After I import a video into my TimeLine I play it and it plays good.

Then I import the video that will go into the Top Video Track to be my overlay.

I then play this video and it plays good.

So now I move the Top video over so it goes right ontop on the other video on the Bottom.

Now I go into Video FX and select Picture In Picture then I Drage the first option that says Default Ontop of my Top video.

Then at the Bottom of the screen I click on Preview.

Now my Preview Window opens with the Handles around the Top video witch will be my overlay video.

I now Drag and resize the video and move it where I want it so it look good.

Now I close the Video FX Window that is floating above with the other settings.

Now I go to play the video.

The overlay video and the video under it both play Jerky.

The first thing I thought of is that my Top Video that will be my overlay video is not the same Frame Rate because I got it off YouTube.

I opened it in MediaInfo and the RES. and Frame Rate are the same as my Bottom video.

PS if I do video overlay with 2. videos I take with my video camcorder it all works good?

The video I go from YouTube is of a Zombie Girl on a Green Screen so I wanted to make it look like she was in my Bedroom.

Any help will be good thanks.