Merge pull request #179 from OpenShot/fixing-cache-performance

Improving cache performance by preventing the cache from getting behind

Author: jonoomph

src/Qt/PlayerPrivate.cpp

@@ -149,7 +149,7 @@ namespace openshot
 		else
 		{
 			// Update cache on which frame was retrieved
-			videoCache->current_display_frame = video_position;
+			videoCache->setCurrentFramePosition(video_position);
 
 			// return frame from reader
 			return reader->GetFrame(video_position);

src/Qt/VideoCacheThread.cpp

@@ -102,6 +102,12 @@ namespace openshot
 				// Ignore out of bounds frame exceptions
 			}
 
+			// Is cache position behind current display frame?
+			if (position < current_display_frame) {
+				// Jump ahead
+				position = current_display_frame;
+			}
+
 	    	// Increment frame number
 	    	position++;
 	    }