Icecast - Mar 2005 - vorbis ogg vs. aac

Hi folks:

this is my second question at this list and I wanted to mention that with
answers and guides I got from 2 persons last time, I got a quite low rate
stream in vorbis ogg, in about 5 minutes after reading what you wrote-
Thanks!
Well after that, I pointed my attention to the so called AAC, and after
tweaking a bit I got my AAC stream up and connected to Icecast serv.
I was a bit dissapointed about AAC, as I thought this was better
encoding/compression than OGG. I alpologise if I express my selv badly about
the technical detail, but the thing is that at low bitrates (lets say
between 20 and 80 kbps) OGG sounds a lot better than AAC.
As I still believe AAC is a really good one, maybe somebody can tell a
little about where or how I can get the best result with it.
(I can hear an anoying sound "behind" the good one, something like
metal/glass chorus at low rates with aac).

Thanks:

CC

On Tue, 8 Mar 2005 22:43:52 -0200, ZONA <carlos@zonacharrua.com>
wrote:
> Hi folks:
> 
> this is my second question at this list and I wanted to mention that with
> answers and guides I got from 2 persons last time, I got a quite low rate
> stream in vorbis ogg, in about 5 minutes after reading what you wrote-
> Thanks!
> Well after that, I pointed my attention to the so called AAC, and after
> tweaking a bit I got my AAC stream up and connected to Icecast serv.
> I was a bit dissapointed about AAC, as I thought this was better
> encoding/compression than OGG. I alpologise if I express my selv badly
about
> the technical detail, but the thing is that at low bitrates (lets say
> between 20 and 80 kbps) OGG sounds a lot better than AAC.
> As I still believe AAC is a really good one, maybe somebody can tell a
> little about where or how I can get the best result with it.
> (I can hear an anoying sound "behind" the good one, something
like
> metal/glass chorus at low rates with aac).

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!

Mike

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