There is a Media Converter add-on module for the FireFox web browser that is able to convert between a variety of media file formats while files are being download from the web. It even will convert video to audio files, making it possible, for example, to download YouTube videos directly to audio files that you can put on a portable audio player or burn to a CD.
Media Converter add-on installation is very simple and takes only a few seconds. It can be uninstalled just as easily.
If you use Firefox, go to
Media Converter, look at the images and read the (
actually short) 'Long Description.' Then click the green 'Add to Firefox' button to install the software.
Note that the Media Converter add-on is not able to convert files that are already on your computer hard disk. It only converts files being downloaded from the web from one media file type to another.
-Bob