I've been converting movies into MP4 for my PSP for a while now, and I've figured out all the basic stuff.

Now, though, after a few movies, the volume just isn't loud enough on headphones to always hear in a public setting, and it ruins being able to watch a movie. So I decided that I would just put some subtitles on my mp4's. Simple, right?

I ripped my DVD, and extracted the subs with SubRip. Saved the .srt, and went into XviD4PSP, opened the movie file, and my subs. Then I converted, and after a couple hours I had a MP4, but the the audio and video were WAY off, by a minute at least. The audio and subs were on track, however. Does this have something to do with the frame rates of the video? I've never experienced this problem using any other converters I have used. Thanks!