Method and system for recovering lost media data packet

Abstract

The invention discloses a method for recovering a lost media data packet. A stream media server sends and caches media data stream; a client-side receives and caches the media data stream; when the client-side detects that the cached media data stream internally loses a media data packet, the client-side sends a renunciative massage to the stream media server, wherein the renunciative massage carries packet lost information of the media data stream; the stream media server sets forward error correction coding redundancy according to the packet lost information of the media data stream and obtains a media data packet to be recovered from the media data stream cached by the stream media server; the stream media server encodes the media data packet to be recovered into forward error correction data to be sent the client-side according to the forward error correction coding redundancy; and the client-side recovers the lost media data packet according to the forward error correction data and the media data stream cached by the client-side. The invention also discloses a system for recovering the lost media data packet. By adopting the method, network bandwidth can be saved, and the CPU load of the stream media server can be reduced.

Description

technical field [0001] The invention relates to packet loss recovery technology in the field of Internet Protocol Television (IPTV), in particular to a method and system for recovery of media data packet loss. Background technique [0002] In the IPTV service, the transmission quality of the media data packets from the streaming media server to the client directly affects the user's video viewing effect. If the media data packet is lost during the transmission process, the video picture will be paused or mosaic, which seriously affects the user experience. Therefore, how to ensure the transmission quality of media data packets to provide users with high-quality video viewing effects is a key technical problem faced by the IPTV field. [0003] The traditional transmission control protocol (TCP) transmission method provides automatic packet loss retransmission function, but its packet loss retransmission mechanism is essential, that is, if a packet is lost, the entire transmi...

AI Technical Summary

Problems solved by technology

Using the retransmission technology brings limited overhead because only the lost media packets are retransmitted; however, the associated delay is relatively large: the more packets lost, the greater the delay, so it is possible that although the media packets are retransmitted The case where the transfer is complete but outdated

Using FEC technology, the streaming media server continuously sends FEC data while sending the media data stream, and the client can reconstruct the lost media data packets according to the FEC data, and the real-time performance is relatively good; however, continuously sending FEC data will bring fixed bandwidth Consumption, especially in the case of relatively good network conditions, although there is no packet loss or the probability of packet loss is small, there will still be fixed bandwidth consumption

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