[Speex-dev] Bitrate problem

[Jean-Marc Valin]

On Wed, 2005-12-21 at 15:29 -0800, Alex Bakaev wrote:
> This is a common problem. Sound cards run at different
> clock speeds (but your difference seems kinda high).
> What I'd suggest is dropping silence packets once in a
> while.

Or just use a decent jitter buffer!

	Jean-Marc

> .a 
> 
> -----Original Message-----
> From: speex-dev-bounces at xiph.org
> [mailto:speex-dev-bounces at xiph.org] On Behalf Of Shantanu
> Gramsci
> Sent: Wednesday, December 21, 2005 2:05 PM
> To: speex-dev at xiph.org
> Subject: [Speex-dev] Bitrate problem
> 
> Hello all,
> 
> This is a bit off topic but I am sure many of you can
> answer it.
> 
> I use speex and speex-wb in my VOIP application. With
> speex [at 8 KHz] bitrate is arround 30KBPS, including
> UDP,RTP headers. This is OK for me and I get good quality
> audio.
> 
> Problem is, if call is made from a HIGH END machine [like
> P4 3.2 GHz with good soundcard] to a LOW END machine
> [like P3 550 MHz], high end pc sends at more bitrate than
> as usual [arround 31Kbps].And apparently low end PC
> receives this HIGH bitrate.
> 
> So, slow end PC receives audio packets at arround 8100 Hz
> but it is confiured for 8000 Hz. So there are overflows
> in the directsound buffer at receiver end at periodic
> interval [in my case after every 30 sec], than I flush
> the buffer which makes some distortion.
> 
> What should be approapriate solution for this resynch
> problem?
> 
> 
> Thanks
> 
> Shantanu
> 
> 
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