WOWMOM '06 Proceedings of the 2006 International Symposium on on World of Wireless, Mobile and Multimedia Networks
Leveraging the quantization offset for improved requantization transcoding of H.264/AVC video
PCS'09 Proceedings of the 27th conference on Picture Coding Symposium
Architectures for fast transcoding of H.264/AVC to quality-scalable SVC streams
IEEE Transactions on Multimedia
Transcoding of H.264/AVC to SVC with motion data refinement
ICIP'09 Proceedings of the 16th IEEE international conference on Image processing
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We analyze the problem of optimal data partitioning of MPEG-2 coded video in an operational rate-distortion context. The optimal algorithm is characterized and shown to have high complexity and delay. A causally optimal algorithm based on Lagrangian optimization is proposed, that optimally solves the problem for intra (I) pictures, and provides an optimal solution for predicted/interpolated (P/B) pictures when the additional constraints of causal operation and/or low-delay are imposed. A memoryless version of the algorithm, theoretically optimal for intrapictures only, is shown to perform almost identically but with significantly less computational complexity. Finally, a fast, suboptimal algorithm using purely rate-based optimization is also proposed, and is shown to perform quite close (within 1 dB) to the causally optimal one. Experimental results are provided using actual MPEG-2 coded video bitstreams.