Convert FLV Videos to MP4 Without Re-encoding

Most of the online videos are served in flv container. While the container itself is OK it doesn’t have the same capabilities as an MP4 format. For example you cannot properly tag your music videos. In WinAmp when you click Alt+3 (view file info) nothing comes up. You can edit metadata, but they can only be saved for temporarily.
What you can do is to convert these videos to mp4 format without re-encoding, you will not lose quality in the process, as video itself stays the same.
Easiest solution for this job is to use Avidemux, an open source application.
After you download the zip file and extract its contents, open up Avidemux, drag and drop your flv file on it and choose mp4 as format, you don’t need to change any other settings, leave video and audio settings to their default, as copy.

Then save the video.
When you open you new file in WinAmp, you can easily add or change its tag info.

related posts:
how to wrap aac files into m4a or mp4 container
how to tag music files easily by using online databases