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coturn安装 - ubuntu

yuv格式之间视频格式转换：ffmpeg -pix_fmt yuv420p -s 176x144 -i input_420p_176x144.yuv -pix_fmt yuyv422 output_yuyv422_176x144.yuv yuv格式视频下载：http://trace.eas.asu.edu/yuv/ https://www.jianshu.com/p/2933b1cbebf6 YUV格式的采样和映射：https://glumes.com/post/ffmpeg/understand-yuv