Abstract: Information of coded video streams is always used by video transcoders to improve the efficiency. This paper suggests a MPEG-2 to H.264 video transcoder. The motion estimation difference between MPEG-2 and H.264 is analyzed and several Motion Vector(MV) refine algorithms are proposed to improve the transcoding quality. Using the suggested MV refine algorithms, the transcoder can generate high quality H.264 videos with low complexity.

Key words: MPEG-2, H.264, transcoding, Motion Vector(MV)

摘要： 在视频转换编码技术中，通常利用输入码流中的运动矢量等信息来降低转码处理的计算量。该文介绍一种MPEG-2到H.264的转码器，针对MPEG-2和H.264标准中运动估计算法的不同特点，提出用于转码处理的运动矢量优化算法，并对不同算法进行分析比较。结果表明该优化算法可以在保证转码质量的前提下，降低转码处理的计算量。

关键词: MPEG-2标准, H.264标准, 转码, 运动矢量

CLC Number: 

• TN919.81