So what are the different resolutions and formats supported by Apple’s video playback devices? The table below provides an outline of the maximum resolutions supported, as well as the output quality of the device itself:
The new iPhone has an amazing screen double the resolution of the 5G iPod Video. It goes from 320x240 to 480x320, how confusing. As before, the best format from a compression POV is H.264 and it is now complex to figure out what to encode hwere given the formats. Here is iLounge recommendations for what to encode. Basically you do slightly higher than what the device can handle. 640x480 is probably about the right level
For DVD conversion, Handbrake is the recommended tool on Mac OS X and seems to work OK. "iLounge":http://www.ilounge.com/index.php/articles/comments/the-complete-guide-to-ipod-video-conversion-mac/ like Handbrake for DVD to iPod conversion. It works on Windows and the Mac which is great. I also use autoGK to encode things for PC viewing.
If you are converting Internet content like AVI or DIVX files, then the simple choice is iSquint that makes it easy to convert directly for the iPod Video but it doesn't yet have presets for the iPhone in 320x240 format. The one that loloks quite good is "MPEG Streamclip":http://www.squared5.com which has a specific iPhone format if you are like me and want the minimum size for each device. That is to get an:
# iPod 320x240 for full screen
# iPod i320x180 for 16:9 letterboxed
# iPhone 432x320 for 4:3 full screen
# iPhone 480x272 for 16:9
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