There is a simple way and free way to convert video to MP3. You can do this with MP4 videos, MOV, and other video formats.

This great Audible converter is capable of converting AA and AAX to MP3, M4A, FALC or WAV formats, if you want to use, transfer, play or burn the Audible files, you can convert Audible books to ...

OK, I'm not exactly sure whether I should post this since, I guess, it borders a little on piracy type stuff. But, I was finally successful in taking a .aa file to .wav to .mp3. No more stupid ...