Reference picture selection in an already MPEG encoded bitstream
Hoi-Kin Cheung, Yui‐Lam Chan, Wan-Chi Siu · 2005
Reference picture selection (RPS) is the most common error resilience method for robust transmission over lossy networks. However, RPS has been studied for use in real-time encoding, but has not been examined in transmitting an already encoded MPEG bitstream. In this paper, we propose a compressed-domain approach for the efficient implementation of RPS in the pre-encoded MPEG bitstream with minimum requirement on the server complexity. In the proposed algorithm, a novel macroblock-based algorithm is used to adaptively select the necessary macroblocks, manipulate them in compressed-domain and send the processed macroblocks to the receiver. Experimental results show that, as compared to the original RPS, the new algorithm reduces the required server complexity significantly.