[speex-dev] --dtx alone does nothing?

David Willmore davidwillmore at iamanidiot.com
Wed Jan 15 00:22:24 PST 2003



> > Is there some time window over which it tries to meet this average?
> 
> Right now, it looks at what's the average bit-rate so far and does some
> adjustments to meet the target. There might be ways to improve, it's
> very rough right now. Also, note that you'll likely get better results
> by trying several --quality until you get the right bit-rate than with
> --abr.

Okay, good for files, but not probably what the telephony guys want, but
it makes sense, it's a fairly straightforward way to do it.

> > Okay, so are CBR+quality equivalent to CBR+bit-rate or is there some psyc=
> ho-
> > acustics that make them different?
> 
> --quality 8 and --bitrate 15000 are exactly equivalent. That's not the
> case with --abr.

I was thinking there was going to be a 1:1 like that.  Cool.

> > What is the range of quality <float>?  0-10 like the int or 0.0-1.0?
> 
> 0-10

Hmm, sort of like vorbis. :)

One last thing. ;)  Is there much meaning to complexity values >3?  From
a quick scan of the code, it looks like there are >1 and >2 comparisons,
but not much more than that.  I want to run my test over all meaningful
values of complexity and it takes a long time to do a run...

Thanks for all the info.  I imagine we're going to need a FAQ before long.
I'm predicting a large increase in out user base. ;)

Cheers,
David
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