** Changed in: gst-plugins-good
Status: Unknown => New
** Changed in: pipewire
Status: Unknown => Fix Released
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https://bugs.launchpad.net/bugs/2056079
Title:
Serious playback timing problems affecting GStreamer and other
pulseaudio and pipewire audio clients
Status in gst-plugins-good:
New
Status in PipeWire:
Fix Released
Status in pulseaudio package in Ubuntu:
New
Bug description:
This is a request for a backport of an existing bug fix, present in
the recent Pulseaudio version 17 release, to the outdated Pulseaudio
16 releases in jammy - noble.
Affects: Ubuntu 22.04.0 LTS and all later versions.
The fix fixes an annoying start of playback timing bug that affects my
own software package octave-psychtoolbox-3 (part of Ubuntu universe),
see
https://github.com/Psychtoolbox-3/Psychtoolbox-3/issues/814#issuecomment-1723827374
which uses GStreamer for video and audio playback. Psychtoolbox is a
very popular toolkit for neuroscience and related medical research,
with Ubuntu as the recommended target distribution. It requires high
reliability in audio and video presentation timing, so the bug
described in the various links below is serious to our users.
The bug also in the same way affects other media applications in
Ubuntu which play back audio via the default (auto-plugged)
pulseaudiosink GStreamer plugin. See GStreamer bug report
https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/1735). The
GStreamer bug turned out to be a pulseaudio client library bug (in
libpulse.so.0).
Any native pulseaudio client is affected, even if pipewire is used as
desktop sound server in recent Ubuntu releases, given that many audio
applications still access pipewire via its pulseaudio frontend
(package pipewire-pulse). See pipewire bug
https://gitlab.freedesktop.org/pipewire/pipewire/-/issues/3399
The bug in libpulse.so.0, reported against Pulseaudio 16 in
https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/issues/1383 has
been fixed for the Pulseaudio 17 release.
See the following merge request for the following trivial one-liner
patch that would need to be backported to Ubuntu's current
implementation:
https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/745/diffs
I hoped that Pulseaudio 17 would be included in Debian in time for
integration into Ubuntu 24.04-LTS, but apparently not much maintenance
of pulseaudio is happening on the Debian side at the moment.
Given that this bug affects all Ubuntu versions since Ubuntu
22.04-LTS, I'd ask kindly for a backport, ideally for Pulseaudio
15.99.1 in 22.04-LTS and Pulseaudio 16.1 in upcoming 24.04-LTS, but at
least for the upcoming 24.04-LTS.
Alternatively it would have been great to get Pulseaudio upgraded to
version 17 for upcoming Ubuntu 22.04-LTS to fix many more bugs, but
apparently that is too late now, according to
https://answers.launchpad.net/ubuntu/+source/pulseaudio/+question/709476
Thanks,
-mario
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