[speex-dev] vbr and music

[Conrad Parker]

On Sat, Jan 25, 2003 at 06:14:09AM -0600, Matthias Granberry wrote:
> I know speex is not supposed to do a great job compressing music, but
> I've noticed that the new VBR code chokes completely when you try to
> compress horns.  I've placed a particularly offensive example up at
> http://www.utdallas.edu/~matthias/ .  Take a look at a-16m*{ogg,spx}.
> a.ogg is the first minute of an ogg created from the source media (in
> 44khz stereo).  The rest have been mixed down to mono and resampled to
> 16khz.  The fixed-bitrate recording at quality 5 is fairly listenable,
> but the VBR encoding drops the bitrate down to where the artifacts
> make it almost entirely unlistenable.

Hi,

my guess would be that in vbr mode, speex effectively finds all the
bits that sound like speech, and compresses them really well, and then
it throws the rest away, because it is a speech codec.

without vbr it might be more generous with what it keeps :)

Conrad.
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