Ugly horizontal video artifacts on some movies

giaur500 · Published in 2016-5-16 14:43:34

Hello,

For some movies (mostly dvb-t streams from tvheadends, no matter hd or sd), I'm expriencing ugly horizontal video artifacts. Especially, on dynamic scenes. Is this known issue? I tried to play with video options (refresh rat/frame rate) but still no luck. Is it any known issue? I can post test video (if it helps).

Dima · Published in 2016-5-16 14:47:51

I think I know what you're talking about, you're on the latest image, right? (2015/10/05) Probably related to mali driver. I think that jernej reverted it, but I didn't have the chance to test it yet.

giaur500 · Published in 2016-5-16 14:48:46

Dima replied at 2016-5-16 14:47
I think I know what you're talking about, you're on the latest image, right? (2015/10/05) Probably r ...

Yes, latest image. Is it ok on previous one?

Dima · Published in 2016-5-16 17:22:09

Edited by Dima at 2016-5-16 17:23

Should be fine with 28/04, yes.
http://down.nu/images/2016-04-28/

However, please note that from this image, you will need to update through .tar method as OTA wasn't implemented yet in this image.

giaur500 · Published in 2016-5-16 22:31:09

Dima replied at 2016-5-16 17:22
Should be fine with 28/04, yes.
http://down.nu/images/2016-04-28/

Ok... there is no .tar image for 04.28. Not nice :/ Can't downgrade, need to play with make copy of my files and copy them back after dd finishes

giaur500 · Published in 2016-5-16 23:40:19

Edited by giaur500 at 2016-5-17 00:17

Nope... 04-28 build has the same issue. Try to play this test file:

https://mega.nz/#!nQ1FSDAB!q2oFV7gXAmRslwEqHJHsUTOoFHwvvZAkEISI81cY2Js

Horizontal artifacts causes all of that useless...

@jernej ?

jernej · Published in 2016-5-16 23:56:05

Well, then I guess you mean video playback artifacts due to not implemented V-Sync. This is usually visible on interlaced videos, but sometimes also on progressive (e.g. not interlaced) ones. There is no quick fix for that. I will address this in new render code, but it will take a while to implement it.

BTW, support for update (tar) files was added only recently.

Dima · Published in 2016-5-17 00:08:13

Yup, I also checked the file and I'm certain it's just a typical vsync error. BTW: VLC shows resolution as 1920x1090. Maybe that's part of the issue?
Nothing in common with the mali issue.

I also have the tearing on my "stable" OpenELEC build (from february).

giaur500 · Published in 2016-5-17 00:19:10

jernej replied at 2016-5-16 23:56
Well, then I guess you mean video playback artifacts due to not implemented V-Sync. This is usually ...

Any chance for that in next build? @Dima - vlc shows it wrong... video is 1920x1080i

jernej · Published in 2016-5-17 00:31:25

Edited by jernej at 2016-5-16 17:37

giaur500 replied at 2016-5-16 17:19
Any chance for that in next build? @Dima - vlc shows it wrong... video is 1920x1080i

If you want to wait few weeks, then yes. But I guess I will upload at least one intermediate build. This code is really non trivial.

EDIT: You are both right. If you check VLC info again, you will see listed both resolutions. One is the resolution of the usable (visible) part and another is actually encoded resolution, which is usually used due to codec limitations/optimizations.