Newsgroups:  gmane.comp.video.ffmpeg.user
Date:        Tue, 23 May 2006 18:34:53 -0700

> I know "ffmpeg -formats" can give me a huge list of supported codecs.
> I'm wondering, among those codecs, which one is best for human voice
> recording? By "best" I mean the one that would produce the smallest file
> size -- I don't mind the quality degraded, as long as I can make out of
> it, phone quality is enough.
>
> Maybe gsm? Any better ones?

You are interested in the general category called voice codecs or "vocoders":

http://wiki.multimedia.cx/index.php?title=Category:Vocoders

GSM 06.10 is a possibility. Speex is another open source vocoder solution.

Mike Melanson