This paper proposes an algorithm for the robust transmission of video in error prone environment using hybrid multiple description coding (Hybrid MDC) scheme. Multiple description coding (MDC) is more resilient than single description coding (SDC) against severe packet loss rate (PLR) condition. But the excessive redundancy in the MDC degrades the performance in the case of lower PLR. To overcome this problem of MDC, we propose a hybrid MDC method that can switch between SD and MD according to the channel condition. Specifically, the encoder selects SDC for the coding efficiency at low PLR and MDC for the error resilience at high PLR. For the optimal switching of SD/MD the rate-distortion optimization framework is used in this paper. The recursive optimal per-pixel estimate (ROPE) technique is adopted to estimate the accurate decoder distortion at the time of encoding. Experimental results show that proposed Hybrid MDC with SD/MD switching algorithm is more effective than conventional MDC algorithms at low PLR as well as at high PLR.
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