Patent ID: 7746904

Claim:
An audio/video processing main unit which conducts audio processing and video processing, the audio/video processing main unit comprising: a receiving unit receiving an AV stream including video and audio, from an external device via a communication network; a demux unit separating the AV stream into a video stream including the video and an audio stream including the audio; a video processing unit processing the video stream so as to generate a video signal; an audio acquisition unit acquiring an audio stream including at least a part of the audio, from the AV stream supplied to the receiving unit; a transmitting for unit transmitting the audio stream acquired by the audio acquisition unit, to at least one external device via the communication network; a stream buffer which temporarily stores the AV stream supplied to the receiving unit; an AV clock unit indicating a time for determining a timing to output the AV stream; an AV clock adjusting unit adjusting the AV clock unit in such a manner as to cause the AV clock unit to be in synchronization with the AV stream; and a comparing unit supplying at least a part of the AV stream to the demux unit, in case where an AV stream output time of the AV stream is equal to or later than the time indicated by the AV clock unit, the AV stream including information of the AV stream output time.