As the subject implies, my question is: is it possible to use the -b (or -M) flag at non-44K sample rates? I'm working with an application that is trying to optimize for very small audio filesize. I found that downsampling to 11K and then using q0 gives high compression, but won't seem to drop below 64kbps or so. It seems like the combination of downsampling, then reducing to 30kps would compress things even further, but I'm not sure if this is allowed. Any ideas? <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-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.
On Thu, 10 Jan 2002, Mike Shapiro wrote:> As the subject implies, my question is: is it possible to use the -b (or > -M) flag at non-44K sample rates? > > I'm working with an application that is trying to optimize for very small > audio filesize. I found that downsampling to 11K and then using q0 gives > high compression, but won't seem to drop below 64kbps or so. It seems like > the combination of downsampling, then reducing to 30kps would compress > things even further, but I'm not sure if this is allowed. Any ideas?Wait for RC4. This will be addressed in that release. --- Stan Seibert <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-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.
On Thu, 10 Jan 2002, Mike Shapiro wrote:> As the subject implies, my question is: is it possible to use the -b (or > -M) flag at non-44K sample rates?No. As Stan said, this will be available in RC4.> I'm working with an application that is trying to optimize for very small > audio filesize. I found that downsampling to 11K and then using q0 gives > high compression, but won't seem to drop below 64kbps or so.You sure you're down-sampling properly? I tested -q0 on the same song for both mono and stereo for 11.025khz, 16khz, 22.05khz, 32khz and 44.1khz. I can produce my results if people are interested. For 11.025khz mono I got 18.4kbps and for stereo I got 35.5kbps. Interestingly, these figures are higher than for RC2 (using -b1), particularly for 11.025khz stereo which is about 8kbps higher. For down-sampling I used ox private-universe.wav -r 11025 [-c 1] -t wav - resample |oggenc -q 0 -o output.ogg - Geoff. <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-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.