https://bugs.documentfoundation.org/show_bug.cgi?id=145735
Bug ID: 145735
Summary: qt6: Support video playback in Impress presentations
on Wayland
Product: LibreOffice
Version: 7.3.0.0 alpha0+ Master
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: medium
Component: UI
Assignee: [email protected]
Reporter: [email protected]
see tdf#125219 for qt5/kf5
Steps to reproduce
0) Use qt6 VCL plugin in a Plasma Wayland session
1) open a presentation containing a video in Impress (e.g. attachment 145517
[details] from bug 120452)
2) start slide show by pressing F5
As of now, video is not shown properly. qt5/kf5 use GStreamer's
"qwidget5videosink", but that one is not available for Qt 6 and will probably
not be ported for qt6. From commit message of the commit that introduced the
qt6 VCL plugin:
> commit 88d57cf241209ffec9eaed3e523942ab51af6db6
> Author: Michael Weghorn <[email protected]>
> Date: Wed Sep 29 11:09:51 2021 +0200
>
> qt6: Add a qt6 VCL plugin
>
> [...]
>
> 6) There's currently no Qt 6 video sink for GStreamer.
> As of today, qt-gstreamer is unmaintained and there is no Qt 6 version.
> The project's README [2] says:
>
> > 0. Maintenance Notice
> > ---------------------
> >
> > This code is unmaintained. You can use it at your own risk.
> >
> > If you want to integrate video display in your QML-based UI,
> > you should consider using 'qmlglsink', from gst-plugins-good.
> > This is a well supported video sink that uses the generic
> > gstreamer-gl stack and is in many ways superior to 'qtquick2videosink'
> > that is provided by qt-gstreamer. You can use this code as an example:
> >
> https://cgit.freedesktop.org/gstreamer/gst-plugins-good/tree/tests/examples/qt/qmlsink
> >
> > If you are not interested in using QML in your UI, then you
> > may use one of the other elements provided by this module
> > (see below). If you do that, it would be helpful to let us
> > know that this code is still useful to you. We may consider
> > adding these elements in one of the core gstreamer modules.
> >
> > If you are here for the Qt-style bindings, I'm sorry to disappoint you.
> > The alternative is to use the C API, or the GStreamermm C++ API.
> > Qt-style bindings are cool, but unfortunately they are very hard
> > to maintain because they are written by hand. If you are interested
> > in continuing this project, you are welcome to implement a
> > generator for them, probably based on GObject-Introspection.
> > I am happy to provide directions if you want to pursue such a thing.
>
> Therefore, the Qt video sink handling is qt5-only and the
> corresponding handling for GOBJECT (used for the GStreamer
> video sink handling) was not taken over for qt6.
>
> This presumably means that video playback in Impress presentations
> does not work when using qt6 with they Qt Wayland plugin,
> s. tdf#125219 for the corresponding bug for qt5/kf5.
> (I did not build the qtwayland module to actually test this, though.
> Video playback with the Qt xcb plugin in a Wayland session works.)
>
> [1] https://doc-snapshots.qt.io/qt6-dev/extras-changes-qt6.html
> [2] https://cgit.freedesktop.org/gstreamer/qt-gstreamer/tree/README
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