Y.-L. Chan, H.-K. Cheung, and W.-C. Siu (PRC)
Error-resilient transcoding, compressed-domain processing, video coding, streaming video.
Many error-resilient video coding schemes that protect compressed video data against transmission errors have been proposed in the literature. One of the well-known schemes is reference picture selection (RPS). So far, various RPS techniques have been investigated widely for use in real-time encoding. However, the RPS has not been examined in transmitting an already encoded MPEG bitstream. One simple approach in adopting the RPS scheme in an already MPEG encoded bitstream is to decode all the P-frames from the previously nearest I frame to the current transmitted frame which is then re-encoded by using a new reference. This straightforward approach induces a huge amount of complexity in the video transcoder and introduces re-encoding errors. Thus, in this paper, some compressed-domain algorithms are proposed to mitigate the trancoding complexity when RPS is adopted in an already MPEG encoded bitstream. According to the types of blocks, different novel techniques are operated on the blocks in the compressed domain. The transcoder then sends the processed blocks to the client machine. Experimental results show that the proposed transcoder can reduce the transcoding complexity with maintaining high quality of reconstructed video.
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