RGB24与YUV420格式相互转换，达到视频文件压缩目的。-RGB24 and YUV420 format conversion, video file compression to achieve the purpose.

YUV is a color space typically used as part of a color image pipeline. It encodes a color image or video taking human perception into account, allowing reduced bandwidth for chrominance components, thereby typically enabling transmission errors or co

convert yov to rgb with cmake