Bug 510311

Summary:	gwenview crashed on mp4 video file play - unsupported VK_KHR_video_decode_queue extension
Product:	[Applications] gwenview	Reporter:	Piotr <piotergmoter>
Component:	general	Assignee:	Gwenview Bugs <gwenview-bugs-null>
Status:	REPORTED ---
Severity:	crash
Priority:	NOR
Version First Reported In:	25.08.1
Target Milestone:	---
Platform:	Manjaro
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Piotr 2025-10-06 17:59:42 UTC

After some recent Manjaro update gwenview crashed when tries to play mp4 videos. It worked fine for the last couple of years on this video files.

This is the error message:
....
[h264 @ 0x562d31e53180] Device does not support the VK_KHR_video_decode_queue extension! 
[h264 @ 0x562d31e53180] Failed setup for format vulkan: hwaccel initialisation returned error. 
Segmentation fault         (core dumped) gwenview

mpv, vlc can play those videos.

but mpv shows me this on console:
...
[ffmpeg/video] h264: Device does not support the VK_KHR_video_decode_queue extension!
...

So I checked 
vulkaninfo | grep -i VK_KHR_video_decode_queue

and nothing. Hm, looks like mesa is not supporting this, but gwenview managed to live with this limitation  and worked previously. 

Operating System: Manjaro Linux 
KDE Plasma Version: 6.3.6
KDE Frameworks Version: 6.18.0
Qt Version: 6.9.2
Kernel Version: 6.12.48-1-MANJARO (64-bit)
Graphics Platform: Wayland
Processors: 16 × 12th Gen Intel® Core™ i5-1240P
Memory: 31,1 GiB of RAM
Graphics Processor: Intel® Graphics

Comment 1 Piotr 2025-10-06 19:21:23 UTC

Update, not only mp4, just tried avi (mjpeg) and no playback,  with this output:
...
[swscaler @ 0x7f0f00011600] deprecated pixel format used, make sure you did set range correctly
qt.multimedia.playbackengine.codec: "No HW decoder found"
[mjpeg @ 0x55d69ebc8e00] Invalid setup for format cuda: missing configuration.
[mjpeg @ 0x55d69ebc8e00] A hardware frames or device context is required for hardware accelerated decoding.
[mjpeg @ 0x55d69ebc8e00] Failed setup for format vaapi: hwaccel initialisation returned error.

Comment 2 Piotr 2025-10-07 20:21:22 UTC

Found the problematic setting in Gwenview which causes the crash: Imageview/Animations/Opengl. When set to Software it works.