[Icecast] Re: [Vorbis] AACplus

Ross Levis ross at stationplaylist.com
Fri Feb 25 14:23:52 PST 2005

The listeners I mentioned were comparing MP3 128k streams and 48k AACPlus 
streams from the same organization.  They have several streams running, and 
the input audio is the same.

There were 30 or 40 comments I read on the forum (before giving up) about 
the AACPlus feeds when they were introduced, and at a guess 95% said it 
sounded much the same except MP3 had slightly more bass and AACPlus had 
better treble (highs).

> But at lower 'streaming radio' rates, no, Vorbis isn't the best.  It 
> wasn't tuned / designed for those rates.
Roberto's 32k rate listening test didn't show Vorbis in a good light...  I 
doubt a 48k test would be much different.

It is the low bitrates that I'm concerned about, and streaming radio is 
concerned with, so the 1 million dollar question is:  Is it possible that 
Vorbis can be tuned in a substantial way to sound anywhere close to AACPlus 
at low bitrates.  I currently stream a 28-32kb/s mono Vorbis stream using 
44khz, q=-2, but I've heard an AACPlus 32kb/s stereo stream and it sounds 
much better, Much more highs.

Last I heard, Vorbis is cannot benefit from SBR or PS.


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