ffplay: use more sane frame timer resetting logic

Signed-off-by: Marton Balint <cus@passwd.hu>

ffplay.c

@@ -1378,8 +1378,9 @@ retry:
                 return;
             }
 
-            if (delay > 0)
-                is->frame_timer += delay * FFMAX(1, floor((time-is->frame_timer) / delay));
+            is->frame_timer += delay;
+            if (delay > 0 && time - is->frame_timer > AV_SYNC_THRESHOLD_MAX)
+                is->frame_timer = time;
 
             SDL_LockMutex(is->pictq_mutex);
             if (!redisplay && !isnan(vp->pts))