[Bug 2055842] [NEW] gstreamer: unreliable playback due to pulseaudio bug

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[ Impact ]

gstreamer playback may hang after seeking.
This affects all video/audio players that use gstreamer as their backend.
The cause of the problem is a pulseaudio bug that was fixed in version 16.2

Some upstream bugs are QTBUG-122424, QTBUG-122423,
https://gitlab.gnome.org/GNOME/totem/-/issues/573

Here we backport the relevant patches:
https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/745
https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/764

[ Test Plan ]

1. Open a movie in the Totem video player
2. Seek back and forth for a few minutes
3. Verify that the playback never hung
4. Verify that the audio plays correctly

[ Regression potential ]

libpulse0 is a critical component of Ubuntu Desktop.
It provides the audio interface for all applications.
A bug in libpulse0 may break audio input/output in one or many applications.

** Affects: pulseaudio (Ubuntu)
     Importance: Medium
     Assignee: Alessandro Astone (aleasto)
         Status: In Progress

** Affects: pulseaudio (Ubuntu Noble)
     Importance: Medium
     Assignee: Alessandro Astone (aleasto)
         Status: In Progress

** Affects: pulseaudio (Ubuntu Oracular)
     Importance: Medium
     Assignee: Alessandro Astone (aleasto)
         Status: In Progress


** Tags: patch udeng-4617
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gstreamer: unreliable playback due to pulseaudio bug
https://bugs.launchpad.net/bugs/2055842
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