Optimization of H264 for low delay video communications over lossy channels

Abstract

In this paper, we study the data partitioning (DP) and its optimization for H264 video coding standard. H264 does not include DP in baseline profile, which is the most suitable profile for low delay, low complexity, and loss prone environments. To analyze the optimization of DP, we first introduce the concept of subchannels to abstract the physical layer. This allows us to move channel coding from application layer to physical layer. Then, we build the video encoder system around NEWPRED[1] so that error propagation and its analysis is eliminated. Finally, we provide macroblock and slice level optimizations that result in optimal mode decisions and Unequal Error Protection (UEP) rates for data partitions. Experimental results show about 0.5dB performance increase compared to no data partitioning.