• The video formats it supports are: .M4V, .MP4, and .MOV
• The audio formats it supports are: AAC, MP3, WAV, and AIFF

So If you want to put your own videos on iPhone and extract audio from videos to iPhone, you need to convert video to the formats that compatible with iPhone. This is a tutorial on how to convert video to iPhone video and iPhone audio on Mac OS X (Tiger and Leopard).

Blow away any previous tools and software you might have installed that you don't need and you think might conflict with getting a good DVD rip. Also blow away any old media files you don't need. This process is fairly heavy on resources so generally the more room you have and the less things that can get in the way, the better.

Software you need:

1. iSkysoft Video Converter for Mac - iSkysoft Video Converter for Mac is a powerful video to iPhone Mac software that can convert videos to iPhone format with super high quality. It can also extract audio from videos and then convert to iPhone audio format files such as AAC, MP3.
2. iTunes (free download)

1Install and Run Video Converter for Mac

You can download it for free:

• Intel Version
• PowerPC Version

To install it, simply mount the .dmg archive by double-clicking it, and copy the application to your applications folder (or wherever you want it).

2Load videos to iPhone Video Converter for Mac

3Convert Video to iPhone on Mac OS X

If you want to convert videos to iPhone format, you need to select the output format as iPhone video MPEG-4 (*MP4).

If you want to extract audio from video to iPhone, you need to select the output format as AAC or MP3.

You can know more here: How to edit, crop, trim video files and capture pictures on Mac OS X ?

4Transfer converted Video to iPhone on Mac

Connect your iPhone and start iTunes. Find the file you made above and drag it onto your iPhone.

Click add file to library.

Open the file in iTunes. Go to video source on top left menu just beneath library.

It won't be on your iPhone until you sync - make sure you have the movies box checked in your iPhone preferences.

That's it. Enjoy!