[Icecast] vorbis ogg vs. aac

Monty xiphmont at xiph.org
Wed Mar 9 01:02:56 UTC 2005

Well, that response wasn't to Mike, but rather the person Mike was
responding to :-)


On Tue, Mar 08, 2005 at 07:56:13PM -0500, Monty wrote:
> On Wed, Mar 09, 2005 at 11:48:50AM +1100, Michael Smith wrote:
> > 
> > Ogg Vorbis is the format we recommend for both high quality or low
> > bitrate. The downside of it is worse compatibility than mp3 - not
> > everyone has a vorbis player, yet. AAC has compatibility problems too,
> > and generally doesn't exceed vorbis in quality, so you're on the right
> > track - use vorbis instead of AAC!
> Although I appreciate the sentiment, it sounds as if you may actually
> be looking at the wrong AAC.  AAC is a collection of related codecs
> all named AAC (in MPEG parlance, the different codecs are called
> 'profiles') and only one of them, the latest/greatest SBR variant, is
> actually any good at low bitrate.  I'm guessing that the encoder you
> found doesn't actually support the AAC 'HE' profile, which is the
> profile you'd want to evaluate for streaming.  The others don't
> generally compare well to Vorbis.
> Monty
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