FLV is the most supported format among the popular video sharing sites like youtube, metacafe, dailymotion. So, if you want to upload a recorded video on any of these sites, flv format would be the best to upload.
FLV format video will be smaller in size which makes it easy to upload as compared to the large avi, mpeg or any other file format created by your camera or other recording device.
This program is quite simple to use, you simply need to target output format and location of the source file video you want to convert.
You can convert .avi, .mpeg, .mpg, .mp4, .m4v, .wmv, .asf, .mov, .qt, .3gp, .3g2, .dvr-ms. .flv video files into flv and .swf files.
For example:
Convert from avi to flv, mp4 to flv, mpeg to flv, mpg to flv, wmv to flv, mov to flv, 3gp to flv.