https://www.videolan.org/developers/x264.html
x264 is a free software library and application for encoding video streams into the H.264/MPEG-4 AVC compression format, and is released under the terms of the GNU GPL.
据说：“ ffmpeg的编码过程其实是调用了libx264库完成的，所以我们可以不需要ffmpeg的源代码，直接调用libx264库，将输入的YUV数据编码为h264”
https://blog.csdn.net/qq_41051855/article/details/78664873
OpenCV采集的视频流转化成H264格式裸码流
https://www.cnblogs.com/ziyu-trip/p/7075003.html
FFmpeg解码H264裸流并转换成opencv Mat
https://blog.csdn.net/qq_24328101/article/details/74205686