You can try Aiseesoft Total Video Converter.
Download it and see the full guide here:
http://www.macsoftreviews.com/aiseesoft-total-video-converter.html
It is very easy to use and has high output quality and converting spped.
The following are the steps to convert the video to any ipod.
Step 1: Download and install Aiseesoft Total Video Converter, run it.
Step 2: Click “add file” button to load your video or audio.
Step 3: Select the output video format you want from the “Profile” drop-down list.
You can also click the “Settings” button to set the value of Frame Rate, Resolution, Bitrate and so on.
Step 4: Click “Start” button to start your conversion and in a short while it will be finished
Some other functions such as "Snapshot", "Crop", "Effect", "Trim", "Merge" are also very easy to use.
Try now.Hope it can help you.