Hi, I'm trying to extract the audio from an mp4 video file to mp3 format and don't have the option with the newest version of mpeg streamclip. I can only choose from AIFF, MP4 AAC, or MP2. I used to be able to select mp3 with 1.9.3b2 on my older Macbook Pro running OS 10.7.5. I'm currently running OS 10.8.2 on my new Macbook Pro. Any solutions?