How to put film onto iPhone?

Ok so I have a film it's an m4v file and it's on my computer and I want to get it onto my iphone, it worked with this other film, how do I do it?

You should make the videos mp4, h2.64 for iPhone and iPhone 3G. I like the DVD to iPhone Converter Suite to rip DVD movie and convert videos in any format to iPhone and iPhone 3G. It is the fastest converter I have used. Also, the output quality is great.

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