AV_SYNC_THRESHOLD_MAX 1545 ffplay.c               sync_threshold = FFMAX(AV_SYNC_THRESHOLD_MIN, FFMIN(AV_SYNC_THRESHOLD_MAX, delay));
AV_SYNC_THRESHOLD_MAX 1641 ffplay.c                   if (delay > 0 && time - is->frame_timer > AV_SYNC_THRESHOLD_MAX)