topic Re: Stair-case artifact while playing video with hardware decoding enabled on Skylake in Graphics

Stair-case artifact while playing video with hardware decoding enabled on Skylake

CChad1 — Fri, 14 Oct 2016 17:42:02 GMT

I have a Thinkpad that came with i7-6700HQ CPU. I wanted to take advantage of the hardware decoding feature on skylake. I use PotPlayer as my primary video player to play videos. Whenever I use software decoding, videos play without any visual artifact. If I turn on hardware decoding, I start seeing a staircase as can be seen on the image below. Is this a driver issue? Can anyone confirm it?

Some info on the video I was playing:

Format : HEVC

Format/Info : High Efficiency Video Coding

Format profile : Main@L4@Main

Codec ID : V_MPEGH/ISO/HEVC

Width : 1 920 pixels

Height : 1 080 pixels

Display aspect ratio : 16:9

Frame rate mode : Variable

Original frame rate : 23.976 FPS

Color space : YUV

Chroma subsampling : 4:2:0

Bit depth : 8 bits

Re: Stair-case artifact while playing video with hardware decoding enabled on Skylake

idata — Mon, 17 Oct 2016 18:54:01 GMT

Hello medwatt,

Please try uninstalling the graphics driver to see how it goes and then reinstall it, please see http://www.intel.com/content/www/us/en/support/graphics-drivers/000005598.html?wapkw=intel+display+audio Uninstalling the Intel® Graphics Driver and Intel® Display HDMI/Audio Driver, once you uninstall this driver go ahead and restart your system and then reinstall the latest Beta driver that Intel has released, you can download it here:

https://downloadcenter.intel.com/download/26305/Intel-Beta-Graphics-Driver-for-Windows-10-and-Windows-7-8-1-15-40-?product=88345 Intel® Beta Graphics Driver for Windows® 10 and Windows 7*/8.1* [15.40]

Best wishes,

Ivan

Re: Stair-case artifact while playing video with hardware decoding enabled on Skylake

JGali5 — Mon, 17 Oct 2016 19:20:59 GMT

This is not going to solve installing / re-installing graphics driver. This is a BUG of all recent graphics driver related to video post-processing "enhancements".

Is addressed by disabling ALL image enhancements in Graphics Settings > Video (contrast enhancement, etc.) Set ALL (basic and advanced) properties to DISABLED or APPLICATION CONTROLLED.

Some settings are re-enabled by default when a driver is updated or reinstalled (another bug).

Re: Stair-case artifact while playing video with hardware decoding enabled on Skylake

idata — Wed, 19 Oct 2016 19:44:28 GMT

Hi,

Please fill out the information at the following link for better assistance:

/thread/77761 https://communities.intel.com/thread/77761

Once you fill out the information please post it here.

Thanks,

Ivan

Re: Stair-case artifact while playing video with hardware decoding enabled on Skylake

CChad1 — Thu, 20 Oct 2016 01:24:17 GMT

I bought a new SSD today and I installed Windows 10 on it. I checked Lenovo's website and downloaded the latest video drivers for my Thinkpad P50. Surprisingly, the staircases have vanished. I really don't know whether it was a drivers issue or OS issue. I'm just happy it's gone.

Re: Stair-case artifact while playing video with hardware decoding enabled on Skylake

idata — Thu, 20 Oct 2016 17:14:33 GMT

That's great and I really thank you for taking your time to let me know about it, I hope you can have a good experience with the unit from now on.

Best wishes,

Ivan

Re: Stair-case artifact while playing video with hardware decoding enabled on Skylake

JGali5 — Thu, 20 Oct 2016 17:23:38 GMT

I not need Intel support... Intel needs fix this bug.

That's all.

(If a Intel developer reads this post will know how to reproduce and how to fix)

Re: Stair-case artifact while playing video with hardware decoding enabled on Skylake

JGali5 — Thu, 20 Oct 2016 20:03:24 GMT

Google search reveals it's not a "single case" issue.

Example:

http://forum.kodi.tv/showthread.php?tid=278799 DXVA2 and Hevc

http://forum.kodi.tv/showthread.php?tid=292328 HEVC playback with staircase effect

http://forum.kodi.tv/showthread.php?tid=266656 Artefacts with HEVC videos

Re: Stair-case artifact while playing video with hardware decoding enabled on Skylake

idata — Thu, 20 Oct 2016 21:55:05 GMT

Please try installing the latest Beta driver, you can download it here:

https://downloadcenter.intel.com/download/26347/Intel-Beta-Graphics-Driver-for-Windows-10-and-Windows-7-8-1-15-40- https://downloadcenter.intel.com/download/26347/Intel-Beta-Graphics-Driver-for-Windows-10-and-Windows-7-8-1-15-40-

Regards,

Ivan