May I suggest that the up coming RC4 or 1.0 needs some quality selection adjustments. It has been said that if you are happy now with a particular quality setting, later releases will produce the same quality but reduce the average bitrate. This is not currently the case. IMHO -q4 in CVS is producing almost perfect results and features audio frequencies up to 21khz -- almost CD quality. In my opinion -q1 (80kb/s) is producing results similar or better than mp3@128. Why not reduce the nominal bitrate down a couple of steps. Of course some additional tuning will be required. q 0.0 = 48kb/s (13khz lowpass) q 1.0 = 56 (14khz) q 2.0 = 64 (15khz) q 2.5 = 72 q 3.0 = 80 q 4.0 = 96 (default) q 5.0 = 112 q 6.0 = 128 q 7.0 = 160 q 8.0 = 192 q 9.0 = 256 q 10 = 320 This is still assuming 44.1khz sampling. I presume 22khz has it's own table of quality/nominal bitrates. Just thinking out loud. Good work Monty. Ross Levis. http://winvorbis.stationplaylist.com <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.
Yes, I see a problem with starting 0 at 64, since it makes it hard to go lower. 0 should be rock bottom I think, or it should be possible to go negative, so that it is easier to get lower bitrate modes. The maximum bitrate is 500 isn't it? Mark On Thu, 4 Jul 2002 15:32, Ross Levis wrote:> May I suggest that the up coming RC4 or 1.0 needs some quality selection > adjustments. It has been said that if you are happy now with a > particular quality setting, later releases will produce the same quality > but reduce the average bitrate. This is not currently the case. IMHO > -q4 in CVS is producing almost perfect results and features audio > frequencies up to 21khz -- almost CD quality. In my opinion -q1 > (80kb/s) is producing results similar or better than mp3@128. > > Why not reduce the nominal bitrate down a couple of steps. Of course > some additional tuning will be required. > q 0.0 = 48kb/s (13khz lowpass) > q 1.0 = 56 (14khz) > q 2.0 = 64 (15khz) > q 2.5 = 72 > q 3.0 = 80 > q 4.0 = 96 (default) > q 5.0 = 112 > q 6.0 = 128 > q 7.0 = 160 > q 8.0 = 192 > q 9.0 = 256 > q 10 = 320 > > This is still assuming 44.1khz sampling. I presume 22khz has it's own > table of quality/nominal bitrates. > > Just thinking out loud. > > Good work Monty. > > Ross Levis. > http://winvorbis.stationplaylist.com > > > > --- >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.<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.
Robert Adolfsson wrote:> And to the real topic, the quality setting, I opt for the soloution > where -q0 is _rock_ bottom i.e. the lowest > possible achivable bitrate for the encoder and -q10 the best possible > quality.I can't resist pointing out the irony here, since the whole point of the quality scale is to free the mind from the arbitrary association of bitrate and quality. That said, I agree the q0 ought to be the lowest achievable _quality_. Regards, Owen <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.