snyders6dogrecipe,
Have you turned on the stats graph? While a video is running, right-click on the screen, at the bottom is "Renderer Settings", then enable "Display Stats".
This will show you what the rendered frame rate is, and show a graph. If the lines are flat, everything is fine and the framerate matches the video.
However, when the video has to resync you will see a spike.
I've noticed that for a while, 3:2 pulldown wasn't working right, and by enabling "Display Stats" I saw a large spike at a regular interval, every 3 or 4 seconds or so. I was then able to understand my problem a little bit better.
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