free Wmv to iPhone converter?

I am a Zune user while my daughter just purchased an iPhone.
I have a converter which can convert DVD to WMV for my Zune, but the software does not support creating MP4. Is there any freeware convert DVD to MP4? Or I need to convert DVD to WMV, then convert WMV to MP4 for iPhone?
I just googled the <website removed> site, but all shareware.