AVERROR_UNKNOWN    71 extra_lib/include/ffmpeg_android/libavutil/error.h #define AVERROR_UNKNOWN            FFERRTAG( 'U','N','K','N') ///< Unknown error, typically from an external library
AVERROR_UNKNOWN    71 extra_lib/include/libavutil/error.h #define AVERROR_UNKNOWN            FFERRTAG( 'U','N','K','N') ///< Unknown error, typically from an external library