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Upscaling is blocky/missing AA
Posted: 18 Jul 2021 03:20
by Arp
Hello,
I'm not sure how to describe it.
Here is a screenshot.
Ever sine I got the new AMD 6900XT I have the feeling that there is Antialiasing missing, or something.
Even in VLC.
I attached a screenshot.
You can see at her shoulders that it's quite "blocky". Granted, this is upscaled from DVD to 1440p within VLC, but I would have assumed it could do better than that.
https://imgur.com/a/2yHzFjV
I tried several modes in the upscaling filter page of the advanced options. Nothing seemed to changed.
So, could this be an issue with VLC, or AMD, or is it just not possible to get it better?
Thanks!
Re: Upscaling is blocky/missing AA
Posted: 18 Jul 2021 09:45
by Rémi Denis-Courmont
The upscaling filter? Normally, VLC lets OpenGL (or the display server) take care of upscaling in the GPU.
Re: Upscaling is blocky/missing AA
Posted: 20 Jul 2021 12:24
by Arp
Then there might be a bug in opengl? Or the radeon driver sucks? Because it looks much better if I set the video from Automatic or Opengl to XCB...
Here is more or less the same frame with X11 XCB instead of opengl.
https://imgur.com/a/QQctEma
Re: Upscaling is blocky/missing AA
Posted: 20 Jul 2021 17:12
by Rémi Denis-Courmont
In principles, it could be either, but it's somewhat unlikely that the OpenGL output would have such an obvious bug unnoticed until now.
Re: Upscaling is blocky/missing AA
Posted: 19 Sep 2022 13:24
by Arp
Hey,
I just wanted to say that this is still present in Linux Mint 21 and vlc 3.0.16.
I tried it with the built in player called celluloid and this does not seem to have this upscaling issue. But I don't know if it uses opengl or not.
Re: Upscaling is blocky/missing AA
Posted: 19 Sep 2022 13:35
by Arp
I just played around with more settings and the scaling is fine when I go into all settings, then to opengl and change the opengl extension to GLX and change the OpenGL/GLES hardware converter from automatic to "VA-API OpenGL surface converter for X11"
I have no idea what those things mean, I was just playing around, but this seems to fix the issue.
Re: Upscaling is blocky/missing AA
Posted: 19 Sep 2022 17:41
by Rémi Denis-Courmont
Sounds like your GPU drivers are seriously broken.
Re: Upscaling is blocky/missing AA
Posted: 20 Sep 2022 17:37
by Arp
It's a fresh installation with 5.15 kernel.I kept reading that all necessary amd drivers are already in the kernel, so I did not install any external drivers.
Re: Upscaling is blocky/missing AA
Posted: 29 Sep 2022 17:17
by rom1v
> Granted, this is upscaled from DVD to 1440p within VLC
Bilinear upscaling (like applied by OpenGL) has poor quality for such a big upscaling.
On VLC 4 development branch, you can enable some better upscaling filters (at the cost of performance):
https://code.videolan.org/videolan/vlc/ ... quests/905