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介绍了该系统的组成、制式转换的基本工作原理、用FPGA实现的途径、视频混合的方法和实际应用效果，给出了方框图。
The constitution of the system, basic operating principle, the approach implemented with FPGA, video mixing method and the practical application effect are introduced, the block diagrams are given.
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.
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