> > 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.
> 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, so are CBR+quality equivalent to CBR+bit-rate or is there some psycho- > acustics that make them different?--quality 8 and --bitrate 15000 are exactly equivalent. That's not the case with --abr.> What is the range of quality <float>? 0-10 like the int or 0.0-1.0?0-10 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/20030114/c3bd36c3/signature-0001.pgp
> > So there should be some equivalency between --abr values and --quality > > values? Or do they effect the rate in different ways. > > Actually, --abr adjusts the quality in real-time so that the average > bit-rate meets a certain target. with just --quality, the final average > bit-rate is dependent on the data, so that's why --abr is there.Is there some time window over which it tries to meet this average?> > I'm still confused as to all of the different ways to specify the bit rat> e/ > > quality of an encoding. Could you enumerate the valid combinations of > > switches? > > Basically, you have CBR and VBR and you can specify either quality or > bit-rate, so: > > CBR+quality = --quality <int> > VBR+quality = --vbr --quality <float> > CBR+bit-rate = --bitrate <int> > VBR+bit-rate = --abr <int>Okay, so are CBR+quality equivalent to CBR+bit-rate or is there some psycho- acustics that make them different? What is the range of quality <float>? 0-10 like the int or 0.0-1.0? Thanks for helping to clear this up for me, Jean-Marc. 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.