static int check_timecode(void *log_ctx, AVTimecode *tc) { if (tc->fps <= 0) { av_log(log_ctx, AV_LOG_ERROR, "Timecode frame rate must be specified\n"); return AVERROR(EINVAL); } if ((tc->flags & AV_TIMECODE_FLAG_DROPFRAME) && tc->fps != 30 && tc->fps != 60) { av_log(log_ctx, AV_LOG_ERROR, "Drop frame is only allowed with 30000/1001 or 60000/1001 FPS\n"); return AVERROR(EINVAL); } if (check_fps(tc->fps) < 0) { av_log(log_ctx, AV_LOG_WARNING, "Using non-standard frame rate %d/%d\n", tc->rate.num, tc->rate.den); } return 0; }