@param dsh this function will allocate and fill an AVDiracSeqHeader struct
and write it into this pointer. The caller must free it with
av_free().
@param buf the data buffer
@param buf_size the size of the data buffer in bytes
@param log_ctx if non-NULL, this function will log errors here
@return 0 on success, a negative AVERROR code on failure
Parse a Dirac sequence header.
@param dsh this function will allocate and fill an AVDiracSeqHeader struct and write it into this pointer. The caller must free it with av_free(). @param buf the data buffer @param buf_size the size of the data buffer in bytes @param log_ctx if non-NULL, this function will log errors here @return 0 on success, a negative AVERROR code on failure