Bug 488768

Summary:	VLC video playback is glitchy
Product:	[I don't know] kde	Reporter:	Wilbur Jaywright <zargulthewizard>
Component:	general	Assignee:	Unassigned bugs mailing-list <unassigned-bugs>
Status:	RESOLVED FIXED
Severity:	normal	CC:	danfrantes, nate
Priority:	NOR
Version:	unspecified
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed In:	6.1.0
Sentry Crash Report:

Description Wilbur Jaywright 2024-06-20 03:17:56 UTC

SUMMARY
When playing a video in VLC with the output set to automatic (in Wayland), it jumps backwards two or three times a seconds for just an instant. This results in a flickering effect.

STEPS TO REPRODUCE
1. Use Wayland.
2. Have VLC media player.
3. Play a video with VLC.

OBSERVED RESULT
The video stammers.

EXPECTED RESULT
The video plays continuously.

SOFTWARE/OS VERSIONS
Windows: X
macOS: X
Linux/KDE Plasma: Fedora 40 x64
(available in About System)
KDE Plasma Version: 6.0.5
KDE Frameworks Version: 6.3.0
Qt Version: 6.7.1

ADDITIONAL INFORMATION
I am using NVidia graphics with the proprietary drivers.

Comment 1 daniel 2024-06-20 07:44:20 UTC

Hello,
thank you for report. Please try to disable or remove your proprietary driver's. If it will work as expected, it will be upstream bug.

Thank you

Daniel

Comment 2 Wilbur Jaywright 2024-06-20 14:36:07 UTC

I uninstalled akmod-nvidia and rebooted. The problem persists. However, I still have VRAM reports? That has never happened before when the drivers were not working.

Comment 3 Nate Graham 2024-06-21 02:22:16 UTC

Is there any reason to suspect this is anything other than a VLC issue?

Comment 4 Wilbur Jaywright 2024-06-21 02:28:38 UTC

I honestly don’t know. I have no idea how Wayland works and I’m not sure what level it is at, I just know X support is dying in Fedora spin KDE to the point where it is now far worse than Wayland, and I need this to work. Everyone involved can say “wrong department” and I won’t know if they’re wrong, but I won’t know who to talk to.

Comment 5 Nate Graham 2024-06-21 18:25:07 UTC

Talked with a KWin developer, and apparently this should be fixed with Explicit Sync in Plasma 6.1, in conjunction with the version 555 or later of the proprietary  NVIDIA driver.

Comment 6 Wilbur Jaywright 2024-06-21 18:54:07 UTC

All right, thank you. I just got the 6.1 update working today, apparently there was a conflict with some X 11 packages. Nice to know this is fixed at the same time X 11 is officially dead for me.