Patent ID: 7400678
Filing Date: 2008-07-15
Classification: H04L,H04N

Abstract:
1. A method in transmission on request of video information in a shared network resource, wherein the shared network resource particularly is Internet, an intranet or extranet, wherein the video information is stored in the form of an encoded video file on HTTP servers in the shared network resource and accessed by clients via HTTP (Hypertext Transfer Protocol), wherein each client has a video decoder, and wherein the initial video information is in the form of digitized video signals, characterized by comprising steps for generating by means of a video encoder y multiple encoded video streams (VS) which each comprises the video signals of the initial video information compressed with average bit rates t[c] which covers the clients' expected channel bit rates σ, the video encoder generating independently decodable video frames at given time intervals; generating y encoded intermediate streams (IS) from the corresponding encoded video streams (VS) by dividing an encoded video stream in p packets (PC) with varying lengths q, each packet (PC) comprising a header (H providing the header (H (i) the distances d (ii) the number n of video frames (F) that the packet comprises, and (iii) a reference to the corresponding packet in respectively the encoded intermediate stream (IS providing an independently decodable video frame (IF) at the beginning of the payload (PL) of a packet (PC); concatenating the intermediate streams (IS) into a final file (Φ) which is stored on one or more HTTP servers; and providing the final file (Φ) with a header (H generating a request for the header (HΦ) and the beginning of the first stream (IS estimating the channel bit rate σ and selecting the stream (IS switching to the stream (IS switching to the stream (IS