Caleb wrote: > i dont understand you people. >-q0 should be poor quality, only that in vorbis, the poor quality is > actually good! :) Another advantage I see in reducing the nominal bitrate for q0 to 48kb/s with a ~13khz lowpass is a smoother transition in average bitrate and frequency resolution from 22khz to 44khz sampling. Currently there is a jump from 11khz (at 22khz sampling) to 15khz (at 44khz sampling -q0). But then I suppose there is 33khz sampling but I don't think too many devices support it. Something to think about: One global quality scale from 0 to 10. 0 = resample to 11khz, 8kb/s, through to 10 = original sample rate, high kb/s. Ross. <p>--- >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 'vorbis-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.
On Sat, 6 Jul 2002, Ross Levis wrote:> Something to think about: One global quality scale from 0 to 10. 0 > resample to 11khz, 8kb/s, through to 10 = original sample rate, high kb/s.I don't like this idea. For starters, it's much less intuitive than the current system. My feeling is that, unless you specify resampling (which apparently CVS oggenc can now do), you should get out what you put in. Besides, that would severely compress the quality scale to the point where you'd regularly have to deal in decimal points, which I'm sure a lot of people won't be keen on. My take in this is this. I'm guessing that Monty wouldn't have included a 48kbps mode unless he could get it to sound something comparable to RC3's 64kbps. Therefore, shifting q0 down to 48kbps would be in line with the whole quality way of doing things. Like someone else said, keep it sounding the same, just shift the rates. I note that Monty has been rather quiet on this issue. Since I suspect that what he says goes, what's your take on this, Monty? Geoff. <p><p> -- Geoff Shang <gshang@uq.net.au> ICQ number 43634701 Make sure your E-mail can be read by everyone! http://www.betips.net/etc/evilmail.html Please avoid sending me Word or PowerPoint attachments. See http://www.fsf.org/philosophy/no-word-attachments.html <p><p>--- >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 'vorbis-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.
Ross Levis wrote:> Something to think about: One global quality scale from 0 to 10. 0 > resample to 11khz, 8kb/s, through to 10 = original sample rate, high kb/s.No, definitely not. -q0 should be "lowest possible quality for that certain kind of input", IMO. I never want any tool to decide things for me, like resampling and similar. I don't even like lame and other MP3 encoders doing that ... it *should* do that only when presets are being used. So I'm very happy how Vorbis used to do this, and I don't want that to change. The ability to choose both, input and quality settings, gives you another complete set of options on how to tweak a stream for exactly your needs, for example. <p>Moritz --- >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 'vorbis-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.