You can try 4Easysoft Total Video Converter:
Click here to see the full reviews and have a free trial:
http://www.4easysoft.com/total-video-converter.html
It can convert almost any the video format to another with high output quality.
The key functions are:
1.converting all mainstream video and audio formats
2.extracting audio tracks from video files to other audio formats
3.supporting all popular portable multimedia players
4.editing video-Merge, Trim, Crop and Snapshot
Besides,like its name,it can help you finish the conversion for ease.
Just take the following steps,you can put your movies and music easily on PSP, PS3, iPod, iPhone, Apple TV, Xbox or other digital devices.
Step 1: Download and install 4Easysoft Total Video Converter, run it.
Step 2: Click “add file” button to load your video or audio.
Step 3: Set the output seting.
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.
You can also preview your video and use the editing functions such as "Snapshot", "Crop", "Effect", "Trim", "Merge" to edit your video.
Step 4: Click “Start” button to start your conversion and in a short while it will be finished
Try now.Hope it will not let you down.