[vorbis-dev] Why Point-Stereo at 160 kbps ?

Sebastian Gesemann
Tue, 30 Jul 2002 07:02:15 -0000

Hi there !

I checked Vorbis' performace for mono files at
approx. 64-80 kbps (it does a good job) and I'm
wondering why the current OggEnc still uses
Point-Stereo (>10kHz) for -q4 and -q5

I know, we're usually unable to percieve those
phase correlations above 10 kHz, But a
Dolby Prologic Decoder isn't.

I think a future version of OggEnc which is able
to use a user-selectable stereo mode would be graet.

I think back to the time, where everyone just
realized that the old L3ENC destroyed
phase correlations using intensity stereo and thus
being unable to handle dolby surround effects
correctly.
Most people switched to "Pure"-stereo hoping to get
a better sounding file...

And as a Ogg/Vorbis fan...
i don't want its reputation to be harmed.
;-)

thanks and bye,
Sebastian

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