-SDI Level-B) is sent on one coaxial cable or optical fiber cable. For this reason, in a system in a broadcasting station or the like that handles multiple video data streams, it is necessary to install a number of video encoders proportional to the number of video data streams, or install a switching device such as a matrix switcher for selecting a video signal to input into the video encoder from among multiple uncompressed video signals. Likewise, for the video decoder, it becomes necessary to provide a number of video decoders proportional to the number of video data streams, as well as a switching device such as a matrix switcher for selecting the uncompressed video signal to use inside the broadcasting station from among the multiple uncompressed video signals output from these video decoders. 
         [0011]      FIG. 3  is a diagram illustrating a video delivery system  300  provided with a number of video encoders of the related art in proportion to the number of video data streams.  FIG. 4  is a diagram illustrating a video delivery system  400  provided with a matrix switcher. Both  FIGS. 3 and 4  illustrates systems that collect video from a large number of arenas at a broadcasting center, and after compressing the video with video encoders, transmit the video to a broadcasting station. 
         [0012]    In the system  300  of  FIG. 3 , video encoders  322 - 1  to  322 - 99  are includes in the broadcasting center  320  in order to encode each video from stadium  310 - 1  to  310 - 10 . 
         [0013]    The videos compressed by the video encoders  322 - 1  to  322 - 99  are input into a video transmission. unit  323 , and in the video transmission unit  323 , a specific video is selected, processed, and sent over an external network. 
         [0014]    In the system  400  of  FIG. 4 , the matrix switcher  424  selects video signals to input into video encoders  422 - 1  to  422 - 2  from among video signals from stadiums  410 - 1  to  410 - 10 . The videos compressed by the video encoders  422 - 1  to  422 - 2  are input into a video transmission unit  423 , and after being processed, are sent over an external network. 
         [0015]    An uncompressed video signal such as 3G-SDI, HD-SDI, or SD-SDI is ordinarily transmitted using coaxial cable. However, there is a distance limitation on the transmission of a video signal using coaxial cable. Therefore, in order to transmit the video signals of the stadiums  310 - 1  to  310 - 10  or  410 - 1  to  410 - 10  to the broadcasting center  320  or  420 , equipment that converts an electrical signal into an optical signal is used, and the optical signal is transmitted over optical fiber cable. In  FIG. 3 , HD-SDI video signals output by cameras  311 - 1  to  311 - 99  are converted from electrical signals to optical signals using LID (electrical-to-optical) converters  312 - 1  to  312 - 99 , transmitted over optical fiber, and at the broadcasting center  320 , converted again from optical signals to electrical signals using O/E (optical-to-electrical) converters  321 - 1  to  321 - 99 . Similarly, in  FIG. 4 , HD-SDI video signals output by cameras  411 - 1  to  411 - 99  are converted from electrical signals to optical signals using E/O converters  412 - 1  to  412 - 99 , transmitted over optical fiber, and at the broadcasting center  420 , converted again from optical signals to electrical signals using O/E converters  421 - 1  to  421 - 99 . 
         [0016]    Also,  FIG. 5  is a diagram that illustrates a broadcasting station system  500  includes a number of video decoders of the related art in proportion to the number of video data streams, and illustrates a system that receives video from an external stadium or another broadcasting station, and delivers the video to an editing system, transmission system, and monitor group inside the broadcasting station. 
         [0017]    In the system of  FIG. 5 , video from cameras  511 - 1  to  511 - 99  of arenas  510 - 1  to  510 - 10  is encoded inside each stadium using video encoders  512 - 1  to  512 - 99 , and sent to the broadcasting station  520  via a 1 Gbps Ethernet. Compressed video from other broadcasting stations  531  and  532  is similarly sent to the broadcasting station  520  via the 1 Gbps Ethernet. The broadcasting station  520  is provided with video decoders  522 - 1  to  522 - 101  for decoding IP packet streams of compressed video received over the above 1 Gbps Ethernet. Each HD-SDI uncompressed video signal including video data decoded by the video decoders  522 - 1  to  522 - 101  is input into a matrix switcher  521 . HD-SDI uncompressed video signals required by an editing system  524 , a transmission system  525 , and a monitor group  523  are selected by the matrix switcher  521 , and output to the respective systems and the monitor group. 
         [0018]    In this way, with the technology of the related art, in a sports broadcast system that broadcasts by switching video from multiple stadiums depending on the time, or a system that selects and compresses multiple video signals selectively from among a large number of uncompressed video signals, such as an internal distribution system of a broadcasting station that receives and distributes a large number of videos from outside sources, it is necessary to prepare video encoders individually for all uncompressed video signals in advance, or place a matrix switcher for video signals near a video encoder and switch the video to be encoded. 
         [0019]    Additionally, in a system that receives video from multiple stadiums or other broadcasting stations and distributes the video in a broadcasting station, in order to link up with. an. uncompressed video signal processing system using coaxial cable in the broadcasting station, it is necessary to prepare video decoders individually for each IP packet stream received externally, and use a matrix switcher for video signals to select the signal required by each system in the broadcasting station from among the uncompressed video signals output by these video decoders. 
         [0020]    With these systems, it is often necessary to install inactive equipment as illustrated in the example of  FIG. 3 , or in other words, video encoders must be prepared even for video from stadiums where broadcasting is not being conducted. At sports events such as the soccer World Cup and the Olympics, it is clearly unrealistic to reorganize the equipment according to the day-to-day competition schedule. 
         [0021]    One method of reducing the number of inactive equipment is to take a configuration as illustrated in  FIG. 4 . However, the configuration in  FIG. 4  requires the preparation of an extremely costly matrix switcher. Furthermore, the number of selected videos is limited by the number of physical ports on the matrix switcher, and there is a problem in that system flexibility is lost. 
         [0022]    Furthermore, the system configuration in  FIG. 5  requires the preparation of both a large number of video encoders and a matrix switcher, and system flexibility is also lost. 
         [0023]    Another problem in the case of using the technology of the related art is the cost of constructing the transmission lines. As illustrated in  FIGS. 3 and 4 , converting a video signal from an electrical signal to an optical signal and then from an optical signal back to an electrical signal incurs the costs of purchasing and installing dedicated equipment. 
         [0024]    Furthermore, dedicated optical fiber service provided by a communications carrier under the name of dark fiber or the like incurs enormous service fees depending on the country. With these systems designed for coaxial cable, there is also a problem in that laying cable is laborious, and running cable in a broadcasting station or the like incurs enormous costs. 
         [0025]    On the other hand, with recent advances in IT technology, broadcasting systems are transitioning to an Internet Protocol (IP) base. This trend is described in, for example, “Broadcasting Facilities and Operations”, Journal of the Institute of Image Information and Television Engineers, Vol. 67, No. 5 (2013). IP-based systems are also coming to be used in video delivery systems. in these IP-based broadcasting systems, video signals are IP packetized and transmitted using the Real-Time Transport Protocol (RTP). Consequently, making a broadcasting system IP-based requires video encoders and video decoders designed to be used on an IP network. 
         [0026]    However, encoders of the related art only receive an uncompressed digital video signal such as HD-SDI, store data compressed using compression technology such as H.264 in MPEG-2 TS format, and transmit the compressed data over Ethernet, like the encoder discussed earlier and illustrated in  FIG. 1 . Consequently, an encoder of the related art is unable to compress and encode uncompressed video until after an IP packet stream of uncompressed video goes through a process of being converted to an uncompressed digital video signal such as BD-SDI first. 
         [0027]    In addition, video decoders of the related art can only receive data that has been stored in MPEG-2 TS format and compressed using compression technology such as MPEG-2 over Ethernet or the like, decode the compressed data, and output the result as an uncompressed digital video signal such as HD-SDI, like the video decoder illustrated in  FIG. 2 . Consequently, a decoder of the related art is only able to output decompressed digital video signal such as HD-SDI, then the output of the decoder is unable to deliver to IP network directly. 
         [0028]    However, conducting IP/HD-SDI signal conversion first in this way requires a video transmission device that conducts IP/HD-SDI signal conversion in addition to the encoder or decoder, and the number of pieces of equipment increases. 
       SUMMARY OF INVENTION 
       [0029]    An objective of the present invention is to solve the problems discussed above, and provide a video encoder and a video decoder making it possible to decrease the ratio of inactive equipment, and without requiring a costly matrix switcher, increase system flexibility and decrease costs for transmission line construction and the laying of cable. To achieve this objective, the present invention provides a video encoder and a video decoder designed to be used on an IP network. 
         [0030]    The video encoder and video decoder of the present invention is a video encoder that produces an IP packetized stream of compressed video from an IP packetized stream of an uncompressed video signal. 
