本文讲述多媒体转码从H.263到新一代视频编码标准H.264的异构网络转码的新算法研究-In this paper, we investigate and propose efficient methods

for transcoding H.263 video to H.264/AVC standard

by exploiting the new coding features. Specifically, the proposed

methods aim to reduce the computational complexity

while maintaining acceptable video quality for syntax

transcoding and 2 : 1 downsizing transcoding from H.263

to H.264/AVC standard. In a nutshell, the proposed methods

include three components, namely fast intraprediction mode

selection, motion vector reestimation and intermode selection,

and enhanced rate control for H.264AVC transcoding.

The first two components focus on the most computationally

intensive parts of the H.264/AVC standard to speed up

the transcoding process, while the third component aims to

achieve a better video quality by enhancing the rate control

with the side information extracted fromthe precoded video.

The experimental results show that the proposed methods

can reduce the total encoding time by a factor of 6 and suffer

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