First let me say that I was absolutely astounded at the sound quality when using oggenc at q = -1 (around 50 kbps). So much so, that I'm anxious to try some of the lower bit rates that were mentioned in the announcement for 1.0: ... audio and music at fixed and variable bitrates from 16 to 128 kbps/channel. But I am having trouble finding how to use either oggdrop or oggenc to get these low bit rates. I'm looking at two applications - compressing FM talk radio (in stereo - maybe around 32-40 kbps) and a voice recorder (in mono - perhaps around 16-24 kbps). For now, the voice recorder is tied to a laptop - in the future hopefully I can get smaller hardware for that function (like the Ripflash for mp3). Any advice on resampling rates, low pass filter cutoffs, or any other advanced oggenc tricks would be very welcome. Thanks Dara Parsavand (For very low bit rates, I did listen to the speex samples, but these are too distorted for my tastes. Since I don't care about low latency encoding, and I'm not that tight on the bitrate constraints - I'd rather use oggenc.) --- >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.
oggenc -M 16 --downmix in.wav will give you a mono (downmixed from stereo) ogg with a maximum bitrate of 16kbps...> But I am having trouble finding how to use either oggdrop or oggenc to > get these low bit rates. I'm looking at two applications - compressing > FM talk radio (in stereo - maybe around 32-40 kbps) and a voice > recorder (in mono - perhaps around 16-24 kbps). For now, the voice > recorder is tied to a laptop - in the future hopefully I can get > smaller hardware for that function (like the Ripflash for mp3). Any > advice on resampling rates, low pass filter cutoffs, or any other > advanced oggenc tricks would be very welcome. > > Thanks Dara Parsavand > > (For very low bit rates, I did listen to the speex samples, but these > are too distorted for my tastes. Since I don't care about low latency > encoding, and I'm not that tight on the bitrate constraints - I'd > rather use oggenc.) > > --- >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.
Mark wrote:>oggenc -M 16 --downmix in.wav > will give you a mono (downmixed from stereo) ogg with a > maximum bitrate of 16kbps...Unfortunately this gives me: "Mode initialisation failed: invalid parameters for bitrate" (shouldn't this be initialization?) I get the same message for any rate under 37 (though 37 works, which is rate not available in oggdrop. It doesn't sound too bad either). Dara Parsavand --- >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.
> I'm looking at two applications - compressing > FM talk radio (in stereo - maybe around 32-40 kbps) and a voice > recorder (in mono - perhaps around 16-24 kbps).I find that -q -1 degrades quality too much. You may want to stick to -q 0, but try the resampling and downmixing options, instead. -q 0 --resample 22050 will give you great stereo music at about 40kbps. -q 0 --resample 11025 --downmix hould be good for mono voice, but didn't try it yet. If at all possible, you should avoid fixed/managed bitrates, and let VBR work its magic. <p> -- "Oddly enough, Python's use of whitespace stopped feeling unnatural after about twenty minutes." Eric S. Raymond Nicola Larosa - nico@tekNico.net <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.