         [0031]    To realize this function, the video encoder of the present invention includes: receiving means for receiving, from a network, one or a more IP packetized streams of an uncompressed video signal; retrieving means for retrieving video data from the received packetized stream of an uncompressed video signal; compressing means for compressing the retrieved video data; creating means for IP packetizing the compressed video data to create a stream of compressed video; and transmitting means for transmitting the IP packetized stream of compressed video. Thus, it becomes possible to retrieve video data from an IP packet stream of an uncompressed video signal received by the receiving means, compress the retrieved video data, create an IP packetized stream of compressed video from the compressed video data, and transmit the stream of compressed video over a network. 
         [0032]    Furthermore, the video encoder of the present invention further may include retrieving means for retrieving audio data from an IP packetized stream of an uncompressed video signal, and compressing means for compressing the retrieved audio data. Thus, by having the transmitting means further include transmitting means for IP packetizing to transmit compressed audio, it becomes possible to compress, IP packetize, and transmit the retrieved audio data. 
         [0033]    In addition, the video encoder of the present invention may include: receiving means for receiving one or a more IP packetized streams of uncompressed video; retrieving means for retrieving video data from the IP packetized stream of uncompressed video; compressing means for compressing the retrieved video data; transmitting means W packetizing video compressed by the compressing means to create and transmit a stream of compressed video; a receiving-side switch for distributing, to a plurality of the receiving means, IP packet streams received by the plurality of network interfaces; and a transmitting-side switch for distributing the IP packet streams created by the plurality of the transmitting means to a plurality of network interfaces. Thus, it becomes possible to use a switch on the receiving side to select, and distribute to the receiving means, a stream to be compressed from among IP packetized streams of uncompressed video signals received from a plurality of network interfaces, retrieve video data from an IP packet stream of an uncompressed video signal with the retrieving means, compress the retrieved video data, create an IP packetized stream of compressed video from the compressed video data, and transmit the stream of compressed video over a network. 
         [0034]    Herein, regarding the receiving-side switch and the transmitting-side switch, depending on the configuration of the network applying the present invention, application is also possible in which the network interface and the receiving means are joined directly without a receiving-side switch, or in which the transmitting means and the network interface are joined directly without a transmitting-side switch. 
         [0035]    In addition, in the case of a specific implementation of the present invention, the use of an Ethernet switch supporting Layer 2 or Layer 3 of the Open Systems Interface. (OSI) reference model as a switch is conceivable, Such switches commercialized by Broadcom. or Marvell Semiconductor are bidirectional switches, enabling the receiving-side switch and the transmitting-side switch to be realized using the same single switch. 
         [0036]    Furthermore, the video encoder of the present invention further may include: retrieving means for retrieving audio data from the IP packetized stream of an uncompressed video signal; and compressing means for compressing the retrieved audio data. Thus, by having the transmitting means further include transmitting means for IP packetizing to transmit compressed audio, it becomes possible to compress, IP packetize, and transmit the retrieved audio data. 
         [0037]    Furthermore, the video decoder of the present invention includes: receiving means for receiving one or a more IP packetized streams of compressed video data; retrieving means for retrieving compressed video data from the IP packetized stream of compressed video; decoding means for decoding the retrieved compressed video data; transmitting means IP packetizing the video decoded by the decoding means to create and transmit a stream of uncompressed video; a receiving-side switch for distributing, to a plurality of the receiving means, IP packet streams received from a plurality of network interfaces; and a transmitting; side switch for distributing the IP packet streams created by the plurality of the transmitting means to a plurality of network interfaces. Thus, it becomes possible to use a switch on the receiving side to select, and distribute to the receiving means, a stream to be decoded from among IP packet streams of compressed video data received from a plurality of network interfaces, retrieve compressed video data from an IP packet stream of compressed video data with the retrieving means, decode the retrieved compressed video data, create an IP packet stream of an uncompressed video signal from the decoded uncompressed video data, and transmit an IP packet stream of the uncompressed video over a network. 
         [0038]    Herein, regarding the receiving-side switch and the transmitting-side switch, depending on the configuration of the network applying the present invention, application is also possible in which the network interface and the receiving means are joined directly without a receiving-side switch, or in which the transmitting means and the network interface are joined directly without a transmitting-side switch. 
         [0039]    In addition, in the case of a specific implementation of the present invention, the use of an Ethernet switch supporting Layer 2 or Layer 3 of the OSI reference model as a switch is conceivable. Such switches commercialized by Broadcom or Marvell Semiconductor are bidirectional switches, enabling the receiving-side switch and the transmitting-side switch to be realized using the same single switch. 
         [0040]    Furthermore, the video decoder of the present invention further may include: retrieving means to retrieving audio data from the IP packetized stream; decoding means for decoding the retrieved audio data; and embedding means for incorporating the decoded audio data into the IP packet stream of the uncompressed video signal. Thus, it becomes possible to use the decoding means to decode audio data retrieved by the retrieving means, and incorporate the decoded audio data into the IP packet stream of the uncompressed video signal. 
         [0041]    According to the present invention, an IP packetized uncompressed video signal may be transmitted directly to an. IP uncompressed video encoder of the present invention, and an IP packet stream of compressed video may be generated. Consequently, by using an IP network as the transmission line and utilizing IP network routing and switching, it is possible to decrease the ratio of inactive equipment in a video delivery system, and without using a costly matrix switcher, increase system flexibility and decrease costs for transmission line construction and the laying of cable. Additionally, since an uncompressed video signal may be encoded into a compressed video signal from inside the network, it becomes possible construct a completely new form of broadcasting network. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0042]      FIG. 1  is a configuration diagram illustrating a video encoder of the related art; 
           [0043]      FIG. 2  is a configuration diagram illustrating a video decoder of the related art; 
           [0044]      FIG. 3  is a configuration diagram illustrating a video delivery system of the related art; 
           [0045]      FIG. 4  is a configuration diagram illustrating a video delivery system of the related art; 
           [0046]      FIG. 5  is a configuration diagram illustrating a broadcasting system of the related art; 
           [0047]      FIG. 6  is a configuration diagram illustrating an IP uncompressed video encoder according to a first embodiment of the present invention; 
           [0048]      FIG. 7  is a diagram illustrating the FEC scheme and packet format stipulated by SMPTE 2022-5/6; 
           [0049]      FIG. 8  is a diagram illustrating the FEC scheme and packet format stipulated by SMPTE 2022-1/2; 
           [0050]      FIG. 9  is a configuration diagram of a video transmission system using the IP uncompressed video encoder of  FIG. 6 ; 
           [0051]      FIG. 10  is a flowchart from IP packetization of uncompressed video up to decoding an IP packet stream of compressed video and outputting to HD-SDI in the video transmission system of  FIG. 9 ; 
           [0052]      FIG. 11  is a configuration diagram of a video delivery system obtained by applying the IP uncompressed video encoder of  FIG. 6  to a video delivery system of the related art; 
           [0053]      FIG. 12  is a configuration diagram illustrating an IP uncompressed video encoder according to a second embodiment of the present invention; 
           [0054]      FIG. 13  is a configuration diagram of a video transmission system using the IP uncompressed video encoder of  FIG. 12 ; 
           [0055]      FIG. 14  is a flowchart from IP packetization of uncompressed video up to decoding an IP packet stream of compressed video and outputting to HD-SDI in the video transmission system of  FIG. 13 ; 
           [0056]      FIG. 15  is a configuration diagram of a video delivery system obtained by applying the IP uncompressed video encoder of  FIG. 12  to a video delivery system of the related art; 
           [0057]      FIG. 16  is a configuration diagram illustrating an IP uncompressed video decoder according to a third embodiment of the present invention; 
           [0058]      FIG. 17  is a configuration diagram of a video transmission system using the IP uncompressed video decoder of  FIG. 16 ; 
           [0059]      FIG. 18  is a flowchart from creation of an IP packet stream of compressed video from uncompressed video up to outputting to HD-SDI on the receiving side in the video transmission system of  FIG. 17 ; and 
           [0060]      FIG. 19  is a configuration diagram of a video delivery system obtained by applying the IP uncompressed video decoder of  FIG. 16  to a video delivery system of the related art. 
       
    
    
     DESCRIPTION OF EMBODIMENTS 
       [0061]    Hereinafter, embodiments of the present invention will be described in detail and with reference to the drawings. 
       First Embodiment 
       [0062]      FIG. 6  is a configuration diagram illustrating an IP uncompressed video encoder according to a first embodiment of the present invention. The IP uncompressed video encoder illustrated in  FIG. 6  receives an IP packet stream of uncompressed video in a packet format and FEC scheme conforming to SMPTE 2022-5/6 from a 10 Gbps Ethernet  651 , and transmits an IP packet stream of compressed video conforming to the SMPTE 2022-1/2 specification to a 1 Gbps Ethernet  652 . 
