I use this program to convert movies (all formats, RM/QT/Divx/etc) for all my devices, ipod/iphone/DS/PSP/GBA. It's really fast too. I think it's the best converter out there and thought I'd share it with you guys. If anyone knows PERL, you can write plugins to convert pretty much every device known to man (MP4/DPG/PMP).
ezbuilder
It's a very simple command line application but really well written. All I do is put the videos I want to convert into the MediaFile Folder and run ezbuilder.
Instructions from website:
1. Copy the videos you want to convert into the MediaFile folder.
2. Then run ezbuilder.exe.
3. Choose the target you want.
When your file is converted, it should show up in the DoneFile directory.
Ezbuilder needs the following software (It needs system codec for directshow reading)
1. Avisynth 2.5.6a (or higher version)
http://www.avisynth.org
2. For converting rm / rmvb , please install Real Alternative
Free-Codecs.com :: Download Real Alternative 1.75 : Real Alternative will allow you to play RealMedia files without having to install RealPlayer/RealOne Player
3. For converting Quicktime file type clip , please install QuickTime Alternative
Free-Codecs.com : QuickTime Alternative 2.5.1 : QuickTime Alternative will allow you to play QuickTime files (.mov, .qt and other extensions) without having to install the official QuickTime Player.
4. Suggest installing K-Lite Mega Codec Pack (it has Quicktime and Real codecs already!)
Free-Codecs.com :: Download K-Lite Mega Codec Pack 3.9.0 : The K-Lite Mega Codec Pack includes the K-Lite Codec Pack Full, QuickTime Alternative, Real Alternative support and Monkey's Audio DirectShow decoder.