Content-Based Complexity Reduction Methods for MPEG-2 to H.264 Transcoding

Shen LI
Lingfeng LI
Masataka MATSUI
Satoshi GOTO

IEICE TRANSACTIONS on Information and Systems   Vol.E90-D    No.1    pp.90-98
Publication Date: 2007/01/01
Online ISSN: 1745-1361
Print ISSN: 0916-8532
Type of Manuscript: Special Section PAPER (Special Section on Advanced Image Technology)
MPEG-2/H.264 video transcoding,  content-based,  mode decision,  intra prediction,  

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The coexistence of MPEG-2 and its powerful successor H.264/AVC has created a huge need for MPEG-2/H.264 video transcoding. However, a traditional transcoder where an MPEG-2 decoder is simply cascaded to an H.264 encoder requires huge computational power due to the adoption of a complicated rate-distortion based mode decision process in H.264. This paper proposes a 2-D Sobel filter based motion vector domain method and a DCT domain method to measure macroblock complexity and realize content-based H.264 candidate mode decision. A new local edge based fast INTRA prediction mode decision method is also adopted to boost the encoding efficiency. Simulation results confirm that with the proposed methods the computational burden of a traditional transcoder can be reduced by 20%30% with only a negligible bit-rate increase for a wide range of video sequences.

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