         [0063]    Herein,  FIG. 7  illustrates the packet format stipulated by SMPTE 2022-6 and the FEC scheme stipulated by SMPTE 2022-5. Uncompressed video is loaded into and transmitted. in the media payload field of the IP packet of  FIG. 7 . The media payload has a fixed length of 1376 octets. With the EEC scheme of SMPTE 2022-5 illustrated in  FIG. 7 , on the transmitting side, an exclusive OR computation is performed in row units and column units by creating an L×D matrix from the data in the media payload in the IP packet conforming to SMPTE 2022-6. By this computation of the data, FEC data is generated, and a dedicated FEC IP packet is created and transmitted. Meanwhile, on the receiving side, a matrix similar to the transmitting side is created, and the received SMPTE 2022-6 IP packet and FEC packet are used to perform an exclusive OR computation in row units and column units similarly to the transmitting side. Consequently, even if packet loss occurs, the lost packet may be reconstructed, SMPTE 2022-5 stipulates that possible FEC modes include support for rows only, support for rows and columns, selection of a number of rows and a number of columns, and the like, but since this lies outside the primary scope of the description related to the present invention, description thereof will be omitted. 
         [0064]      FIG. 8  illustrates the packet format stipulated by SMPTE 2022-2 and the FEC scheme stipulated by SMPTE 2022-1. Compressed video is loaded into and transmitted. in the MPEG-2 TS payload field of  FIG. 8 . This field may carry a maximum of up to seven MPEG-2 TS. The FEC scheme of SMPTE 2022-1 illustrated in  FIG. 8  has different restrictions on the size of the matrix and the like, but the basic operating principle is the same as in SMPTE 2022-5 of  FIG. 7 . 
         [0065]    Returning again to  FIG. 6 , the IP uncompressed video encoder  600  illustrated in  FIG. 6  includes an IP input interface unit  610  that receives an IP packet stream of uncompressed video, an encoder unit  620  that compresses and encodes the received IP packet stream of uncompressed video, and an IP output interface unit  630  that outputs the compressed IP packet stream. The IP input interface unit  610  includes a 10 Gbps Ethernet packet processing unit  611 , an FEC processing unit  612 , and buffer memory  613  for FEC control. The packet processing unit  611  inspects an IP packet stream  601  input from the  10  Gbps Ethernet  651  in the media access control (MAC) layer, the IP layer. The packet processing unit  611  the UDP layer, and the RTP layer, and forwards to the FEC processing unit  612  only IP packets for which the MAC address and the IP address match addresses required by the IP uncompressed video encoder  600 , and for which the FCS inspection, packet length inspection, and checksum inspection results are correct. The FEC processing unit  612  writes IP packets from the packet processing unit  611  to the buffer memory  613  for FEC control, and also controls the FEC matrix as the receiving side. If the FEC processing unit  612  judges that the IP packets needed to construct a designated FEC matrix have all been written to the buffer memory  613 , the FEC processing unit  612  reads out data for the relevant FEC matrix from the buffer memory  613 , and by performing FEC computations, reconstructs lost packets and conducts an error correction process. The eror-corrected IP packet stream is sent by the FEC processing unit  612  to the encoder unit  620 . 
         [0066]    The encoder unit  620  includes a signal extraction unit  621  that retrieves an uncompressed video signal from an IP packet stream input into the IP uncompressed video encoder, an encoder control unit  622  that receives the retrieved uncompressed video signal, and outputs video data and audio data, an encoder  623  that compresses and encodes the retrieved video data and audio data, an MPEG-2 TS multiplexer  624 , and a signal conversion unit  625  that IP packetizes the compressed video signal. 
         [0067]    The signal extraction unit  621  inspects RTP sequence numbers in the IP packet stream from the FEC processing unit  612  of the IP input interface unit  610 , and for correct IP packets, removes the RTP, UDP, IP, and MAC headers, and extracts and forwards an uncompressed video signal  602  to the encoder control unit  622 . 
         [0068]    The encoder control unit  622  extracts video data  603  and audio data  604 - 1  to  604 - 8  from the uncompressed video signal  602  input from the signal extraction unit  621 , and forwards the extracted data to the encoder  623 . For the extraction of video data and audio data from a 3G-SDI, HD-SDI, or SD-SDI uncompressed video signal  602 , extraction is conducted by extracting data from designated fields on the basis of the SMPTE 424M, 292M, or 259M standard, respectively. For the audio data, although 3G-SDI and HD-SDI support up to a maximum of 16 channels, in the present embodiment, 8 channels are encoded. 
         [0069]    The encoder  623  includes of a video encoder  626  that compresses uncompressed video data according to H.264 coding, and an audio encoder  627  that compresses 8 channels of audio data into Advanced Audio Coding (AAC) audio. 
         [0070]    The video encoder  626  receives the uncompressed video data  603  from the encoder control unit  622 , and outputs a packetized elementary stream (PES)  605  of H.264 compressed video. The audio encoder  627  receives the audio data  604 - 1  to  604 - 8  from the encoder control unit  622 , and outputs compressed audio PESs  606 - 1  to  606 - 8  compressed with AAC. 
         [0071]    The MPEG-2 TS multiplexer  624  receives the compressed video PES  605  from the video encoder  626  and the compressed audio PESs  606 - 1  to  606 - 8  from the audio encoder  627 , creates TS packets, and produces a multiplexed MPEG-2 TS  607 . 
         [0072]    The signal conversion unit  625  IP packetizes the MPEG-2 TS  607  on the basis of the SMPTE 2022-2 specification by inserting the MPEG-2 TS  607  into RTP payloads in units of 7 TS packets, and adding an RTP header, a UDP header, and an IP header. 
         [0073]    The IP output interface unit  630  includes an FEC processing unit  632 , buffer memory  633  for FEC control, and a 1 Gbps Ethernet packet processing unit  631 . The FEC processing unit  632  writes IP packets from the signal conversion unit  625  into the buffer memory  633  for FEC control, and also controls the FEC matrix as the transmitting side. If the FEC processing unit  632  judges that the IP packets needed to construct a designated FEC matrix have all been written to the buffer memory  633 , the FEC processing unit  632  reads out data for the relevant FEC matrix from the buffer memory  633 , and by performing FEC computations, generates FEC packets. The FEC packets, as well as the IP packets from the signal conversion unit  625 , are sent from the FEC processing unit  632  to the packet processing unit  631  in a designated order prescribed by SMPTE 2022-1. 
         [0074]    The packet processing unit  631  attaches the MAC header and the FCS to the IP packets from the FEC processing unit  632 , performs processing in the 1 Gbps Ethernet MAC sublayer, and transmits the IP packets  608  over the 1 Gbps Ethernet  652 . 
         [0075]      FIG. 9  is a configuration diagram illustrating a video transmission system  900 , which is a video transmission system using the IP uncompressed video encoder  600  illustrated in  FIG. 6 . The video transmission system  900  includes a camera  930 , an uncompressed video transmission device  910  connected to the camera  930  by a coaxial cable  951 , the IP uncompressed video encoder  600  connected to the uncompressed video transmission device  910  by the 10 Gbps Ethernet  651 , and an IP decoder  920  connected to the IP uncompressed video encoder  600  by the 1 Gbps Ethernet  652 . The IP decoder  920  is connected to a coaxial cable  952  for outputting an HD-SDI uncompressed video signal  902 , or an HDMI cable  953  for outputting an HDMI uncompressed video signal  903 . 
         [0076]    The uncompressed video transmission device  910  is a device that receives an HD-SDI uncompressed video signal  901  from the camera  930  via the cable  951 , packetizes the video signal in conformance with the FEC scheme and packet format of SMPTE 2022-5/6, and transmits the packets over the 10 Gbps Ethernet  651 . A device having this function has already been commercialized as of 2012, such as the MD8000 by Media Global Links (registered trademark), for example. The IP decoder  920  is a device that receives and decodes an IP packet stream conforming to the FEC scheme and packet format of SMPTE 2022.4/2 from the 1 Gbps Ethernet  652 , and outputs the HD-SDI uncompressed video signal  902  or  903 . Devices having this function have already been commercialized as of 2012, by multiple companies such as Tandberg (registered trademark), NEC (registered trademark), and Fujitsu (registered trademark). 
         [0077]    In the video transmission system  900  of  FIG. 9 , the IP packet stream  601  of uncompressed video that has been IP packetized by the uncompressed video transmission device  910  is input into the IP uncompressed video encoder  600  via the  10  Gbps Ethernet  651 , and converted into an IP packet stream  608  of compressed video. The IP packet stream  608  of compressed video is input from the IP uncompressed video encoder  600  into the IP decoder  920  via the 1 Gbps Ethernet  652 . In the IP decoder  920 , the IP packet stream of compressed video is decoded, and output as the HD-SDI uncompressed video signal  902  via the cable  952 , or as the HDMI uncompressed video signal  903  via the cable  953 . 
         [0078]      FIG. 10  is a flowchart illustrating the sequential flow from the IP packetization of uncompressed video up to decoding an IP packet stream of compressed video and outputting to HD-SDI in the video transmission system  900  of  FIG. 9 . 
         [0079]    In step  1001 , an HD-SDI video signal is IP packetized by the uncompressed video transmission device  910  using the FEC scheme and packet format conforming to the SMPTE 2022-5/6 specification, and the IP packet stream  601  is transmitted over the 10 Gbps Ethernet  651 . 
