http://www.mp3-box.org/freeware-mp3-mp4-converter/
Good Video (mp4) to Mp3 converter?
I got a bunch of music videos that i want to put on my ipod as music, I would prefer one which i can select a bunch at once and convert them all. I would normally go through thousands of different ones and take ages to find a good one, but i thought i’d ask you guys for your opinions to save time. Also i would prefer if it was freeware 
Thanks a lot 
you can try this converter: http://mp4-converter.info/
1. download converter
2. click the button “select files”
3. click the button “convert”
4. click the button “copy to iPod”
Use batch conversion mode to save time and convert your entire music and video library with one click!
Free Mp4 to Mp3 Converter – Best Mp4 to Mp3 Convert