Debian Bug report logs - #659627
libasound2: stuttering audio due to continuous underruns

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: "Mario 'BitKoenig' Holbe" <Mario.Holbe@TU-Ilmenau.DE>

To: submit@bugs.debian.org

Subject: libasound2: stuttering audio due to continuous underruns

Date: Sun, 12 Feb 2012 17:50:23 +0100

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Package: libasound2                      
Version: 1.0.25-2

Hello,

upgrading libasound2 to 1.0.25-2 leads to stuttering audio when playing
TV via xawtv (3.102-3) and xawtv continuously reporting
	ALSA lib pcm.c:7339:(snd_pcm_recover) underrun occurred
while reading from hw:1,0 (32KHz Bt87x Digital capture device of a Bt878
TV card, driven by snd_bt87x).
Downgrading to 1.0.24.1-4 solves this issue.


Furthermore in conjunction with pulseaudio I noticed with 1.0.25-2
alsamixer shows the normal card0 mixers while with 1.0.24.1-4 it did
show the PulseAudio mixer. I don't know if those both symptoms are
connected. According to changelog.Debian the latter could be
intentional, but IMHO libasound2 should then break old/current
pulseaudio versions to enforce coordinated upgrades.
If you think those both issues should be treated separately, please feel
free to clone this bug.


Thanks for your work & best regards
   Mario
-- 
Programmieren in C++ haelt die grauen Zellen am Leben. Es schaerft
alle fuenf Sinne: den Schwachsinn, den Bloedsinn, den Wahnsinn, den
Unsinn und den Stumpfsinn.
                                 [Holger Veit in doc]

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Message #10 received at 659627@bugs.debian.org (full text, mbox, reply):

From: "Mario 'BitKoenig' Holbe" <Mario.Holbe@TU-Ilmenau.DE>

To: 659627@bugs.debian.org

Subject: Re: libasound2: stuttering audio due to continuous underruns

Date: Tue, 21 Feb 2012 20:13:40 +0100

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On Sun, Feb 12, 2012 at 05:50:23PM +0100, Mario 'BitKoenig' Holbe wrote:
> upgrading libasound2 to 1.0.25-2 leads to stuttering audio when playing
> TV via xawtv (3.102-3) and xawtv continuously reporting
> 	ALSA lib pcm.c:7339:(snd_pcm_recover) underrun occurred
> while reading from hw:1,0 (32KHz Bt87x Digital capture device of a Bt878
...
> Furthermore in conjunction with pulseaudio I noticed with 1.0.25-2
> alsamixer shows the normal card0 mixers while with 1.0.24.1-4 it did

After pulseaudio upgrading to 1.1-3 and a reboot meanwhile, the issue
seems to be gone.

So, this finally looks like a plain configuration issue triggered by
unclean dependencies. Hence I'll leave this bug open - if you don't like
to tighten the dependencies, feel free to just close it.

Btw... with libasound2 1.0.25-2 and pulseaudio 1.1-3 alsactl, alsamixer
etc. start complaining:
	ALSA lib conf.c:1220:(parse_def) show is not a compound
	ALSA lib conf.c:1686:(snd_config_load1) _toplevel_:24:26:Unexpected char
	ALSA lib conf.c:3406:(config_file_open) /usr/share/alsa/pulse-alsa.conf may be old or corrupted: consider to remove or fix it
However, this is probably more a pulseaudio issue than a libasound one,
even if the contents of the alsa-configs shipped with pulseaudio didn't
really change...


best regards
   Mario
-- 
reich sein heisst nicht, einen Ferrari zu kaufen, sondern einen zu
verbrennen
                                             -- Dietmar Wischmeier

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Message #15 received at 659627-done@bugs.debian.org (full text, mbox, reply):

From: "Mario 'BitKoenig' Holbe" <Mario.Holbe@TU-Ilmenau.DE>

To: 659627-done@bugs.debian.org

Subject: Re: libasound2: stuttering audio due to continuous underruns

Date: Wed, 16 May 2012 16:40:10 +0200

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On Sun, Feb 12, 2012 at 05:50:23PM +0100, Mario 'BitKoenig' Holbe wrote:
> upgrading libasound2 to 1.0.25-2 leads to stuttering audio when playing
> TV via xawtv (3.102-3) and xawtv continuously reporting

This issue seems to be finally gone with pulseaudio 2.0-1.
While it did still occur from time to time up to pulseaudio 1.1-3.2, I
did not notice any occurence since pulseaudio 2.0-1.
Hence, I'm closing this bug.

Probably it has/had something to do with pulseaudio
	commit 8ea6b0585e802490d160814b61d0165b875e0a84
	Revert "resamplers: Optimize trivial resampler"
		This causes problems with 24kHz audio (results
		in echoing) when upscaling to 44.1kHz or 48kHz.
but that's just a wild guess.


regards
   Mario
-- 
Ho ho ho! I am Santa Claus of Borg. Nice assimilation all together!

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