Hi,
I experienced this problem as well when using speex in VoIP
application, I only tested the wideband mode:
- if silence is in the beginning, CPU is fine.
- if silence is in the middle (after voice), suddenly CPU increased
significantly.
I tried to reproduce the problem (in Mac/Linux):
* 1 second tone + 4 seconds silence
$ time ./speexenc -w --vad t400-sil-5s.pcm out-sil.spx
Encoding 16000 Hz audio using wideband (sub-band CELP) mode (mono)
real 0m0.650s
user 0m0.629s
sys 0m0.025s
* 5 seconds tone
$ time ./speexenc -w --vad t400-5s.pcm out.spx
Encoding 16000 Hz audio using wideband (sub-band CELP) mode (mono)
real 0m0.271s
user 0m0.246s
sys 0m0.028s
Attached is the PCM files used for this test.
Regards,
nanang
On 17/04/2008, Jean-Marc Valin <jean-marc.valin at usherbrooke.ca>
wrote:> Sounds strange. Can you reproduce the problem with speexenc/speexdec? If
> so, can you send a short file that triggers that along with the exact
> command line?
>
> Jean-Marc
>
> Jozsef Vass a ?crit :
>
> > Hi Jean-Marc
> >
> > I am using speex in my voip app (wideband mode). I
> > have noticed that when VAD kicks in, CPU considerably
> > increases (bitrate decreases to 4 kbps). It takes
> > about 7 ms to encode one frame versus 0.5 ms (for
> > speech). This happens regardless preprocessor is used.
> >
> > Although the issue seems to be driver dependent, it
> > occurs on XP, Vista and Mac OS X.
> >
> > Besides complexity and quality, this is the only
> > parameter set for encoder.
> >
> > We use the latest released version, 1.2beta3.
> >
> > Are you aware of any possible problem in VAD?
> >
> > Thanks.
> >
> > Jozsef
> >
> >
> >
> >
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