https://bugs.kde.org/show_bug.cgi?id=445631
Bug ID: 445631
Summary: GStreamer with waylandsink: No video shown when
rendered to child widget in Plasma Wayland session
(works in Weston)
Product: kwin
Version: 5.23.3
Platform: Debian testing
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: m.wegh...@posteo.de
Target Milestone: ---
Created attachment 143652
--> https://bugs.kde.org/attachment.cgi?id=143652&action=edit
Sample program to reproduce the issue
SUMMARY
When using GStreamer's "waylandsink" to play a video, the video does not show
if rendered to a widget that is a child widget when run in a KDE Plasma Wayland
session using KWin as Wayland compositor. It works fine when using a nested
Weston instead.
STEPS TO REPRODUCE
1. make sure that gstreamer-plugins-bad and the GStreamer headers are installed
2. download and extract attached sample program
3. build the program using Qt6 (the program is more broken when using Qt 5;
note: include paths might have to be adapted in the .pro file):
.../path/to/qt6/qmake
make
4. run the sample program
./waylandsink
5. look at the program's window.
OBSERVED RESULT
The window content is blank, no video is shown.
EXPECTED RESULT
The GStreamer test video should show up, as is e.g. the case when running the
sample program in Weston (screencast will be attached.)
SOFTWARE/OS VERSIONS
Operating System: Debian GNU/Linux
KDE Plasma Version: 5.23.3
KDE Frameworks Version: 5.86.0
Qt Version: 5.15.2
Kernel Version: 5.14.0-4-amd64 (64-bit)
Graphics Platform: Wayland
Processors: 12 × Intel® Core™ i7-9850H CPU @ 2.60GHz
Memory: 62.4 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics 630
ADDITIONAL INFORMATION
* This still happens with the fix for bug 445346 in place.
* The sample program "doesn't work at all" when compiled against Qt 5 instead
of Qt 6, no window shows up at all.
* I've used a self-compiled qtbase (as of commit 6652bf2353) and qtwayland (as
of 6a7b8402) from the Qt 6 "dev" branch.
* The video is shown just fine when the widget that the video is rendered to
does not have a parent widget (s. commented out code in main.cpp in the sample
project).
* sample program is based on https://github.com/woutervanh/qt-waylandsink-demo
* original/actual use case is making video rendering in LibreOffice Impress
work for the qt6 integration when run on Wayland
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