> > 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? > > 0-10Hmm, 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 --- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project homepage: http://www.xiph.org/ogg/ To unsubscribe from this list, send a message to 'speex-dev-request@xiph.org' containing only the word 'unsubscribe' in the body. No subject is needed. Unsubscribe messages sent to the list will be ignored/filtered.
> > 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... > > For voice, the difference between complexity 4 and 10 is very small > (<0.1 dB in SNR). However, there are cases (e.g. DTMF and other tones) > where there's still a quality gain past complexity 4.Okay, so it does make a difference there. Interesting. Are all values of complexity meaningful or just a select few? Is it like --quality for narrow coding? The test script is getting bigger and bigger. :) I burned three CDs of audio last night to listen to. Now to head over to the stereo... Oh, on a related note, my source material--Doug Stanhope/Die Laughing-- turns out *not to be copyrighted*. There is no copyright notice on the media nor on the CD case/liner notes. As a matter of fact, it says: "Put this CD on every music sharing site you can find. Burn copies for your friends." So, looks like it's a good source of material for testing. :) Anyone want a copy? I can send someone with some web space a FLAC file if they want to make it available to all speex people as a 'corpus'. Never hurts to have a common set of material to work with. And, it's a good listen if you are into horribly offensive comedians. :) Cheers, David --- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project homepage: http://www.xiph.org/ogg/ To unsubscribe from this list, send a message to 'speex-dev-request@xiph.org' containing only the word 'unsubscribe' in the body. No subject is needed. Unsubscribe messages sent to the list will be ignored/filtered.
> 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...For voice, the difference between complexity 4 and 10 is very small (<0.1 dB in SNR). However, there are cases (e.g. DTMF and other tones) where there's still a quality gain past complexity 4. Jean-Marc -- Jean-Marc Valin, M.Sc.A. LABORIUS (http://www.gel.usherb.ca/laborius) Université de Sherbrooke, Québec, Canada <p> -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 242 bytes Desc: signature.asc Url : http://lists.xiph.org/pipermail/speex-dev/attachments/20030115/faf23e8d/signature-0001.pgp