[Speex-dev] Change target VBR on-the-fly?

Joshua Gargus schwa at fastmail.us
Fri Apr 11 15:53:46 PDT 2008

Fantastic!  Thanks Tom.

(if only it was possible to change the VBR target on the fly for the  
H264 codec we've licensed :-)  )


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

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