         [0080]    In step  1002 , the IP packet stream  601  transmitted over the 10 Gbps Ethernet  651  is input into the IP input interface unit  610  of the IP uncompressed video encoder  600 . 
         [0081]    In step  1003 , the IP packet stream  601  undergoes checks in the IP layer, the UDP layer, and the RTP layer by the IP input interface unit  610 . An FEC process is conducted only on error-free IP packets for which the MAC address and the IP address match addresses required by the IP uncompressed video encoder  600 , whereas lost packets are recovered by error correction. A packet group including packets recovered by error correction is sent to the signal extraction unit  621  of the encoder unit  620 . 
         [0082]    In step  1004 , the signal extraction unit  621  inspects RTP sequence numbers in the IP packet stream, and for correct IP packets, removes the RTP, UDP, IP, and MAC headers, and forwards the resulting uncompressed video signal to the encoder control unit  622 . The encoder control unit  622  extracts video data and  8 -channel audio data from the uncompressed video signal from the signal extraction unit  621 , and forwards the extracted data to the encoder  623 . 
         [0083]    In step  1005 , the encoder  623  compresses the video signal retrieved by the encoder control unit  622  according to H.264 coding, and outputs a PES of H.264 compressed video. In addition, the encoder  623  compresses the 8-channel audio signal retrieved by the encoder control unit  622  according to AAC, and outputs PESs of 8 channels of AAC audio. Herein, the video compression technology is not limited to H.264, and the use of compression technology such as JPEG 2000, H.265, and VC-3 is also conceivable. Likewise, the audio compression technology is not limited to AAC, and the use of AC3, MPEG-2 Layer 1, and the like is also conceivable. 
         [0084]    In step  1006 , the MPEG-2 TS multiplexer  624  creates TS packets from the PES of H.264 compressed video and the PESs of 8 channels of AAC audio output from the encoder  623 , and produces a multiplexed MPEG-2 TS. 
         [0085]    In step  1007 , the signal conversion unit  625  IP packetizes the MPEG-2. TS output from the multiplexer  624  on the basis of the SMPTE 2022-2 specification by inserting the MPEG-2 TS into RTP payloads in units of 7 TS packets, and adding an RTP header, a UDP header, and an IP header. 
         [0086]    In step  1008 , the IP output interface unit  630  performs FEC computations on the IP stream output from the signal conversion unit  625 , and generates and adds FEC packets. Subsequently, a MAC header and an FCS are added to each IP packet, processing is conducted in the 1 Gbps Ethernet MAC sublayer to the each IP packet, and the IP packets are transmitted over the 1 Gbps Ethernet  652 . 
         [0087]    In step  1009 , the IP packet stream  608  of compressed video output from the IP uncompressed video encoder  600  is decoded in the IP decoder  920 , and output as an HD-SDI uncompressed video signal. 
         [0088]      FIG. 11  is a configuration diagram illustrating a video delivery system  1100  obtained by applying the IP uncompressed video encoder  600  illustrated in  FIG. 6  to the video delivery system of the related art illustrated in  FIG. 3  or  FIG. 4 . 
         [0089]    In  FIG. 11 , uncompressed video transmission devices  1112 - 1  to  1112 - 99  are installed in correspondence with respective cameras in multiple stadiums (in  FIG. 11 , the stadiums  11104  to  1110 - 10  as an example), and uncompressed video from each camera in the stadiums is converted into an IP packet stream conforming to SMPTE 2022-5/6, and sent to an IP network  1120  via 10 Gbps Ethernet. A broadcasting center  1130  selects required IP packet streams from the IP network  1120 , and inputs the selected IP packet streams into IP uncompressed video encoders  1132  to  1134 . The IP packet stream group of compressed video output from the IP uncompressed video encoders  1132  to  1134  is input into a video transmission unit  1131  via a 1 Gbps Ethernet, and after video processing, is sent externally. Note that in the embodiment of  FIG. 11 , the numbers indicated in the present embodiment with respect to the number of video equipment such as cameras, the 10 Gbps Ethernet, and the 1 Gbps Ethernet are merely examples, and the present invention is not limited to these numbers. 
         [0090]    In the system of  FIG. 11 , compared to the systems of  FIGS. 3 and 4 , an IP packetized uncompressed video signal may be transmitted directly to an IP uncompressed video encoder of the present invention, and an IP packet stream of compressed video may be generated. For this reason, by using an IP network as the transmission line and utilizing IP network routing and switching, it is possible to decrease the ratio of inactive equipment in a video delivery system, and without using a costly matrix switches, increase system flexibility and decrease costs for transmission line construction and the laying of cable. 
         [0091]    Another advantage obtained by using an IP uncompressed video encoder of the present invention is that by shifting the constraints on the system that had been imposed by using 1-to-1 coaxial cables of the related art to an Ethernet base with respect to video compression, it becomes possible construct a completely new form of broadcasting network. 
       Second Embodiment 
       [0092]      FIG. 12  is a configuration diagram illustrating an IP uncompressed video encoder according to a second embodiment of the present invention. The IP uncompressed video encoder  1200  illustrated in  FIG. 12  adds a switching function that selects the pathway of an IP stream to the IP uncompressed video encoder  600  of the first embodiment illustrated in  FIG. 6 . The IP uncompressed video encoder  1200  receives IP packet streams of uncompressed video in a packet format and FEC scheme conforming to SMPTE 2022-5/6 from 10 Gbps Ethernets  1251 - 1  to  1251 - 99 , and selects four IP packet streams. Subsequently, video data and audio data is retrieved from the selected four IP packet streams, and compressed to create IP packet streams of compressed video conforming to SMPTE 2022-1/2. After that, the created IP packet streams of compressed video are transmitted over networks selected from among 1 Gbps Ethernets  1254 - 1  to  1254 - 99 . 
         [0093]    The IP uncompressed video encoder  1200  illustrated in  FIG. 12  includes four IP encoder units  1200 - 1  to  1200 - 4 , as well as a receiving-side switch  1241  and a transmitting-side switch  1242  that select the pathway of an IP stream. Each switch of the receiving-side switch  1241  and the transmitting-side switch  1242  fulfills the role of a switch or router that selects the pathway of an IP stream, and selects a pathway by MAC address or IP address, for example. Switching or routing is conducted in Layer 2 or Layer 3 of the Open Systems Interconnection (OSI) reference model. The receiving-side switch  1241  has 10 Gbps Ethernets  1251 - 1  to  1251 - 99  as inputs, and has interfaces  1252 - 1  to  1252 - 4  to the IP encoder units as outputs. Between the inputs and the outputs, the receiving-side switch  1241  conducts packet switching in the MAC sublayer or the IP layer. Specifically, the receiving-side switch  1241  selects the interfaces  1252 - 1  to  1252 - 4  to the IP encoder units according to the MAC address, ULAN, or IP address of an IP stream to be encoded in an IP uncompressed video encoder. Subsequently, the IP stream to be encoded is forwarded to the selected interface, and input into an IP encoder unit. 
         [0094]    The IP encoder unit  1200 - 1  includes an IP input interface unit  1210  that receives an IP packet stream of uncompressed video, an encoder unit  1220  that compresses and encodes the received IP packet stream of uncompressed video, and an IP output interface unit  1230  that outputs the compressed IP packet stream. Note that the IP encoder units  1200 - 2  to  1200 - 4  have a similar configuration to the IP encoder unit  1200 - 1 . 
         [0095]    The IP input interface unit  1210  includes a  100  Ethernet packet processing unit  1211 , an ITC processing unit  1212 , and buffer memory  1213  for FEC control. 
         [0096]    The packet processing unit  1211  inspects an IP packet stream  1201  input from the interface  1252 - 1  in the MAC layer, the IP layer, the UDP layer, and the RTP layer, and forwards to the FEC processing unit  1212  only IP packets for which the MAC address and the IP address match the addresses of the IP stream to be encoded, and for which the FCS inspection, packet length inspection, and checksum inspection results are correct. 
         [0097]    The FEC processing unit  1212  writes IP packets from the packet processing unit  1211  into the buffer memory  1213  fir FEC control, and also controls the FEC matrix as the receiving side. If the FEC processing unit  1212  judges that the IP packets needed to construct a designated FEC matrix have all been written to the buffer memory  1213 , the FEC processing unit  1212  reads out data for the relevant FEC matrix from the buffer memory  1213 , and by performing FEC computations, reconstructs lost packets and conducts an error correction process. The error-corrected IP packets are sent by the FEC processing unit  1212  to the encoder unit  1220 . 
         [0098]    The encoder unit  1220  includes a signal extraction unit  1221  that retrieves an uncompressed video signal from IP packets input into the IP uncompressed video encoder, an encoder control unit  1222  that receives the retrieved uncompressed video signal, and outputs video data and audio data, an encoder  1223  that compresses and encodes the retrieved video data and audio data, an MPEG-2 TS multiplexer  1224 , and a signal conversion unit  1225  that IP packetizes the compressed video signal. 
