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Subject: Re: speex

Re: speex

From: Thom Johansen <thomj_at_rockbox.org>
Date: Mon, 19 Nov 2007 20:32:29 +0100

Onj wrote:
> No sir, I haven't. I wasn't sure how to get there. Is that in the -q
> setting? Also, is there a very quick & dirty listing of the q and c
> modes? I know you mentioned them on this list, but maybe a small table
> that says q1 = such and such, and q10 is such and such.
> I've decided that I would modify my voiceBox.wsf with the -q 10 and -c
> 10 switches as well, and I did this because my drive's cluster size is
> 32 KB so even my longest _dirname.talk which is probably speeking
> something like '[1973] Les Granges Brulees' is only 8.7 kb, so as long
> as all talk clips are below 32 kb, I can still have the highest speex
> settings and not lose any more hd space than I otherwise would.
> Just a hint to anyone wanting to make voiced directory clips actually.
> For the best quality modify voiceBox.wsf and do a search for '-q'
> and change it to -q 10.

Right now, rbspeexenc always uses wideband mode, which uses a 16 kHz
sample rate. To test out ultra-wideband mode (32 kHz), you pretty much
need to use the official speexenc binary. Just feed it any 32 kHz file,
and it will encode it to a UWB mode .spx file which you can listen to
on any Speex capable player (including Rockbox).
All the "-q" levels generate the same sample rate file and use the
same encoding mode. The difference is really just in how many bits each
frame of samples gets.

Thom
Received on 2007-11-19


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