@param log_ctx a pointer to an arbitrary struct of which the first field is a
pointer to an AVClass struct (used for av_log).
@param tc pointer to an allocated AVTimecode
@param rate frame rate in rational form
@param str timecode string which will determine the frame start
@return 0 on success, AVERROR otherwise
Parse timecode representation (hh:mm:ss[:;.]ff).
@param log_ctx a pointer to an arbitrary struct of which the first field is a pointer to an AVClass struct (used for av_log). @param tc pointer to an allocated AVTimecode @param rate frame rate in rational form @param str timecode string which will determine the frame start @return 0 on success, AVERROR otherwise