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The problem of multimedia communications over best-effort networks is addressed herewith multiple description coding (MDC) in a distributed framework. In this paper, wefirst compare four video MDC schemes based on different time splitting patterns and temporaltwo- or three-band motion-compensated temporal filtering (MCTF). Then, the latter schemes are extendedwith systematic lossy description coding where the original sequence is separated into twosubsequences, one being coded as in the latter schemes, and the other being coded with aWyner-Ziv (WZ) encoder. This amounts to having a systematic lossy Wyner-Ziv coding of every otherframe of each description. This error control approach can be used as an alternative to automaticrepeat request (ARQ) or forward error correction (FEC), that is, the additional bitstream can besystematically sent to the decoder or can be requested, as in ARQ. When used as an FEC mechanism, theamount of redundancy is mostly controlled by the quantization of the Wyner-Ziv data. In this context,this approach leads to satisfactory rate-distortion performance at the side decoders, however it suffersfrom high redundancy which penalizes the central description. To cope with this problem, theapproach is then extended to the use of MCTF for the Wyner-Ziv frames, in which case only thelow-frequency subbands are WZ-coded and sent in the descriptions

Distributed Temporal Multiple Description Coding for Robust Video Transmission