Josh, Yes, you can change VBR quality or ABR average bitrate at any time. You don't need to do anything special. I use this feature (changing VBR quality midstream) from time to time and it's quite convenient. Tom Joshua Gargus <schwa at fastmail.us> wrote:> > Hi there (from speex-dev newbie), > > Is it possible to change the target VBR on the fly? The application > is a virtual world with multiple media types (voice, video, 3d > interaction, VNC, etc.) where the total required bandwidth has high > variability. Sometimes we'll be able to spare 30kbps per speaker, and > and other times we will need to restrict the bandwidth considerably. > It would be a shame to always make the worst-case assumption, even > though the bandwidth might usually be available. > > I was going to ask if there are any other speech codecs (commercial or > otherwise) that support this capability, but I guess not since Speex > is the only one that supports VBR (according to http://speex.org/comparison/) > .. Right? > > Thanks, > Josh
Fantastic! Thanks Tom. (if only it was possible to change the VBR target on the fly for the H264 codec we've licensed :-) ) Cheers, Josh On Apr 11, 2008, at 2:39 PM, Tom Grandgent wrote:> Josh, > > Yes, you can change VBR quality or ABR average bitrate at any time. > You don't need to do anything special. I use this feature (changing > VBR quality midstream) from time to time and it's quite convenient. > > Tom > > Joshua Gargus <schwa at fastmail.us> wrote: >> >> Hi there (from speex-dev newbie), >> >> Is it possible to change the target VBR on the fly? The application >> is a virtual world with multiple media types (voice, video, 3d >> interaction, VNC, etc.) where the total required bandwidth has high >> variability. Sometimes we'll be able to spare 30kbps per speaker, >> and >> and other times we will need to restrict the bandwidth considerably. >> It would be a shame to always make the worst-case assumption, even >> though the bandwidth might usually be available. >> >> I was going to ask if there are any other speech codecs (commercial >> or >> otherwise) that support this capability, but I guess not since Speex >> is the only one that supports VBR (according to http://speex.org/comparison/) >> .. Right? >> >> Thanks, >> Josh >
Theora might be able to do that... On Apr 11, 2008, at 18:53, Joshua Gargus <schwa at fastmail.us> wrote:> Fantastic! Thanks Tom. > > (if only it was possible to change the VBR target on the fly for the > H264 codec we've licensed :-) ) > > Cheers, > Josh > > > > On Apr 11, 2008, at 2:39 PM, Tom Grandgent wrote: > >> Josh, >> >> Yes, you can change VBR quality or ABR average bitrate at any time. >> You don't need to do anything special. I use this feature (changing >> VBR quality midstream) from time to time and it's quite convenient. >> >> Tom >> >> Joshua Gargus <schwa at fastmail.us> wrote: >>> >>> Hi there (from speex-dev newbie), >>> >>> Is it possible to change the target VBR on the fly? The application >>> is a virtual world with multiple media types (voice, video, 3d >>> interaction, VNC, etc.) where the total required bandwidth has high >>> variability. Sometimes we'll be able to spare 30kbps per speaker, >>> and >>> and other times we will need to restrict the bandwidth considerably. >>> It would be a shame to always make the worst-case assumption, even >>> though the bandwidth might usually be available. >>> >>> I was going to ask if there are any other speech codecs (commercial >>> or >>> otherwise) that support this capability, but I guess not since Speex >>> is the only one that supports VBR (according to http://speex.org/comparison/ >>> ) >>> .. Right? >>> >>> Thanks, >>> Josh >> > > _______________________________________________ > Speex-dev mailing list > Speex-dev at xiph.org > http://lists.xiph.org/mailman/listinfo/speex-dev
On Fri, Apr 11, 2008 at 6:53 PM, Joshua Gargus <schwa at fastmail.us> wrote:> Fantastic! Thanks Tom. > > (if only it was possible to change the VBR target on the fly for the > H264 codec we've licensed :-) )Theora might be able to do that. Some other folks more closely tied with Xiph probably can comment more on that issue. -- Keith Kyzivat SIPez LLC. SIP VoIP, IM and Presence Consulting http://www.SIPez.com tel: +1 (617) 273-4000 -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.xiph.org/pipermail/speex-dev/attachments/20080413/69dcc36a/attachment.htm