When you have a video on your desktop, and want to put it on your Blackberry, chances are it won't be in the right format. So you may convert video to Blackberry video format.
Comes to video conversion software, HandBrake is probably the best free option. For starters, it is open source, takes advantage of dual core processors, and runs on Windows, Macintosh, and Linux. Handbrake lets users convert just about any video file or DVD into a compatible format for an BlackBerry, iPhone and other mobile devices.
This video to BlackBerry guide shows you how to convert video to BlackBerry with Handbrake.
1. Select a video file from the Source Menu
2. Choose a file name and destination directory
3. Pick ‘Classic’ in the Preset Column
4. Check the “Keep Aspect Ratio” box in the Picture tab
5. Set the width to 480 pixels, leave the height alone
6. In the Video Tab, set the Framerate to 23.976 FPS
7. Also adjust the Average Bitrate to 750 kbps
8. Finally, in the Audio Tab, set Mixdown to Stereo

Once those easy steps are complete, hit start and wait for your video to convert.
Once converting is complete, it’s time to get the video to BlackBerr. You’ll need a microSD to SD adapter or a microUSB cable. Once you have access to the card, copy the converted file into the “videos” folder and that should be it. The video application should replay the video just fine.
Note: If you need to rip DVD and convert video flash to iPod video MP4 on Windows, you can Cucusoft iPod Video Converter Suite.