Personally, I use AVS video converter.it can convert Video between Almost Any Formats:
HD Video (inc. AVCHD, MPEG-2 HD and WMV HD), TOD, MOD, M2TS, AVI (DivX, Xvid, etc.), MP4 (inc. Sony PSP and Apple iPod), WMV, 3GP, QuickTime (MOV, QT), SWF, DVD, VOB, VRO, MPEG-1, 2, 4, H.263, H.264, Real Video, DVR-MS, MKV, FLV etc.
If you want a try, here:
http://www.avs4you.com/AVS-Video-Converter.aspx?sct=aff&ct=regnow&cid=175028
I hope this may help you