You are not logged in.

#1 2009-05-23 02:02:01

jlcordeiro
Member
From: Portugal
Registered: 2009-05-23
Posts: 76

[solved] Video pixelization

Hi guys, I have a little problem with video playback.

All players I tested on my archlinux setup, result in a huge pixelization issue, and i cant figure whats the problem.

Weird thing is, playing some video in smplayer results in the pixelization, but if i screenshot it (with smplayer), the screenshot comes out clean.

Can any of you tell me what the problem is?


I uploaded one image to show my problem. On the left side you have ristretto with the (clean) screenshot, and smplayer playing the video on the right.
15567f62009052302.png


PS: This happens with all my video files, mainly in dark frames.
PS2: I just tested it with an ubuntu live cd and smplayer did ok.

Last edited by jlcordeiro (2009-05-28 00:21:42)

Offline

#2 2009-05-23 12:21:29

R00KIE
Forum Fellow
From: Between a computer and a chair
Registered: 2008-09-14
Posts: 4,734

Re: [solved] Video pixelization

I can't see any difference ....


R00KIE
Tm90aGluZyB0byBzZWUgaGVyZSwgbW92ZSBhbG9uZy4K

Offline

#3 2009-05-23 13:15:40

graysky
Wiki Maintainer
From: :wq
Registered: 2008-12-01
Posts: 10,595
Website

Re: [solved] Video pixelization

Yeah... left and right look the same to me...??


CPU-optimized Linux-ck packages @ Repo-ck  • AUR packagesZsh and other configs

Offline

#4 2009-05-23 13:42:24

jlcordeiro
Member
From: Portugal
Registered: 2009-05-23
Posts: 76

Re: [solved] Video pixelization

Right image is full of noise (top, the black sky is full of blue-ish squares.

Easy to notice on the left of the images, near the tree. And in fullscreen, that noise really does make a difference

Offline

#5 2009-05-23 14:08:30

Procyon
Member
Registered: 2008-05-07
Posts: 1,819

Re: [solved] Video pixelization

I only see a difference with very high brightness and gamma.

Offline

#6 2009-05-23 14:50:39

R00KIE
Forum Fellow
From: Between a computer and a chair
Registered: 2008-09-14
Posts: 4,734

Re: [solved] Video pixelization

Did you try to change the post-processing level?


R00KIE
Tm90aGluZyB0byBzZWUgaGVyZSwgbW92ZSBhbG9uZy4K

Offline

#7 2009-05-23 15:35:05

jlcordeiro
Member
From: Portugal
Registered: 2009-05-23
Posts: 76

Re: [solved] Video pixelization

Cant be that, because it happens with all the players (but only at archlinux, ubuntu is ok with same files/players/configs)

I would put my money either on codecs or NVIDIA drivers.
But I installed both reading wiki, to make sure i did everything right.


I just remembered that trying it with a real DVD could give me some clues.
Ill try a game too, to check if dark scenes have those problems.

Ty for your help, Ill come back with some more clues asap.

Offline

#8 2009-05-23 17:02:48

jlcordeiro
Member
From: Portugal
Registered: 2009-05-23
Posts: 76

Re: [solved] Video pixelization

I took a screenshot of a fullscreen video, to better show my problem.

95f1a06a2ffs.png

Offline

#9 2009-05-23 17:50:14

graysky
Wiki Maintainer
From: :wq
Registered: 2008-12-01
Posts: 10,595
Website

Re: [solved] Video pixelization

@jlcordeiro - my lcd must not be calibrated correctly.  All I see in your pic is black smile


CPU-optimized Linux-ck packages @ Repo-ck  • AUR packagesZsh and other configs

Offline

#10 2009-05-23 20:11:50

benob
Member
Registered: 2008-11-11
Posts: 187

Re: [solved] Video pixelization

graysky wrote:

@jlcordeiro - my lcd must not be calibrated correctly.  All I see in your pic is black smile

same here. deep black.

Offline

#11 2009-05-23 21:23:01

skottish
Forum Fellow
From: Here
Registered: 2006-06-16
Posts: 7,942

Re: [solved] Video pixelization

If your games turn out correct, try and change the output drivers of your players. I don't know what the defaults are for different software, but I do know, for instance, that the gl driver is painfully bad on nVidia cards.

Offline

#12 2009-05-25 05:05:31

Intrepid
Member
Registered: 2008-06-11
Posts: 254

Re: [solved] Video pixelization

First of all, this pixellation, believe it or not, is simply bound to happen due to the nature of video codecs!  I did see the dark grey "pixels" in the circled area.  If you don't like it, enable deinterlace and other post-processing effects.

Totem: view, deinterlace
Gxine:View, deinterlace, configure plugins, deinterlace, tvtime.  This helps a LOT.  If not enough, turn on denoise3d under post-processing plugins.


Intrepid (adj.): Resolutely courageous; fearless.

Offline

#13 2009-05-25 10:43:08

R00KIE
Forum Fellow
From: Between a computer and a chair
Registered: 2008-09-14
Posts: 4,734

Re: [solved] Video pixelization

Deinterlace shouldn't be used if the source is not interlaced although it may help depending on the deinterlace algorithm, it may be doing some kind of temporal smooth or blending two adjacent frames instead of taking both image fields and doing a proper deinterlace (which would make it look worse I guess in case the video is not interlaced).


R00KIE
Tm90aGluZyB0byBzZWUgaGVyZSwgbW92ZSBhbG9uZy4K

Offline

#14 2009-05-27 01:58:00

jlcordeiro
Member
From: Portugal
Registered: 2009-05-23
Posts: 76

Re: [solved] Video pixelization

Hmm...

cross-checked arch and ubuntu. Same options, same issue (with arch, only)

on top of that, call of duty running through wine, results in the same problem.


Ill try with a linux game asap, but I guess the problem is definitely a graphic card one...


PS: deinterlace didn't help

Offline

#15 2009-05-28 00:28:47

jlcordeiro
Member
From: Portugal
Registered: 2009-05-23
Posts: 76

Re: [solved] Video pixelization

yeah... it's always something stupid isn't it?

After realizing this was a graphic card issue (and not codecs), I started to think what could cause something like that. It didn't have enough colors to make a smooth black/gray gradient.

I checked nvidia-settings, and that was it, wrong color depth smile


Thank you all, and sorry for such a (not) problem.

Offline

Board footer

Powered by FluxBB