here i recommend you Aiseesoft iPod Movie Converter.
it can convert MPG, MPEG, MPEG2, VOB, MP4, M4V, RM, RMVB, WMV, ASF, MKV, TS, MPV, AVI, 3GP,3G2, FLV, MPV, MOD, TOD to iPod/iPhone MP4 Movies with high speed and excellent image/sound quality.

Free download it here:
http://www.aiseesoft.com/ipod-movie-conv…

here is how to use it:
Step 1: Install and run Aiseesoft iPod Movie Converter.
Step 2:click the “Add File” button to load your video.
Step 3: Select iPod video formats from "Profile" drop-download list
Step 4: Set the special settings such as "trim","effect",etc to cater to your need and click "Start" to start your conversion.

Just have a try and I hope it can be helpful to you!