Hi,

The environment
Kdenlive Version 18.08.3
MLT version 6.10.0
FFmpeg libraries
KDE Frameworks 5.52.0
Qt 5.11.2 (built against 5.11.2)
The xcb windowing system

Operating system: Arch Linux
GPU: GeForce GTX 1050 Ti

The issue
In order to make us of the GPU, I actived Settings --> Configure Kdenlive --> Playback --> Use GPU processing (Movit library) (and restarted Kdenlive).

But in the very moment, when I want to playback my movie, Kdenlive crashes and I have following error-message in the terminal

GL error 0x501 (GL_INVALID_VALUE) at filter_glsl_manager.cpp:465
Abgebrochen (Speicherabzug geschrieben)

I have no glue how to approach this problem, and would be very grateful for any kind of tips, hints, etc.

Unfortunately, Movit (GPU acceleration) is not stable. See here: https://bugs.kde.org/show_bug.cgi?id=380019
Disable it for the time being.
It's not clear by when Nvidia acceleration can be implemented.