Hi! I'm very impressed with the progress Ogg Vorbis has made, ever since getting that T-shirt at LinuxWorld Expo :-) Using oggenc, I've run into a problem, though: "Mode initialisation failed: invalid parameters for bitrate" This happens when 2 conditions are true: 1) the input file has a sampling rate less than 44100, and 2) the -M parameter is used to specify a maximum bitrate. If the input file has a sampling rate of 44100, this problem does not happen, and I can use the -M parameter to lower the maximum bitrate all the way down to 4 kbps (which is almost unintelligible). My goal is to use Ogg Vorbis to make files that have such a small bitrate that they can be streamed over a modem. Under older versions of Ogg Vorbis, I used to be able to do the hack of lowering the sampling rate of my input file, until I got an output of the size I wanted. Now, it seems I can't do this: even at -q 0, the size of the file seems to be too much (it stays at around 64 kbps, no matter what sampling rate is used). Does anyone have a workaround that will solve this problem, and that will allow -M to work even when the input file is not 44100? Thanks! Josh (Krellan) <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.
I have a problem with vorbis rc2 encoding oggs at almost twice the 128 bitrate specified. Is there a way to set a ceiling on the bitrate and has anyone else had this problem? Thanks! <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.
At 07:56 PM 3/10/02 -0800, you wrote:>Hi! I'm very impressed with the progress Ogg Vorbis has made, ever since >getting that T-shirt at LinuxWorld Expo :-) > >Using oggenc, I've run into a problem, though: > >"Mode initialisation failed: invalid parameters for bitrate" > >This happens when 2 conditions are true: 1) the input file has a sampling >rate less than 44100, and 2) the -M parameter is used to specify a maximum >bitrate.Correct. Managed bitrates are only supported for 44.1kHz input, with rc3. There is no workaround, other than to not use 44.1kHz inputs. You CAN use downsampled inputs with VBR modes (-q), though - this should do what you want pretty well. It isn't _ideal_, because full VBR for streaming is obviously not the thing you want - but practically, it's usually fine. VBR modes tend to be close enough to some average that the buffering done by clients is plenty. So that should be a perfectly acceptable short-term solution. Michael <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.