Using the Draft H.26l Video Coding Standard for Mobile Applications

The mai n goals of the new ITU -T H.26L standardization effort are enhanced compression performance and provision of a “network-friendly” packet -based video representation addressing “conversational” (i.e., video telephony) and “non conversational” (i.e., storage, broadcast, or streaming) applications. Hence, the H.26L design covers a Video Coding Layer (VCL), which provides the core high -compression representation of the video picture content, and a Network Adaptation Layer (NAL), which packages that representation for delivery over a particular type of network. The H.26L VCL test model has achieved a significant improvement in rate -distortion efficiency – providing nearly a factor of two in bit -rate savings when comparing against the H.263+ test model. NAL designs are being developed to transport the coded video data over existing and future networks such as circuit -switched wired networks, IP networks with RTP packetization, and 3G wireless systems. The NAL is also designed to enable simple gateway operation in heterogeneous transmission scenarios.