         [0099]    The signal extraction unit  1221  inspects RTP sequence numbers in the IP packet stream from the FEC processing unit  1212  of the IP input interface unit  1210 , and for correct IP packets, removes the RTP, UDP, IP, and MAC headers, and extracts and forwards an uncompressed video signal  1202  to the encoder control unit  1222 . 
         [0100]    The encoder control unit  1222  extracts video data  1203  and audio data  1204 - 1  to  1204 - 8  from the uncompressed video signal  1202  input from the signal extraction unit  1221 , and forwards the extracted data to the encoder  1223 . 
         [0101]    The encoder  1223  includes a video encoder  1226  that compresses uncompressed video data according to H.264 coding, and an audio encoder  1227  that compresses 8 channels of audio data into AAC audio. 
         [0102]    The video encoder  1226  accepts the video data  1203  from the encoder control unit  1222 , and outputs a PES  1205  of H.264 compressed video. The audio encoder  1227  receives the audio data  1204 - 1  to  1204 - 8  from the encoder control unit  1222 , and outputs PESs  1206 - 1  to  1206 - 8  of compressed audio compressed with AAC. 
         [0103]    The MPEG-2 TS multiplexer  1224  receives the compressed video PES  1205  from the video encoder  1226  and the compressed audio PESs  1206 - 1  to  1206 - 8  from the audio encoder  1227 , creates TS packets, and produces a multiplexed MPEG-2 TS  1207 . 
         [0104]    The signal conversion unit  1225  IP packetizes the MPEG-2 TS  1207  on the basis of the SMPTE 2022-2 specification by inserting the MPEG-2 TS  1207  into RTP payloads in units of 7 TS packets, and adding an RTP header, a UDP header, and an IP header. 
         [0105]    The IP output interface unit  1230  includes an FEC processing unit  1232 , buffer memory  1233  for FEC control, and a 1 Gps Ethernet packet processing unit  1231 . The FEC processing unit  1232  writes IP packets from the signal conversion unit  1225  into the buffer memory  1233  for FEC control, and also controls the FEC matrix as the transmitting side. If the FEC processing unit  1232  judges that the IP packets needed to construct a designated FEC matrix have all been written to the buffer memory  1233 , the FEC processing unit  1232  reads out data for the relevant FEC matrix from the buffer memory  1233 , and by performing FEC computations, generates FEC packets. The FEC packets, as well as the IP packets from the signal conversion unit  1225 , are sent from the FEC processing unit  1232  to the packet processing unit  1231  in a designated order prescribed by SMPTE 2022-1. 
         [0106]    The packet processing unit  1231  attaches the MAC header and the FCS to the IP packets from the FEC processing unit  1232 , performs processing in the 1 Gbps Ethernet MAC sublayer, and forwards the IP packets as an IP packet stream  1208  to the transmitting-side switch  1242  via an interface  1253 - 1 . 
         [0107]    The transmitting-side switch  1242  has interfaces  1253 - 1  to  1253 - 4  from each of the IP encoder units  1200 - 1  to  1200 - 4  as inputs, and has 1 Gbps Ethernets  1254 - 1  to  1254 - 99  as outputs. Between these inputs and outputs, the transmitting-side switch  1242  conducts packet switching in the MAC sublayer or the IP layer. Specifically, the transmitting-side switch  1242  uses the MAC address, VLAN, or IP address to forward the IP packet stream  1208  to a 1 Gbps Ethernet for output from among  1254 - 1  to  1254 - 99 . It is possible to transmit the IP packet stream of compressed video that was encoded to an arbitrary network connected to the transmitting-side switch. 
         [0108]    Note that in the present embodiment, the receiving-side switch  1241  selects four packet streams, but this is merely one example, and in the present invention, the packet streams selected by the receiving-side switch  1241  are not limited to four. Similarly, the IP encoder units are also not limited to four. Further more, the 10 Gbps Ethernet and the 1 Gbps Ethernet are likewise not limited to the numbers described in the present example. This applies similarly to  FIG. 13  and thereafter. 
         [0109]      FIG. 13  is a configuration diagram illustrating a video transmission system  1300 , which is a video transmission system using the IP uncompressed video encoder  1200  illustrated in  FIG. 6 . The video transmission system  1300  includes cameras  1330 - 1  to  1330 - 99 , uncompressed video transmission devices  1310 - 1  to  1310 - 99  respectively connected to the cameras  1330 - 1  to  1330 - 99  by HD-SDI coaxial cables  1351 - 1  to  1351 - 99 , the IP uncompressed video encoder  1200  connected to the uncompressed video transmission devices  1310 - 1  to  1310 - 99  by 10 Gbps Ethernets  1251 - 1  to  1251 - 99 , IP decoders  1320 - 1  to  1320 - 99  connected to the IP uncompressed video encoder  1200  by 1G Ethernets  1254 - 1  to  1254 - 99 , and monitors  1340 - 1  to  1340 - 99  respectively connected to the IP decoders  1320 - 1  to  1320 - 99  by HD-SDI coaxial cables or HDMI cables  1352 - 1  to  1352 - 99 . 
         [0110]    The video transmission system  1300  is a system for viewing arbitrary video shot by one camera among the cameras  1330 - 1  to  1330 - 99  on an arbitrary monitor among the monitors  1340 - 1  to  1340 - 99 , and is able to forward the video from all cameras to all monitors. 
         [0111]    The uncompressed video transmission devices  1310 - 1  to  1310 - 99  are devices that respectively receive HD-SDI uncompressed video signals  1301 - 1  to  1 . 301 - 99  transmitted from the cameras  1330 - 1  to  1330 - 99  via the coaxial cables  1351 - 1  to  1351 - 99 , packetize the video signals in conformance with the FEC scheme and packet format of SMPTE 2022-5/6, and transmit the packets over the 10 Gbps Ethernets  1251 - 1  to  1251 - 99 . The IP decoders  1320 - 1  to  1320 - 99  are devices that respectively receive and decode IP packet streams conforming to the FEC scheme and packet format of SMPTE 2022-1/2 from the 1G Ethernets  1254 - 1  to  1254 - 99 , and output the HD-SDI or HDMI uncompressed video signals  1302 - 1  to  1302 - 99  via the coaxial cables or HDMI cables  1352 - 1  to  1352 - 99 . 
         [0112]    In the video transmission system  1300  of  FIG. 13 , for example, an IP packet stream  1201  of uncompressed video that has been IP packetized by the uncompressed video transmission device  1310 - 2  is input into the IP uncompressed video encoder  1200  via the 10 Gbps Ethernet  1251 - 2 , and converted into an IP packet stream  1208  of compressed video. The IP packet stream  1208  of compressed video is input from the IP uncompressed video encoder  1200  into the IP decoder  1320 - 3  via the 1 Gbps Ethernet  1254 - 3  selected by the transmitting-side switch  1242 . In the IP decoder  1320 - 3 , the IP packet stream of compressed video is decoded, output as an HD-SDI or HDMI uncompressed video signal  1302 - 3  via the coaxial cable or HDMI cable  1352 - 3 , and displayed on the monitor  1340 - 3 . 
         [0113]      FIG. 14  is a flowchart illustrating the sequential flow from the IP packetization of uncompressed video up to decoding an IP packet stream of compressed video and outputting to HD-SDI in the video transmission system  1300  of  FIG. 13 . 
         [0114]    In step  1401 , an HD-SDI video signal from the camera  1330 - 2  is, for example, IP packetized by the uncompressed video transmission device  1310 - 2  using the FEC scheme and packet format conforming to the SMPTE 2022-5/6 specification, and the IP packet. stream  1201  is transmitted over a 10 Gbps Ethernet. 
         [0115]    In step  1402 , the IP packet stream  1201  transmitted over the 10 Gbps Ethernet  1251 - 2  is input into the receiving-side switch  1241  of the IP uncompressed video encoder  1200 . If the IP encoder unit  1200 - 1  is selected as the pathway by the receiving-side switch  1241 , the IP packet stream  1201  is forwarded from the receiving-side switch interface  1252 - 1  to the IP input interface unit  1210 . 
         [0116]    In step  1403 , the IP packet stream  1201  undergoes checks in the IP layer, the UDP layer, and the RTP layer by the IP input interface unit  1210 . An FEC process is conducted only on error-free IP packets for which the MAC address and the IP address match addresses required by the IP uncompressed video encoder  1200 , whereas lost packets are recovered by error correction. A packet group including packets recovered by error correction is sent to the signal extraction unit  1221  of the encoder unit  1220 . 
         [0117]    In step  1404 , the signal extraction unit  1221  inspects RTP sequence numbers in the IP packet stream, and for correct IP packets, removes the RTP, UDP, IP, and MAC headers, and forwards the resulting uncompressed video signal to the encoder control unit  1222 . The encoder control unit  1222  extracts video data and 8-channel audio data from the uncompressed video signal from the signal extraction unit  1221 , and forwards the extracted data to the encoder  1223 . 
