AVClassCategory   113 3rdparty/include/ffmpeg_/libavutil/log.h     AVClassCategory category;
AVClassCategory   119 3rdparty/include/ffmpeg_/libavutil/log.h     AVClassCategory (*get_category)(void* ctx);
AVClassCategory   188 3rdparty/include/ffmpeg_/libavutil/log.h AVClassCategory av_default_get_category(void *ptr);