-#if LIBAVUTIL_VERSION_MAJOR < 51
-#define AVERROR_INVALIDDATA AVERROR(EINVAL) ///< Invalid data found when processing input
-#define AVERROR_IO AVERROR(EIO) ///< I/O error
-#define AVERROR_NOENT AVERROR(ENOENT) ///< No such file or directory
-#define AVERROR_NOFMT AVERROR(EILSEQ) ///< Unknown format
-#define AVERROR_NOMEM AVERROR(ENOMEM) ///< Not enough memory
-#define AVERROR_NOTSUPP AVERROR(ENOSYS) ///< Operation not supported
-#define AVERROR_NUMEXPECTED AVERROR(EDOM) ///< Number syntax expected in filename
-#define AVERROR_UNKNOWN AVERROR(EINVAL) ///< Unknown error
-#endif
-