         [0118]    In step  1405 , the encoder  1223  compresses the video signal retrieved by the encoder control unit  1222  according to H.264 coding, and outputs a PES of H.264 compressed video. In addition, the encoder  1223  compresses the 8-channel audio signal retrieved by the encoder control unit  1222  according to AAC, and outputs PESs of 8 channels of AAC audio. 
         [0119]    In step  1406 , the MPEG-2 TS multiplexer  1224  creates TS packets from the PES of H.264 compressed video and the PESs of 8 channels of AAC audio output from the encoder  1223 , and produces a multiplexed MPEG-2 TS. 
         [0120]    In step  1407 , the signal conversion unit  1225  IP packetizes the MPEG-2. TS output from the multiplexer  1224  on the basis of the SMPTE 2022-2 specification by inserting the MPEG-2 TS into RTP payloads in units of 7 TS packets, and adding an RTP header, a UDP header, and an IP header. 
         [0121]    In step  1408 , the IP output interface unit  1230  performs FEC computations on the IF stream output from the signal conversion unit  1225 , and generates and adds FEC packets. Subsequently, a MAC header and an FCS are added to each IP packet, processing is conducted in the 1 Gbps Ethernet MAC sublayer, and the IP packets are forward to the transmitting-side switch interface  1253 - 1  as the IP packet stream  1208 . The transmitting-side switch selects the 1 Gbps Ethernet  1254 - 3 , for example, and forwards the IP packet stream  1208 . 
         [0122]    In step  1409 , the IP packet stream  1208  of compressed video output from the IP uncompressed video encoder  1200  is decoded by the IP decoder  1320 - 3 , output over the coaxial cable  1352 - 3  as an HD-SDI uncompressed video signal  1302 - 3 , and displayed on the monitor  1340 - 3 . 
         [0123]    The above description regarding  FIGS. 12, 13, and 14  is based on a configuration having both a receiving-side switch and a transmitting-side switch, but depending on the configuration of the network applying the present invention, application is also possible in which the network interface and the receiving means are joined directly without a receiving-side switch, or in which the transmitting means and the network interface are joined directly without a transmitting-side switch. 
         [0124]    Additionally, in the case of performing a specific implementation of the present invention, using an Ethernet switch supporting Layer 2 or Layer 3 enables the receiving-side switch and the transmitting-side switch to be realized by using the same single switch. 
         [0125]      FIG. 15  is a configuration diagram illustrating a video delivery system  1500  obtained by applying the IP uncompressed video encoder  1200  illustrated in  FIG. 12  to the video delivery system of the related art illustrated in  FIG. 3  or  FIG. 4 . 
         [0126]    In  FIG. 15 , uncompressed video transmission devices  1512 - 1  to  1512 - 99  are installed in correspondence with respective cameras in multiple stadiums  1510 - 1  to  1510 - 10 , and uncompressed video from each camera in the stadiums is converted into an IP packet stream conforming to SMPTE 2022-5/6, and input into the IP uncompressed video encoder  1522  via 10 Gbps Ethernet. In the IP uncompressed video encoder  1522 , video data and audio data are retrieved from the input IP packet streams, and compressed to create IP packet streams of compressed video conforming to SMPTE 2022-1/2, and transmitted over I Gbps Ethernet connected to a video transmission unit  1521  using a receiving-side switch or a transmitting-side switch. After video processing, the IP packet streams of compressed video input into the video transmission unit  1521  are sent to an external network. 
         [0127]    In the system of  FIG. 15 , the streams of IP packetized uncompressed video signals are transmitted directly to the IP uncompressed video encoder of the present invention, and the IP packet streams to be compressed may be selected by a receiving-side switch, while in addition, the transmission destination of the created IP packet streams of compressed video may be selected by a transmitting-side switch. Consequently, compared to the systems of  FIG. 3  and  FIG. 4 , it is possible to decrease the ratio of inactive equipment, and without using a costly matrix switcher, increase system flexibility and decrease costs for transmission line construction and the laying of cable. 
       Third Embodiment 
       [0128]      FIG. 16  is a configuration diagram illustrating an IP uncompressed video decoder according to a third embodiment of the present invention. The IP uncompressed video decoder  1600  illustrated in  FIG. 16  receives IP packet streams of uncompressed video in a packet format and FEC scheme conforming to SMPTE 2022-1/2 from 1 Gbps Ethernets  1651 - 1  to  1651 - 99 , and selects four IP packet streams. Subsequently, video data and audio data is retrieved from the selected four IP packet streams, and decoded to create IP packet streams of uncompressed video signals conforming to SMPTE 2022-516. After that, the created IP packet streams of uncompressed video are transmitted over networks selected from among 10 Gbps Ethernets  1654 - 1  to  1654 - 99 . 
         [0129]    The IP uncompressed video decoder  1600  illustrated in  FIG. 16  includes four IP units  1600 - 1  to  1600 - 4 , a receiving-side switch  1641 , and a transmitting-side switch  1642 . 
         [0130]    Each switch of the receiving-side switch  1641  and the transmitting-side switch  1642  fulfills the role of a switch or router that selects the pathway of an IP stream, and selects a pathway by MAC address or IP address, for example. Switching or routing is conducted in Layer 2 or Layer 3 of the OSI reference model. The receiving-side switch  1641  has  1 . Gbps Ethernets  1651 - 1  to  1651 - 99  as inputs, and has interfaces  1652 - 1  to  1652 - 4  to the IP decoder units as outputs. Between the inputs and the outputs, the receiving-side switch  1641  conducts packet switching in the MAC sublayer or the IP layer. Specifically, the receiving-side switch  1641  selects the interfaces  1652 - 1  to  1652 - 4  to the IP decoder units according to the MAC address, VLAN, or IP address of an IP stream to be decoded in an IP uncompressed video decoder. After that, the IP stream to be decoded is forwarded to the selected interface, and input into the IP decoder unit. 
         [0131]    The IP decoder unit  1600 - 1  includes an IP input interface unit  1610  that receives a compressed IP packet stream, an decoder unit  1620  that decodes the received IP packet stream of compressed video, and an IP output interface unit  1630  that outputs an IP packet stream of uncompressed video. 
         [0132]    The IP input interface unit  1610  includes a 1G Ethernet packet processing unit  1611 , an FEC processing unit  1612 , and buffer memory  1613  for FEC control. Note that the IP decoder units  1600 - 2  to  1600 - 4  have a similar configuration to the IP decoder unit  1600 - 1 . 
         [0133]    The packet processing unit  1611  inspects an IP packet stream  1601  input from the interface  1652 - 1  in the MAC layer, the IP layer, the UDP layer, and the RTP layer, and forwards to the FEC processing unit  1612  only IP packets for which the MAC address and the IP address match the addresses of the IP stream to be decoded, and for which the FCS inspection, packet length inspection, and checksum inspection results are correct. 
         [0134]    The FEC processing unit  1612  writes IP packets from the packet processing unit  1611  into the buffer memory  1613  tier FEC control, and also controls the FEC matrix as the receiving side. If the FEC processing unit  1612  judges that the IP packets needed to construct a designated FEC matrix have all been written to the buffer memory  1613 , the FEC processing unit  1612  reads out data for the relevant FEC matrix from the buffer memory  1613 , and by performing FEC computations, reconstructs lost packets and conducts an error correction process. The error-corrected IP packets are sent by the FEC processing unit  1612  to the decoder unit  1620 . 
         [0135]    The decoder unit  1620  includes a signal extraction unit  1621  that retrieves an MPEG-2 TS from the IP packets input into the IP uncompressed video decoder, a decoder control unit  1622  that receives the retrieved MPEG-2 TS, and outputs video data and audio data, a decoder  1623  that decodes the retrieved video data and audio data, an audio embedding unit  1624  that embeds the decoded audio data into the decoded uncompressed video signal, and a signal conversion unit  1625  that IP packetizes the uncompressed video signal output from the audio embedding unit  1624 . 
         [0136]    The signal extraction unit  1621  inspects RTP sequence numbers in the IP packet stream from the FEC processing unit  1612  of the IP input interface unit  1610 , and for correct IF packets, removes the RTP, EP, and MAC headers, and extracts and forwards an MPEG-2 TS  1602  to the decoder control unit  1622 . 
         [0137]    The decoder control unit  1622  extracts compressed video data  1603  and compressed audio data  1604 - 1  to  1604 - 8  from the MPEG-2 TS  1602  input from the signal extraction unit  1621 , and forwards the extracted data to the decoder  1623 . For the extraction of video data and audio data from the MPEG-2 TS  1602 , extraction is conducted by extracting data from designated fields on the basis of the ISO/IEC 13818-1 standard. Regarding the audio data, 8 channels are decoded in the present example. 
         [0138]    The decoder  1623  includes a video decoder  1626  that decodes compressed video that has been compressed according to H.264 coding, and an audio decoder  1627  that decodes 8 channels of audio data that has been compressed according to AAC. 
