This free online video allows you to convert videos to f4v online. Fast and high quality.
F4V
.F4V Flash Video
What is the f4v format? There are two different video file formats known as Flash Video: FLV and F4V. The audio and video data within FLV files are encoded in the same manner as they are within SWF files. The F4V file format is based on the ISO base media file formatand is starting with Flash Player 9 update 3.