I’ve received a fair bit of follow-up email to my Mac 911 blog entry from last week, Extracting audio from movies with iLife. Now seems as good a time as any to address a couple of those messages.

You don't need Premium to download YouTube videos and audio.

Extract audio streams from Blu-ray, DVD-Audio and DVD-Video discs and save them as OGG, MP3, Wave or FLAC files. DVD Audio Extractor can also demux audio streams directly to mlp, pcm, mpa, ac3 or dts ...

When extracting the audio using Virtualdub, it creates a .wav file but does not do any conversion as far as I am aware. For example, I extracted the sound from an avi which had mp3 compressed audio.