Live media synchronization quality of a retransmission-based error recovery scheme

This paper proposes a transport-layer error recovery scheme using retransmission for live audio-video streams transferred over QoS non-guaranteed networks. The scheme employs an enhanced version of the virtual-time rendering (VTR) media synchronization algorithm, which adjusts media rendering-time according to the network condition and is referred to as RVTR (retransmission with VTR). By an experiment, we assess the synchronization quality of both intra-stream and inter-stream in RVTR and four other schemes for audio-video transmission. A comparison of the experimental results indicates that joint application of retransmission control and the VTR synchronization control as in RVTR is effective in the improvement of media synchronization quality and that either control alone does not produce much improvement