         [0139]    The video decoder  1626  receives the video data  1603  from the decoder control unit  1622 , performs H264 decoding on the video data  1603 , and outputs an uncompressed video signal  1605 . The audio decoder  1627  receives audio data  1604 - 1  to  1604 - 8  from the decoder control unit  1622 , and outputs decoded audio data  1606 - 1  to  1606 - 8 . 
         [0140]    The uncompressed video signal  1605  from the video decoder  1626  and the audio data  1606 - 1  to  1606 - 8  from the audio decoder  1627  are input into the audio embedding unit  1624 . The audio embedding unit  1624  embeds the audio data  1606 - 1  to  1606 - 8  into the uncompressed video signal  1605 , and produces an uncompressed video signal  1607  with embedded audio. The embedding of audio data into the 3G-SDI, HD-SDI, or SD-SDI uncompressed video signal  1605  is conducted on the basis of the SMPTE 424M, 292M, or 259M standard, respectively. 
         [0141]    The signal conversion unit  1625  IP packetizes the uncompressed video signal  1607  on the basis of the SMPTE 2022-6 specification by dividing the uncompressed video signal  1607  into units of fixed lengths, and adding an RTP header, a UDP header, and an IP header. 
         [0142]    The IP output interface unit  1630  includes an FEC processing unit  1632 , buffer memory  1633  for FEC control, and a 10 Gbps Ethernet packet processing unit  1631 . The FEC processing unit  1632  writes IP packets from the signal conversion unit  1625  into the buffer memory  1633  for FEC control, and also controls the FEC matrix as the transmitting side. If the FEC processing unit  1632  judges that the IP packets needed to construct a designated FEC matrix have all been written to the buffer memory  1633 , the FEC processing unit  1632  reads out data for the relevant FEC matrix from the buffer memory  1633 , and by performing FEC computations, generates FEC packets. The FEC packets, as well as the IP packets from the signal conversion unit  1625 , are sent from the FEC processing unit  1632  to the packet processing unit  1631  in a designated order prescribed by SMPTE 2022-5. 
         [0143]    The packet processing unit  1631  attaches the MAC header and the KS to the IP packets from the FEC processing unit  1632 , performs processing in the 10 Gbps Ethernet MAC sublayer, and forwards the IP packets as an IP packet stream  1608  to the transmitting-side switch  1642  via the interface  1653 - 1 . 
         [0144]    The transmitting-side switch  1642  has interfaces  1653 - 1  to  1653 - 4  with each of the IP decoder units  1600 - 1  to  1600 - 4  as inputs, and has 10 Gbps Ethernets  1654 - 1  to  1654 - 99  as outputs. Between these inputs and outputs, the transmitting-side switch  1642  conducts packet switching in the MAC sublayer or the IP layer. Specifically, the transmitting-side switch  1642  uses the MAC address, VLAN, or IP address to forward the IP packet stream  1608  to a 10 Gbps Ethernet for output from among  1654 - 1  to  1654 - 99 . It is possible to transmit the IP packet stream of uncompressed video that was decoded to an arbitrary network connected to the transmitting-side switch. 
         [0145]    Note that in the present embodiment, the receiving-side switch  1641  selects four packet streams, but this is merely one example, and in the present invention, the packet streams selected by the receiving-side switch  1641  are not limited to four. Similarly, the IP decoder units are also not limited to four. Furthermore, the 10 Gbps Ethernet and the 1 Gbps Ethernet are likewise not limited to the numbers described in the present embodiment. This applies similarly to  FIGS. 17 to 19 . 
         [0146]      FIG. 17  is a configuration diagram illustrating a video transmission system  1700 , which is a video transmission system using the IP uncompressed video decoder  1600  illustrated in  FIG. 16 . The video transmission system  1700  includes cameras  1730 - 1  to  1730 - 99 , video encoders  1710 - 1  to  1710 - 99  respectively connected to the cameras  1730 - 1  to  1730 - 99  by HD-SDI coaxial cables  1 . 751 - 1  to  1751 - 99 , the IP uncompressed video decoder  1600  connected to the video encoders  1710 - 1  to  1710 - 99  by Gbps Ethernets  1651 - 1  to  1651 - 99 , uncompressed IP video reception devices  1720 - 1  to  1720 - 99  connected to the IP uncompressed video decoder  1600  by 10G Ethernets  1654 - 1  to  1654 - 99 , and monitors  1740 - 1  to  1740 - 99  respectively connected. to the uncompressed W video reception devices  1720 - 1  to  1720 - 99  by HD-SDI coaxial cables or HDMI cables  1752 - 1  to  1752 - 99 . 
         [0147]    The video transmission system  1700  is a system for viewing arbitrary video shot by one camera among the cameras  1730 - 1  to  1730 - 99  on an arbitrary monitor among the monitors  1740 - 1  to  1740 - 99 , and is able to forward the video from all cameras to all monitors. 
         [0148]    The video encoders  1710 - 1  to  1710 - 99  accept HD-SDI uncompressed video signals  1701 - 1  to  1701 - 99  from the cameras  1730 - 1  to  1730 - 99  via respective coaxial cables  1751 - 1  to  1751 - 99  as input. The HD-SDI uncompressed video signals  1701 - 1  to  1701 - 99  input into the video encoders  1710 - 1  to  1710 - 99  are encoded according to H.264 coding, and transmitted over 1 Gbps Ethernets  1651 - 1  to  1651 - 99  as IP packet streams conforming to the FEC scheme and packet format of SMPTE 2022-10. 
         [0149]    The uncompressed IP video reception devices  1720 - 1  to  1720 - 99  receive IP packet streams confirming to the FEC scheme and packet format of SMPTE 2022-5/6 from the 10G Ethernets  1654 - 1  to  1654 - 99 , extract uncompressed video signals, and output HD-SDI or HDMI uncompressed video signals  1702 - 1  to  1702 - 99 . 
         [0150]    In the video transmission system  1700  of  FIG. 17 , for example, a stream  1601  that has been compressed and IP packetized by the video encoder  1710 - 2  is input to the IP uncompressed video decoder  1600  via the 1 Gbps Ethernet  1651 - 2 , and converted into an IP packet stream  1608  of uncompressed video. The IF packet stream  1608  of uncompressed video is input from the IP uncompressed video decoder  1600  into the uncompressed IP video reception device  1720 - 3  via the 10 Gbp Ethernet  1654 - 3  selected by the transmitting-side switch  1642 . In the uncompressed IP video reception device  1720 - 3 , an uncompressed video signal is extracted from the IP packet stream of uncompressed video, output as an HD-SDI uncompressed video signal  1702 - 3  via the coaxial cable  1752 - 3 , and displayed on the monitor  1740 - 3 . 
         [0151]      FIG. 18  is a flowchart from creation of an IP packet stream of compressed video From uncompressed video up to outputting of an H-SDI signal on the receiving side in the video transmission system  1700  of  FIG. 17 . 
         [0152]    In step  1801 , an HD-SDI video signal from the camera  1730 - 2  is, for example, encoded using H.264 coding by the video encoder  1710 - 2 , IP packetized using the FEC scheme and packet format conforming to the SMPTE 2022-1/2 specification, and the IP packet stream  1601  is transmitted over the 1 Gbps Ethernet  1651 - 2 . 
         [0153]    In step  1802 , the IP packet stream  1601  transmitted over the 1 Gbps Ethernet  1651 - 2  is input into the receiving-side switch  1641  of the IP uncompressed video decoder  1600 , and forwarded by the receiving-side switch  1641  to the IP input interface unit  1610  of the IP decoder unit  1600 - 1 , for example. 
         [0154]    In step  1803 , the IP packet stream  1601  undergoes checks in the IP layer, the UDP layer, and the RTP layer by the IP input interface unit  1610 . An FEC process is conducted only on error-free IP packets for which the MAC address and the IP address match addresses required by the IP uncompressed video decoder  1600 , whereas lost packets are recovered by error correction. A packet group including packets recovered by error correction is sent to the signal extraction unit  1621  of the decoder unit  1620 . 
         [0155]    In step  1804 , the signal extraction unit  1621  inspects RTP sequence numbers in the IP packet stream, and for correct IP packets, removes the RTP, UDP, IP, and MAC headers, and extracts and forwards an MPEG-2 TS to the decoder control unit  1622 , The decoder control unit  1622  extracts video data and 8-channel audio data from the MPEG-2 TS from the signal extraction unit  1621 , and forwards the extracted data to the decoder  1623 . 
         [0156]    In step  1805 , the decoder  1623  decodes the video data retrieved by the decoder control unit  1622  according to H.264 coding, and outputs an uncompressed video signal. In addition, the decoder  1623  decodes the 8-channel audio signal according to AAC, and outputs 8 channels of decoded audio data. 
         [0157]    In step  1806 , the audio embedding unit  1624  embeds the 8 channels of audio data output from the decoder  1623  into the uncompressed video signal also output from the decoder  1623 , and products an uncompressed video signal with embedded audio. 
