Clapper is a Linux GTK4 GUI app that gets the GPU to perform hardware acceleration for videos. It has also been adapted to run on the pinephone. Might it be worth a look to see if it could be adapted/ported to Haiku?
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As long as there is no GTK it will hard to do 
There is no GTK port for Haiku. This program relies on the video card drivers to accelerate its video, but it would’nt give us magically “acceleration”, any kind.
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I thought someone was working on a GTK port for Haiku?
Old thread but got as far as launching it with GTK4, playback is still broken (acceleration) though.
Try launching using this one liner and see if it helps GSK_RENDERER=cairo GST_PLUGIN_FEATURE_RANK=glimagesink:NONE,eglglessink:NONE clapper
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Thanks, that worked atleast for audio files playback, Clapper produced sound, for avi,mp4 it still doesn’t though.
Try this one liner instead and see how it goes
GSK_RENDERER=cairo GST_PLUGIN_FEATURE_RANK=glimagesink:NONE,eglglessink:NONE dbus-run-session clapper
(Dbus is available in Haiku ports)
If this does not work then see here Playground (2023-2025) - #62 by KitsunePrefecture
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Still nogo, have been using the trick for dbus-launch for some KDE apps already in the past untill I found out how some can easely be patch to not use it though.
Since dbus-deamon exited with 1 this was expected. I am not familiar with these matters, i am just googling for a solution…nowadays googling is mostly ai assisted so all i do is judge if the solution seems logical​
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No problem, thanks for the suggestions so far, at least I could play music with it 
Not going to be released any time soon, but seeing this is a requirement to be able to build Tuba it’s good to have around here. 
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From the error message, I’d say that something is undefined. It wants to create file monitor but can’t find the type. Problem doesn’t seem with dbus but initialisation of Glib-GIO.
The file monitor message is arround for a long time, also with GTK3.
