Fixed newStarted for jumping to previous frame.

bbiwarg/VideoHandle.cs

@@ -125,7 +125,7 @@ namespace bbiwarg
 
         private void processFrameUpdate()
         {
-            bool newStarted = (lastFrame > CurrentFrame);
+            bool newStarted = (lastFrame - CurrentFrame >= 20);
             Timer.start("processFrameUpdate");
 
             if (newStarted) {