         [0158]    In step  1807 , the signal conversion unit  1625  IP packetizes the uncompressed video signal output from the audio embedding unit  1624  on the basis of the SMPTE 2022-6 specification by dividing the uncompressed video signal into units of fixed length, inserting the divided uncompressed video signal into RTP payloads, and adding an RTP header, a UDP header, and an IP header. 
         [0159]    In step  1808 , the IP output interface unit  1630  performs FEC computations on the IP packet stream output from the signal conversion unit  1625 , and generates and adds FEC packets. Subsequently, a MAC header and an FCS are added to each IP packet, processing is conducted in the 10 Gbps Ethernet MAC sublayer, and the IP packets are forward to the transmitting-side switch interface  1653 - 1  as the IP packet stream  1608 . The transmitting-side switch selects the 10 Gbps Ethernet  1654 - 3 , for example, and forwards the IP packet stream. 
         [0160]    In step  1809 , the uncompressed video reception device  1720 - 3  extracts an uncompressed video signal from the IP packet stream  1608  of uncompressed video output by the IP uncompressed video decoder  1600 , and outputs over the coaxial cable  1752 - 3 . The HD-SDI uncompressed video signal  1702 - 3  output over the coaxial cable  1752 - 3  is displayed on the monitor  1740 - 3 . 
         [0161]    The above description regarding  FIGS. 16, 17, and 18  is based on a configuration having both a receiving-side switch and a transmitting-side switch, but depending on the configuration of the network applying the present invention, application is also possible in which the network interface and the receiving means are joined directly without a receiving-side switch, or in which the transmitting means and the network interface are joined directly without a transmitting-side switch. Additionally, in the ease of performing a specific implementation of the present invention, using an Ethernet switch supporting Layer 2 or Layer 3 enables the receiving-side switch and the transmitting-side switch to be realized by using the same single switch. 
         [0162]      FIG. 19  is a configuration diagram illustrating a video transmission system  1900  which, unlike a coaxial cable-based system of the related art, is designed to be used on an IP network, and applies the IP uncompressed video decoder  1600  of the present embodiment to the broadcasting system of  FIG. 5 . 
         [0163]    In  FIG. 19 , video encoders  1912 - 1  to  1912 - 99  are installed in correspondence with respective cameras  1911 - 1  to  1911 - 99  in multiple stadiums  1910 - 1  to  1910 - 10 , and uncompressed video from each camera in the stadiums is converted into an IP packet stream conforming to SMPTE 2022-1/2, and input into an IP uncompressed video decoder  1921  via a 1 Gbps Ethernet. IP packet streams from broadcasting stations  1931  and  1932  are also similarly input into the IP uncompressed video decoder  1921 . In. the IP uncompressed video decoder  1921 , video data and audio data are retrieved from the input IP packet streams, decoded to create IP packet streams of uncompressed video conforming to SMPTE 2022-5/6, and transmitted over a 10 Gbps Ethernet connected to a monitor group  1922 , an editing system  1923 , a transmission system  1924 , and the like using a receiving-side switch or a transmitting-side switch. 
         [0164]    In the system of  FIG. 19 , the IP packet streams of IP packetized, compressed video are transmitted directly to the IP uncompressed video decoder of the present invention, and the IP packet streams to be decoded may be selected by a receiving-side switch, while in addition, the transmission destination of the created IP packet streams of uncompressed video as a result of decoding may be selected by a transmitting-side switch. Consequently, compared to the system of  FIG. 5 , it is possible to decrease the ratio of inactive equipment, and without using a costly matrix switcher, increase system flexibility and decrease costs for the laying of cable. 
       INDUSTRIAL APPLICABILITY 
       [0165]    The present invention may be used in a system that handles multiple video data streams, such as a video transmission system for sports events, a video delivery system inside a broadcasting station, or the like.
     100 ,  322 - 1  to  322 - 99 ,  422 - 1 ,  422 - 2 ,  512 - 1  to  512 - 99  Video encoder     200 ,  522 - 1  to  522 - 101  Video decoder     101  HD-SDI input interface     207  HD-SDI output interface     300 ,  400 ,  500 ,  1100 ,  1500 ,  1900  Video delivery system     310 - 1  to  310 - 10 ,  410 - 1  to  410 - 10 ,  510 - 1  to  510 - 10 ,  1110 - 1  to  1110 - 10 ,  1510 - 1  to     1510 - 10 ,  1910 - 1  to  1910 - 10  Arena     311 - 1  to  311 - 99 ,  411 - 1  to  411 - 99 ,  511 - 1  to  511 - 99 ,  930 ,  1111 - 1  to  1111 - 99 ,  1330 - 1  to     1330 - 99 ,  1511 - 1  to  1511 - 99 ,  1730 - 1  to  1730 - 99 ,  1911 - 1  to  1911 - 99  Camera     312 - 1  to  312 - 99 ,  412 - 1  to  412 - 99  E/O converter     320 ,  320 ,  520 ,  1130 ,  1520 ,  1920  Broadcasting center     321 - 1  to  321 - 99 ,  421 - 1  to  421 - 99  O/E converter     323 ,  423 ,  1131 ,  1521  Video transmission unit     424 ,  521  Matrix switcher     523 ,  1 . 922  Monitor group     524 ,  1923  Editing system     525 ,  1924  Transmission system     531 ,  532 ,  1931 ,  1932  Broadcasting station     600 ,  1132  to  1134 ,  1200 ,  1522  IP uncompressed video encoder     120 ,  210 ,  601 ,  608 ,  1201 ,  1208 ,  1601 ,  1608 IP packet stream     602 ,  1202 ,  1607  Uncompressed video signal     603 ,  1203 ,  1605  Video data     604 - 1  to  604 - 8 ,  1204 - 1  to  1204 - 8 ,  1606 - 1  to  1606 - 8  Audio data     605 ,  1205 ,  1603  Compressed video PES     606 - 1  to  606 - 8 ,  1206 - 1  to  1206 - 8 ,  1604 - 1  to  1604 - 8  Compressed audio PES     607 ,  1207 ,  1602  MPEG-2 TS     201 ,  610 ,  1210 ,  1610  IP input interface unit     611 ,  1211 ,  1611  Packet processing unit     612 ,  1212 ,  1612  FEC processing unit     613 ,  1213 ,  1613  Buffer memory for FEC control     620 ,  1220  Encoder unit     202 ,  621 ,  1221 ,  1621  Signal extraction unit     102 ,  622 ,  1222  Encoder control unit     623 ,  1223  Encoder     105 ,  624 ,  1224  MPEG-2 TS multiplexer     106 ,  625 ,  1225 ,  1625  Signal conversion unit     103 ,  626 ,  1226  Video encoder     104 ,  627 ,  1227  Audio encoder     107 ,  630 ,  1230 ,  1630  IP output interface unit     631 ,  1231 ,  1631  Packet processing unit     632 ,  1232 ,  1632  FEC processing unit     633 ,  1233 ,  1633  Buffer memory for FEC control     651 ,  1251 - 1  to  1251 - 99 ,  1654 - 1  to  1654 - 99  10 Gbps Ethernet     121 ,  211 ,  652 ,  1254 - 1  to  1254 - 99 ,  1651 - 1  to  1651 - 99  1 Gbps Ethernet     900 ,  1300 ,  1700  Video transmission system     901 ,  902 ,  1301 - 1  to  1301 - 99 ,  1302 - 1  to  1302 - 99 ,  110 ,  220 ,  1701 - 1  to  1701 - 99 ,  1702 - 1  to  1702 - 99  HD-SDI video signal     903  HDMI video signal     910 ,  1112 - 1  to  1112 - 99 ,  1310 - 1  to  1310 - 99  Uncompressed video transmission device     920 ,  1320 - 1  to  1320 - 99  IP decoder     951 ,  952 ,  1351 - 1  to  1351 - 99 ,  1352 - 1  to  1352 - 99 ,  111 ,  1751 - 1  to  1751 - 99 ,  1752 - 1  to     1752 - 99  Coaxial cable     953  HDMI cable     1120  IP network     1241 ,  1641  Receiving-side switch     1242 ,  1642  Transmitting-side switch     1200 - 1  to  1200 - 4 IP encoder unit     1252 - 1  to  1252 - 4 ,  1652 - 1  to  1652 - 4  Receiving-side switch interface     1253 - 1  to  1253 - 4 ,  1653 - 1  to  1653 - 4  Transmitting-side switch interface     1240 - 1  to  1240 - 99 ,  1740 - 1  to  1740 - 99  Monitor     1600 ,  1921  IP uncompressed video decoder     1600 - 1  to  1600 - 99  IP decoder unit     203 ,  1622  Decoder control unit     1623  Decoder     206 ,  1624  Audio embedding unit     204 ,  1626  Video decoder     205 ,  1627  Audio decoder     1710 - 1  to  1710 - 99 ,  1912 - 1  to  1912 - 99  IP encoder     1720 - 1  to  1720 - 99 ,  1925 - 1  to  1925 - 6  Uncompressed IP video reception device