Hi Massimiliano,
>From your SIP trace/pjsua log file, it seems the jitter buffer did
some shrinkings and surely this could degrade the audio quality (not
sure if this is the only suspect though). So, I think it would be
great if you could do another test to measure how far those shrinkings
affect the audio quality by disabling the jbuf's shrinking, e.g:
replace jbuf.c line 470:
diff = cur_size - jb->jb_max_hist_level;
with
diff = 0;
If the jbuf shrinking really could degrade the audio quality
significantly, perhaps we should find a way to smoothen or enhance the
jbuf shrinking process.
Thanks,
nanang
On Fri, Sep 26, 2008 at 7:15 AM, Benny Prijono <bennylp at pjsip.org> wrote:
>
> On Thu, Sep 25, 2008 at 2:20 PM, Massimiliano Montevecchi
> <massimiliano.montevecchi at elsagdatamat.com> wrote:
>>
>> Hi Benny
>>
>>
>>
>> This morning I have run about 1500 PESQ evaluations.
>>
>> As I told you, I have used pjsua 1.0-rc2 + changes coming from enhancement
>> #638.
>>
>>
>>
>> In attach you can find the pjsua's configuration used:
>>
>> codec PCMU
>>
>> no vad
>>
>> no echo suppressor
>>
>>
>>
>> I am summing up the results:
>>
>>
>>
>> Result
>>
>> Minimum of OT.PesqScoreMin
>>
>> Average of OT.PesqScoreAvg
>>
>> Minimum of TO.PesqScoreMin
>>
>> Average of TO.PesqScoreAvg
>>
>> Total
>>
>> Executed
>>
>> Failed %
>>
>> TcRun #
>>
>> PASSED
>>
>> 3.56
>>
>> 4.38
>>
>> 3.26
>>
>> 4.38
>>
>> 150
>>
>> 150
>>
>> 0
>>
>> 150
>>
>>
>
> Cool!
>
>>
>> A single test consists of 4 PESQ evaluations on each side of the call:
>> OT.Pesq = PESQ performed on called side; TO.Pesq = Pesq performed on caller
>> side.
>>
>> The speech sample is 7 seconds long and a call is about 1 minute long.
>>
>>
>>
>> You can see that the average of the PESQ score is good, but there is some
>> test with low values.
>>
>> In general the PESQ score with lower value is related to the first
>> evaluation of the call, but that it is not always true.
>
> I see.
>
>>
>>
>>
>> Now I am doing the same tests after the activation of the VAD.
>>
>> The first results highlight that there is a considerable worsening of the
>> PESQ measures stability.
>
> I think I've encountered this before. It's got something to do with the
> jitter buffer too, and what happen was there was a stutter during the start
> of talksprut. This didn't happen when VAD is off of course, since the packet
> will be continuous.
>
> But since then I couldn't reproduce it again, hence I'm not sure if the
> problem has been fixed or not. Probably not, reading your description. So
> this is definitely something that we need to look at.
>
> Thanks
> Benny
>
>>
>>
>> Let me now how to send you logs.
>>
>>
>>
>> Best Regards
>>
>> Massimiliano
>>
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