After several attempts to transfer some of my concert dvds to my ipod, finally got them working, here is how:

I first update the ffmpeg packages from medibuntu, after this install dvd::rip package from multiverse, once I had dvd::rip opened a new project, and select the option to “Encode DVD on the fly” in order to save some space in my disc, here is an screenshot about the settings I used to encode:

Once I had the .avi file I execute the following command to convert the file to a .mov:

ffmpeg -i 24_1_001.avi -f mov -b 1800 -maxrate 2500 -vcodec xvid -qmin 3 -qmax 5 -s 640×360 -padtop 30 -padbottom 30 -acodec aac -ab 128 24_1_001.ipod.mov

The result is a good quality video to enjoy it in your ipod.