I recommend Aiprosoft iPod Video Converter.
http://www.macdvdrippersoft.com/ipod-video-converter-aiprosoft.html
It can convert any videos such as avi, wmv, flv, 3gp, mp4, rm, mov, dat, mkv, hd ts, rmvb, mpg, mpeg-1, mpeg-2, divx, xvid, asf, swf, 3g2, m4v, dv, QT, mp3, aac, ac3, wma, wav, ogg, flac, m4a, ape to iPod Video.
It also has powerful video editing functions such as trim, crop, effect, merge, snapshot, watermark and so on, it is also easy to use.
Just try it and I hope it can help you.