具体的转换方式有三种：码率转换、分辨率转换、语法转换。
Video Transcoding have three means: code rate transformation, resolution transformation, transformation between coding standard.
具体的转换方式有三种：码率转换、分辨率转换、编码制式的转换。
Videotranscoding has three means: code rate conversion, resolution conversion, conversion between coding standard.
提出了一种充分利用人类视觉系统特性的MPEG视频码流码率转换方法。
In this paper, we propose a new bit-rate transcoding method for MPEG video streams, which can utilize human visual system characteristics adequately.
作为对视频转换编码及码率控制研究的基础，本文首先介绍了几种主要的视频编码标准。
As the basis of the following research on transcoding and rate control, several related video coding standards are introduced in this thesis first.
视频转码器可以满足上述需求，将一种压缩格式的视频码流转换为另一种压缩格式，如不同码率、不同分辨率、不同语法格式等。
A video transcoder is a device that converts video from one compressed format into another compressed format with different bitrate, resolution or syntax.
采用这种码字转换方法，系统误码率性能远远高于没有进行码字转换的系统性能。
The simulation results show that the OCDMA system using the code converters has better BER performance than that without code converters. The data can be successfully transmitted.
视频空间分辨率下变换转换编码过程的运算量较大，受实时性、输出码率的限制，转换后的图像质量会有一定程度的下降。
Video transcoding for reduced spatial resolution needs a lot of computation. Restricted by real-time demand, the quality of transcoded stream will decrease in variant degree.
视频空间分辨率下变换转换编码过程的运算量较大，受实时性、输出码率的限制，转换后的图像质量会有一定程度的下降。
Video transcoding for reduced spatial resolution needs a lot of computation. Restricted by real-time demand, the quality of transcoded stream will decrease in variant degree.
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