Congratz on the publishing. :-)

I don’t know how to do a screenshot of the entire window that scrolls outside the view… i know skill issues. :D Well in Flatseal some relevant settings are X11 windowing system = ON, Wayland windowing system = OFF, Fallback to X11 windowing system = OFF. GPU acceleration = ON:

• xlsclients returns “freetube”
• With the enabled acceleration features using cmdline: “Media” activity is active (as soon as I play a video)
• Without the extra features: “Media” activity is 0%

Unfortunately if I enable Wayland (just reverse ON / OFF X11 and Wayland setting in Flatseal), the Media activity is unused. Following settings and results are…

X11 windowing system = OFF, Wayland windowing system = ON, Fallback to X11 windowing system = OFF. GPU acceleration = ON:

• xlsclients returns “” (empty)
• With the enabled acceleration features using cmdline: “Media” activity is 0%
• Without the extra features: “Media” activity is 0%

For whatever reason the arguments got additional quotation marks 'run --branch=stable' which messed up the command… deleting the quotation marks runs fine now. Weird… probably a bug from KDE when I tried to add the other options. Well thanks, now it runs with the original shortcut again. Thanks for the screenshot, helped me seeing the issue instantly.

I don’t know why, but the shortcut in the “Start” menu of KDE does not longer start FreeTube… Its Command-line arguments is 'run --branch=stable' --arch=x86_64 --command=/app/bin/run.sh --file-forwarding io.freetubeapp.FreeTube @@u %u @@ . I have uninstalled FreeTube, deleted the shortcut so it is created from scratch and still does not start. It only starts from either commandline with regular flatpak command, or when I create a new shortcut with the arguments run io.freetubeapp.FreeTube --enable features=AcceleratedVideoDecodeLinuxZeroCopyGL,AcceleratedVideoDecodeLinuxGL,VaapiIgnoreDriverChecks,VaapiOnNvidiaGPUs

I think I found it. Didn’t bother to look this up until your post and can confirm by default the “Media” is not utilized. Looking into a bug report about exactly that from Feb, 2025 (a year ago from now) https://github.com/FreeTubeApp/FreeTube/issues/6786 the developer says a set of flags is needed to pass in and a user suggests following: https://github.com/FreeTubeApp/FreeTube/issues/6786#issuecomment-2832299878

flatpak run io.freetubeapp.FreeTube --enable-features=AcceleratedVideoDecodeLinuxZeroCopyGL,AcceleratedVideoDecodeLinuxGL,VaapiIgnoreDriverChecks,VaapiOnNvidiaGPUs

I can confirm this will use some “Media” activity. But comparing (unscientifically) the GPU and GFX in fdinfo, the utilization doesn’t seem too different. So overall I am not sure if that is actually hardware acceleration. Also make sure FreeTube has permission for “GPU acceleration” under “Device” set with Flatseal.

The sad thing is, they had support for Linux in the past. And I mean not only making the launcher run on Linux, but with Linux builds of games:

OS X and Linux support

In October 2012, GOG.com announced support for OS X. They included the previously Steam exclusive (OS X version) The Witcher and The Witcher 2, both made by CD Projekt Red. GOG.com gathered user feedback in a community wishlist, and one of the most demanded feature requests was support for native Linux games, which gathered close to 15,000 votes before it was marked as “in progress”.[20] Originally GOG.com representatives said, that there are technical and operational issues which make it harder than it seems,[21] however it’s something they would love to do, and they have been considering.[22] On 18 March 2014, GOG.com officially announced that they would be adding support for Linux, initially targeting Ubuntu and Linux Mint in the fall of 2014.[23] On 25 July 2014, Linux support was released early, and 50 games were released compatible with the operating system.[24]

– https://en.wikipedia.org/wiki/GOG.com#OS_X_and_Linux_support

Winslop!