FS#41075 - [alsa-plugins] 1.0.28-1 audio crackling in jack plugin
Attached to Project:
Arch Linux
Opened by Nick Joliat (njoliat) - Thursday, 03 July 2014, 18:52 GMT
Last edited by David Runge (dvzrv) - Tuesday, 08 June 2021, 19:26 GMT
Opened by Nick Joliat (njoliat) - Thursday, 03 July 2014, 18:52 GMT
Last edited by David Runge (dvzrv) - Tuesday, 08 June 2021, 19:26 GMT
|
Details
Description:
When I play audio through ALSA programs when JACK is playing (usings alsa-plugins jack plugin), after a period of normal playback (usually less than 3 minutes) audio starts crackling. This crackling continues indefinitely or until certain events (e.g. pause/play in MPlayer; seems to correspond to JACK graph changes.) I had not observed this problem prior to upgrading to alsa-plugins 1.0.28-1. Additional info: * example of audio crackle: http://njoliat.the-nsa.org/alsa_plugins_issue/alsa_plugins_bug_crackle.wav * same audio without crackle for comparison: http://njoliat.the-nsa.org/alsa_plugins_issue/alsa_plugins_bug_clear.wav * package versions: alsa-plugins 1.0.28-1 alsa-lib 1.0.28-1 ffmpeg 1:2.2.4-1 jack2 1.9.9.5-4 libpulse 5.0-1 libsamplerate 0.1.8-3 libspeex 1.2rc1-4 * other system info: Lenovo T420s soundcard: Intel PCH Conexant CX20590 * I do not observe this behavior if I downgrade alsa-plugins to previous version 1.0.27-2. * tested with ALSA + no JACK (by commenting out /etc/asound.conf), and with JACK programs (e.g. "mplayer -ao jack") and the problem does not occur. * .asoundrc: pcm.dmixout { # Just pass this on to the system dmix type plug slave { pcm "dmix" } } * /etc/asound.conf: pcm.!default { type plug slave { pcm "jack" } } ctl.mixer0 { type hw card 1 } # pcm type jack pcm.jack { type jack playback_ports { 0 system:playback_1 1 system:playback_2 } capture_ports { 0 system:capture_1 1 system:capture_2 } } * output of "aplay -l": **** List of PLAYBACK Hardware Devices **** card 0: PCH [HDA Intel PCH], device 0: CX20590 Analog [CX20590 Analog] Subdevices: 0/1 Subdevice #0: subdevice #0 card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: PCH [HDA Intel PCH], device 7: HDMI 1 [HDMI 1] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: PCH [HDA Intel PCH], device 8: HDMI 2 [HDMI 2] Subdevices: 1/1 Subdevice #0: subdevice #0 * attached: Jackd output (I saw no change in printouts when crackling started) Steps to reproduce: * start jack with e.g. "jackd -d alsa -r 48000" * run mplayer "mplayer -ao alsa [an mp3 or wav at least 3-4 minutes in length]" * listen w/o interrupting playback, usually < 4 min. 
status_jack_output.txt
(25.3 KiB)
|
This task depends upon
Closed by David Runge (dvzrv)
Tuesday, 08 June 2021, 19:26 GMT
Reason for closing: Works for me
Additional comments about closing: This report is for a long outdated version of alsa-plugins.
If the issue persists with a recent version, please open a new ticket.
Tuesday, 08 June 2021, 19:26 GMT
Reason for closing: Works for me
Additional comments about closing: This report is for a long outdated version of alsa-plugins.
If the issue persists with a recent version, please open a new ticket.
Downgrading alsa-plugins to 1.0.27-2 works, but it also brings back the (less annoying) "jack_client_new: deprecated" bug that was fixed in the new version.
There is a small delay added to the audio by using the loopback device, but it's nothing compared to alsa-plugin's annoying random noises.
I thought I'd try 1.0.29-2 on the off-chance that this was fixed, but it looks like it is still a problem.
Since it might be useful for others, I've attched an archive copy of the 1.0.27-2 package that doesn't have this issue.