I share you a powerful tool called Aiprosoft Total Video Converter.
http://www.mac-dvd-ripper-soft.com/total-video-converter-aipro.html
◆◆◆◆◆◆◆◆
Key Function:
1: Convert Video to all popular video formats such as avi,wmv,mp4,3gp,flv,mpeg,mpg,mpeg-2,ogg,mov,etc.
2: Extract audio from video and convert audio to mp3,aac,ac3,wma,wav,ogg and so on.
3: Convert video for all popular PMPS such as iPod, iPhone, PSP, Zune, Zen, Nokia, Xperia, etc.
4: Edit your movie such as Trim, Crop, Merge, Snapshot, etc.
5: Fast conversion speed and high image/sound quality.
6: Easy to use.
◆◆◆◆◆◆◆◆
Just try it and hope it can help you.