Annoying Problem

[Gibbonuk]

Right, I tried rotoscoping a short duel with my brother when I noticed a problem that didn't occur on my first rotoscoping attempt:
www.youtube.com/watch?v=daJQPiDNy_E
No real problems here, just my rotoscoping that needs improving but in this duel test:
www.youtube.com/watch?v=GHI9CH9Qrzs

You can see the lightsaber prop I used in several frames as the saber core mask doesn't cover the prop. However in Adobe when I go through each frame, the prop is perfectly covered by the mask and the problem doesn't become visible until after I have saved it. Any help on this problem would be greatly appreciated.

[Gibbonuk]

Actually, nevermind lol. I discovered the problem. When I was saving the movie, the video settings differed from the frame rate of the video I was editing, therefore the final video was being played at a different frame rate which caused the mask to be sightly out of sync with my saber prop. All I had to do was set the video setting frame rate to 29.9 (I think, can't remember) which was the same as the video when I was editing it. Anyways, I ended up with a much better result:

www.youtube.com/watch?v=wlaUVI8e0ng

Might want to include this in a tutorial? It's a very easy, and no doubt common, mistake to make. Or was that just me?