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Well, Visual Hub can do that, but it costs money. I assume ffmpegX, which is free, should be able to do the same thing.
 
I thought he wanted to convert mp4 into something that could play on a DVD player. If he wanted to convert something to mp4, iSquint is by far the best choice.
 
Yeah, or Toast should be able to do it automatically as well; if not, convert to mpeg (or possibly mov) first...
 
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