Abstract
Video transmission through wireless channels is still a challenging problem on the limitations in bandwidth and the presence of channel errors. Video transcoding, due to its high practical values for a wide range of networked video applications, has become an active research topic. It is typically used to reduce the rate and change the format of the originally encoded video source to match network conditions and terminal capabilities. Error resilient video transcoding can insert error resilient tools in the compressed video to enhance error resilience of the video over wireless channels by increasing bit rate. In this paper, firstly we outline the technical issues and research results related to video transcoding, Then we discuss techniques for reducing the complexity and improving the video quality, such as intra marcoblock refresh, synchronization marker insertion, error concealment, joint optimization, redundant slices, unequal error protection, and so on. To achieve good resilient performance, a experimental video transcoding is designed and established. The results show its improved video quality at the reducing the complexity and the cost of bit rate.
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