FFERRTAG 47 extra_lib/include/ffmpeg_android/libavutil/error.h #define FFERRTAG(a, b, c, d) (-(int)MKTAG(a, b, c, d)) FFERRTAG 47 extra_lib/include/libavutil/error.h #define FFERRTAG(a, b, c, d) (-(int)MKTAG(a, b, c, d))