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Multiple Description of Coded Video for Path Diversity Streaming
Adaptation
Abstract
This paper extends the current concept of multiple description coding
(MDC) to the compressed domain, by proposing efficient splitting of standard
single description coded (SDC) video into a multi-stream representation. A novel
multiple description video splitting (MDVS) scheme is proposed to operate at
network edges, for increased robustness in path diversity video streaming across
heterogeneous communications chains. It is shown that poor performance of
existing methods is mainly due to distortion accumulation, i.e., drift, when
decoding is carried out with missing descriptions. The proposed scheme is able to
effectively control drift distortion in both intra and inter predictive coding, even
when only one description reaches the decoder. This is achieved by generating a
controlled amount of relevant side information to compensate for drift
accumulation, whenever any description is lost in its path. The simulation results
show that any individual description can be decoded on its own without producing
drift, achieving significant quality improvement at reduced redundancy cost. The
overall performance evaluation, carried out by simulating video streaming over
lossy networks with path diversity, also demonstrates that MDVS enables higher
quality video in such heterogeneous networking environments, for a wide range of
packet loss rates.
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