I'm using Nestopia 1.40

On certain games, I try to record a video (.nsv file) so I can convert it to .avi for uploadage to youtube.

However, on some games that I try this on, the video is not what I did in the game, (Castlevania III Super Mario 2 for example) and on some occasions the file is corrupt. This works the way I want on most games, but on a few games I've run into the problem.

Can someone enlighten me on what I'm doing wrong?