There is another less involved way to make this happen. Simply download ffmegX install it and then follow the instructions on this website. https://www.macosxhints.com/article.php?story=20060906153448633.
To get this to work you also need flip for Mac and the DiVX components for OS X. FfmpegX will export a DiVX AVI, which then can be converted into whatever format you need with QuickTime pro. All this “converting” won’t be good for your video quality, but at least you will have editable source files.