On Friday 12 August 2011 12:30 AM,
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Today's Topics:
1. Re: Pops/Crackles Messing up my audio... (Nasa)
2. Re: Need help to reduce delay with USB, mic using pulseaudio
(Pierre-Louis Bossart)
----------------------------------------------------------------------
Message: 1
Date: Thu, 11 Aug 2011 17:09:25 +0000 (UTC)
From: Nasa<[email protected]>
Subject: Re: [pulseaudio-discuss] Pops/Crackles Messing up my audio...
To: General PulseAudio Discussion
<[email protected]>
Cc: [email protected]
Message-ID:
<294431320.552022.1313082565114.javamail.r...@sz0115a.westchester.pa.mail.comcast.net>
Content-Type: text/plain; charset=utf-8
----- Original Message -----
----- Original Message -----
'Twas brillig, and Nasa at 07/08/11 21:26 did gyre and gimble:
Hi,
I was hoping I could get some help troubleshooting some audio
quality issues I am running into.
Specifically, I am getting a lot of *pops/crackles* when I play
audio files. It shows up when I
move from 2-channel to 4/5 channel audio (via pauvcontrol) - I am
using a USB X-FI sound-card with
the Meego IVI.
I have tried changing the resample method (going from ffmpeg to
high-quality) and setting tsched=0,
neither making any noticeable difference.
The only things I saw in /var/log/messages that seemed relevant
was:
messages:Aug 6 16:59:26 localhost pulseaudio[570]: alsa-sink.c:
ALSA
woke us up to write new data to the device, but there was actually
nothing to write!
messages:Aug 6 16:59:26 localhost pulseaudio[570]: alsa-sink.c:
Most
likely this is a bug in the ALSA driver 'snd_usb_audio'. Please
report this issue to the ALSA developers.
messages:Aug 6 16:59:26 localhost pulseaudio[570]: alsa-sink.c: We
were woken up with POLLOUT set -- however a subsequent
snd_pcm_avail() returned 0 or another value< min_avail.
And this was spout out of dmesg
[ 21.857184] ALSA sound/usb/mixer.c:2110: status interrupt: c0 00
[ 21.897058] ALSA sound/usb/mixer.c:2110: status interrupt: c0 00
[ 21.961062] ALSA sound/usb/mixer.c:2110: status interrupt: c0 00
I have already eliminated the speakers and the amp (played music
from a different source and
they sounded fine).
Let me know what else I should post (I could record the sound, if
that would be useful).
Thanks in advance,
While this could be an issue in the alsa driver itself, can I ask if
you're applying any volume changes to your streams or sink?
There could be a problem with optimized paths for software volume
adjustments. You can disable these optimisations via a special
environment var: PULSE_NO_SIMD=1
Col,
So I added
export PULSE_NO_SIMD=1
into my .bashrc file and rebooted. From the terminal
"echo $PULSE_NO_SIMD" came back '1' -- however, that didn't
make any difference in the pops/crackles I am hearing :{
Nasa
So,
Is there anything else I can check, or should I place a bug report
for ALSA?
Nasa
------------------------------
Message: 2
Date: Thu, 11 Aug 2011 12:48:38 -0500
From: "Pierre-Louis Bossart"<[email protected]>
Subject: Re: [pulseaudio-discuss] Need help to reduce delay with USB,
mic using pulseaudio
To: "'General PulseAudio Discussion'"
<[email protected]>
Message-ID:<007c01cc584e$e6bcfba0$b436f2e0$@[email protected]>
Content-Type: text/plain; charset="us-ascii"
Use module-loopback and play with the latency parameters.
In case you don't know what the latency parameters are, on the
gst-launch line, you can append these parameters: e.g.
gst-launch-0.10 pulsesrc buffer-time=<xxxx> latency-time=<xxxx> !
pulsesink buffer-time=<xxxx> latency-time=<xxxx>
I suspect Pierre was referring to the latency_usec param on module-
loopback.
Correct. Providing data to a client and back isn't the most efficient thing
to do if you can handle this in IO threads.
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End of pulseaudio-discuss Digest, Vol 4, Issue 32
*************************************************
What is module-loopback?
I changed buffer-time and latency-time for different values in
gst-pieline but no success. It reduces delay very less amount i.e delay
is still there
(2-2.5 sec).
When I use alsasrc and alsasink with the same usb mic getting no delay
with good audio quality.
Please help to solve the problem.
Regards
Ashwani
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