I brought this up 12 months ago or more. I believe the low-pass filter defaults too high with quality -1 in Vorbis 1.0. Is this going to change in the future? I think it should at least cut off at 15khz not 16khz and perhaps even 14khz. I believe it's important when streaming. Removing some of the higher frequencies compared to removing more of the audible sound makes more sense to me. Sampling at 33075 is an option but this produces a cut-off at 13khz which is too low in my opinion, and 32khz samples are not as well supported in players & soundcards. Ross Levis. --- >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:> I believe the low-pass filter > defaults too high with quality -1 in Vorbis 1.0. Is this going to > change in the future? I think it should at least cut off at 15khz not > 16khz and perhaps even 14khz.You can specify your own lowpass setting on oggenc commandline: --advanced-encode-option lowpass_frequency=NN kHz However, you may have to check the docs coming with your version of oggenc. <p>Maik <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:> I brought this up 12 months ago or more. I believe the low-pass filter > defaults too high with quality -1 in Vorbis 1.0. Is this going to > change in the future? I think it should at least cut off at 15khz not > 16khz and perhaps even 14khz.oggenc cuts off frequencies where it needs to in order to get decent sound. I just ran a quick test here, and on this file (and this other one), the cut off is at 15kHz or so according to "Spectrogram 5.0.5". Hmm... and this test file doesn't sound as bad as I expected it to. I'm impressed. Peter Harris --- >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.