Video Converter App ( http://www.iosvideoconverter.com/ ) guide demonstrated on iPhone 4 running iOS 5.1.1.
This Video Converter App demo shows how to transfer an FLV file from computer via Wi-Fi Upload, get it converted within the app, and play the converted video on the iPhone.
Note: The step of uploading the FLV file from computer is omitted in the demo. This step requires that you open a web browser in your computer and type the URL into the address bar. Then you will be able to select video files from your computer for transferring to the device.