[kde] [Bug 476602] New: Gstreamer's pipewiresrc capturing from XDG screencast portal produces a black screen on Wayland

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=476602

            Bug ID: 476602
           Summary: Gstreamer's pipewiresrc capturing from XDG screencast
                    portal produces a black screen on Wayland
    Classification: I don't know
           Product: kde
           Version: unspecified
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: kde at copper.lt
  Target Milestone: ---

Created attachment 162886
  --> https://bugs.kde.org/attachment.cgi?id=162886&action=edit
Test python script that shows either the capture screen (works) or black window
(doesn't work)

SUMMARY
Getting the `streamID` & `filedescriptor` parameters from the
org.freedesktop.portal.ScreenCast portal and then using a gstreamer pipeline
with `pipelinesrc` and the aforementioned `streamID` & `filedescriptor`
parameters produces a black screen instead of the contents the stream should be
capturing.

Why I think it is a KDE Plasma issue: I am running an atomic distribution
(rpm-ostree based), rebased on Gnome, and the test script works. Everything
else besides the DE is the same.


STEPS TO REPRODUCE
1. Run test script via `python3 xdp-screen-cast.py`
2. Select which screen/window to share in the Screen share popup 
3. Observe the demo window which has opened

OBSERVED RESULT
Demo window shows all-black

EXPECTED RESULT
Demo window shows the contents of the capture

SOFTWARE/OS VERSIONS

Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 5.27.8
KDE Frameworks Version: 5.110.0
Qt Version: 5.15.11

Using NVIDIA GPU, but like I said, the same works on Gnome.

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