Best packetisation scheme for H.263 internet video communication

Abstract

The H.263 codec is an efficient way to stream variable bit-rate video sequences. This letter proposes that, for equivalent bandwidth and frame rate, a two-slice packetization scheme results in superior peak signal-to-noise ratio, rather than the conventional oneslice scheme, and that constant inter-packet gap rather than 'bursty' delivery is preferable. Introduction: Studies of packetization schemes for the H.263+ video codec, for example [1], tend to assume the one slice per packet recommendation contained in RFC 2429 section 3.2 [2], whereas in this letter a two-slice scheme is proposed. In [3], the burst length is identified (for H.264) as a source of peak signal-to-noise ratio (PSNR) degradation, as much as the average packet loss rate. In this letter, the method of delivery, either per frame bursts, or uniform (constant) inter-packet gap (IPG) is shown to

Measurement study of packet loss versus delay in congestion detection for video streaming

“…Every Common Intermediate Format (CIF) frame was split into 18 macroblock row-wise slices (using H.263+'s slice mode rather than GOBs) for error resilience and then transported by allocating two slices per packet. In [9] it was established that 2-slices per packet is more efficient in these scenarios than a recommended 1-slice per packet scheme. The interpacket gap (IPG) between sending packets was set to a constant value.…”

Measurement and Analysis Study of Congestion Detection for Internet Video Streaming

“…Every Common Intermediate Format (CIF) frame was split into 18 macro-block row-wise slices (using H.263+'s slice mode rather than GOBs) for error resilience and then λ λ λ λ transported by allocating two slices per packet. In [31] it was established that 2-slices per packet is more efficient in these scenarios than the 1-slice per packet scheme normally recommended [32]. The inter-packet gap between sending packets was set to a constant value, 3.7 ms, to reflect the frame rate.…”

Router response to traffic at a bottleneck link

“…Optimal packetization schemes are of great interest [1] to the designers of video streaming applications. As video and audio packets are often closely spaced, loss correlation is a more serious problem for video streaming than for other applications [2], for which losses may appear as essentially random [3].…”