Gray lines if videos played with DXVA

[mik9x]

Each time I play a video with DXVA there are these tiny gray lines from bottom left to the right in the top. Any ideas how to fix this issue?

Picture shown is screen grabbed:


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Win 7 64bit
ATI HD5850 Cat 9.10
Windows Media Player, MPC Home Cinema
Sources tried: Divx, Xvid, MP4 h.264 1280x and 1920x

[jagabo]

Are you sure that's not in your source?

How did you prepare that sample image? Photograph the monitor? Print screen?

Is your monitor connected to the computer with a VGA cable or a DVI cable?

[mik9x]

No it is not in the source. And it has nothing to do with the monitor picture or cable. The lines are in the video player picture, in every player which supports DXVA and where it is enabled. Here is another one: https://forum.videohelp.com/images/imgfiles/IjPzd.jpg The lines are smaller if the video source has higher resolution too.

[poisondeathray]

So if you use software decode instead of DXVA, the lines are gone?

What format is your source video? Use mediainfo if you don't know

[mik9x]

Yes when I use software encode the lines are gone, only when I activate DXVA they are there, I tested Windows Media Player, MPC Home Cinema and Power DVD. All have the same lines when using DXVA, tested both DXVA1 and 2 media (Xvid and H264).

I also noticed when using DXVA there is some sort of brightness auto adjust, could it be? You can see it when the movie scene changes between different bright scenes the picture is for a few ms brighter and it adjusts back some sort, that's somehow annoying -.-

[poisondeathray]

Again, what is your source video format?

Is it DXVA compliant?

Have you tried other videos or do the artifacts occur with every video?

[mik9x]

Again, what is your source video format?

Is it DXVA compliant?

Have you tried other videos or do the artifacts occur with every video?

Already said. All have the same lines when using DXVA, tested both DXVA1 and 2 media (Xvid and H264). <- It does not matter what codec the source has I tested different including Xvid and MP4 H264 1080p, the lines are on every source.

[poisondeathray]

You're missing my point. Not all videos are DXVA compliant.

For example, xvid is not. So if you see those lines were observed with an xvid video, something else is wrong.

Only h.264, VC-1, and MPEG-2 are accelerated. And even then, only certain types are, not everything.

eg. If you have a certain number of reference frames for h.264, or above a certain AVC level, it becomes non-complaint and not accelerated. If you have non compliant buffer settings => not compliant...etc... etc...

[mik9x]

OK, DXVA compliant or not. Watching a Xvid file with MPC does not show up the lines, if I use Windows Media Player there are there. If I watch a h264 source with Windows Media Player these lines are there, same with MPC when using DXVA. So?

[jagabo]

It's probably a driver issue. Try different video renderers in MPC or MPCHC. View -> Options -> Playback -> Output... Try the different DirectShow renderers. You have to exit and restart MPCHC for changes to take effect.

Regarding brightness changes, go to the graphics cards advanced setup and disable any video processing features like auto contrast.

[mik9x]

It's probably a driver issue. Try different video renderers in MPC or MPCHC. View -> Options -> Playback -> Output... Try the different DirectShow renderers. You have to exit and restart MPCHC for changes to take effect.

Regarding brightness changes, go to the graphics cards advanced setup and disable any video processing features like auto contrast.

O M G ... ?

It maybe sounds crazy, but I wanted to solve this "auto contrast" thing, so I went into Catalyst Control Center, to Avivo Video, and there I found the option "dynamic contrast" and I deactivated it. And now what? The lines are gone...... I mean, lol? I tried and activated it -> lines again, deactivated -> lines gone. The pictures is crystal clear now, no lines no artifacts... -.- Is it maybe a driver issue or only on my computer?

[jagabo]

It maybe sounds crazy, but I wanted to solve this "auto contrast" thing, so I went into Catalyst Control Center, to Avivo Video, and there I found the option "dynamic contrast" and I deactivated it. And now what? The lines are gone...... I mean, lol? I tried and activated it -> lines again, deactivated -> lines gone. The pictures is crystal clear now, no lines no artifacts... -.- Is it maybe a driver issue or only on my computer?

It's a driver issue.

[Perplexer]

I had the exact same problem and Google took me to this thread when searching for solutions. I'm on Windows 7 using ATi Radeon HD5770 gfx card. The video works ok if I have DirectShow Video set to "System default" in Media Player Classic Homecinema. But when I set it to "EVR Custom Pres" to activate DXVA, then I get those gray lines in every type of video (H264, XViD, ...). Disabling "dynamic contrast" in Catalyst Control Center solved the problem with the lines in "EVR Custom Pres" / DXVA mode and also the annoying auto contrast adjustment problem.

Thanks for figuring this one out guys.