> When I set a bit-rate on VBR is that the max that the VBR will go to in a > given second or how exactly does that workSetting a bit-rate for VBR actually means ABR. What you probably want to do is set is the VBR quality (SPEEX_SET_VBR_QUALITY). Jean-Marc -- Jean-Marc Valin http://www.xiph.org/~jm/ LABORIUS Université de Sherbrooke, Québec, Canada -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 190 bytes Desc: Ceci est une partie de message numériquement signée. Url : http://lists.xiph.org/pipermail/speex-dev/attachments/20040507/e55cd27e/signature-0001.pgp
Jean-Marc and others,
We are using Speex inside our Video Conferencing application and have
some
questions about the trade-off of complexity vs bitrate. A little background
information is needed:
1. For us the actual bit-rate isn't that big a deal. Speex running at
14kbps or 8 kbps is minor compared to the video traffic running at 128, 256
or 384 kbps.
2. We care a little about CPU usage - The lower usage the better.
3. We are using 8khz 16bit mono for the raw audio
4. A peaky data-rate isn't a big deal.
We currently use the following options: DTX, VBR (impling VAD), ENH and ABR
Our goal is to get the best sounding audio as possible. Does VBR make more
sense than ABR given our requirments?
When I set a bit-rate on VBR is that the max that the VBR will go to in a
given second or how exactly does that work
Aron Rosenberg
SightSpeed
<p>P.S. - Who do I have to flog at Xiph to not have the mail archives show
real email addresses.
--- >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
'speex-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.
Jean Marc, So assuming the quality setting was set as high as possible, and the audio stream was 8000 hz, 16 bit mono, I have two follow up questions: 1. Does the complexity setting override the quality setting, or does increasing the complexity only lower the rate at a given quality? Or would setting both higher increase the quality more? 2. What sort of impact would setting quality as high as possible have on the data rate? Is there a theoretical upper bound on the VBR data rate (assuming no ABR average rate was set?). Thanks! Tom At 09:58 PM 5/6/2004, Jean-Marc Valin wrote:> > When I set a bit-rate on VBR is that the max that the VBR will go to in a > > given second or how exactly does that work > >Setting a bit-rate for VBR actually means ABR. What you probably want to >do is set is the VBR quality (SPEEX_SET_VBR_QUALITY). > > Jean-Marc > >-- >Jean-Marc Valin >http://www.xiph.org/~jm/ >LABORIUS >Université de Sherbrooke, Québec, Canada-- Tom Harper - tharper@sightspeed.com Lead Software Engineer SightSpeed - A Roda Group Affiliated Company 918 Parker St, Suite A14 Berkeley, CA 94710 Phone: 510.665.2920 Cell: 415.378.3779 http://www.sightspeed.com <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 'speex-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.