AV_NOSYNC_THRESHOLD 1437 ffplay.c           if (!isnan(slave_clock) && (isnan(clock) || fabs(clock - slave_clock) > AV_NOSYNC_THRESHOLD))
AV_NOSYNC_THRESHOLD 1898 ffplay.c                       if (!isnan(diff) && fabs(diff) < AV_NOSYNC_THRESHOLD &&
AV_NOSYNC_THRESHOLD 2293 ffplay.c                   if (fabs(is->frame_last_filter_delay) > AV_NOSYNC_THRESHOLD / 10.0)
AV_NOSYNC_THRESHOLD 2393 ffplay.c               if (!isnan(diff) && fabs(diff) < AV_NOSYNC_THRESHOLD) {