The technology of video stream transcoding can be divided into two types: spatial domain(pixel-domain) and compressed domain(DCT-domain).
目前的视频流转码大致可以分为空域（像素域）转码和压缩域（DCT域）转码两种方法。
The video transcoding can process the pre-compressed bit-stream dynamically and convert one compressed bit-stream to another, which is the effective way to provide UMA.
视频转码技术可以动态处理压缩码流，将一种格式的压缩码流转换为另一种格式的码流，是有效提供通用多媒体存取服务的手段。
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。
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