Hardware Decoding with Skylake

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Hardware Decoding with Skylake

Post by bamboozlr on Sat Feb 04, 2017 2:48 pm

I have an i7-6700K and a GTX 1060 (6 GB) GPU. I use the K-Lite Codec Mega Pack version 12.8.5. My OS is Windows 8.1 64-bit.

My CPU should support HEVC hardware decode for 8-bit colour depth. When I go into the LAV video settings, HEVC, HEVC10 (logically), MPEG-4 and VP9 are greyed out. The last three I don't really care about, but the first I do find necessary.

Per default, the hardware decoder is set to DVXA2 copyback. It does support hardware decoding via my GPU, and MPC-HC confirms that by saying "[H/W] Playing" in the bottom left. Sadly, that gives me pretty bad playback stuttering, which is why I wanted to go for my CPU's hardware decoding. I already tried plugging my DVI cable into the mainboard directly, instead of the GPU, but that didn't help. All that was possible was to tell DVXA2 to use the Intel Graphics thing instead, which only made things much worse. QuickSync doesn't allow me to use HEVC hardware decoding. Am I doing something silly? I can hardware encode with it in TMPGEnc just fine, and set my BIOS to "Auto" for choosing between the iGPU and dedicated GPU.

Thanks for your time.

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Re: Hardware Decoding with Skylake

Post by Admin on Sun Feb 05, 2017 1:46 pm

The QuickSync decoder in LAV does not support HEVC (regardless of your hardware). It should not be used. DXVA2 works with ALL brands of GPUs, including Intel.

If you use DXVA2 copy-back, then there is a dropdown box below it where you can select the desired GPU. You can select your Intel one there. You can also customize which GPU is used for a specific application in your NVIDIA control panel.

But a GTX 1060 should have no issues at all with HEVC. That also supports 10-bit.

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Re: Hardware Decoding with Skylake

Post by bamboozlr on Sun Feb 05, 2017 3:20 pm

Thanks for your response.

I know it shouldn't have any issues, but for some reasons, it did. Good to know that the QuickSync decoder doesn't support HEVC. I did select my Intel internal graphics in that dropdown box, but it caused massive CPU load and made playback more cumbersome than software decoding. Don't understand why my CPU can't do its regular hardware decoding.

Guess I'm stuck with software decode then. Thanks nonetheless.

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Re: Hardware Decoding with Skylake

Post by Admin on Mon Feb 06, 2017 12:26 am

Try this setting:
NVIDIA control panel > Manage 3D settings > Global Settings > Power Management Mode > Select "Adaptive"

If that doesn't have help, then try DXVA2 native instead of copyback.

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Re: Hardware Decoding with Skylake

Post by bamboozlr on Sat Feb 11, 2017 8:09 pm

Thank you! I think changing the power management might have helped.

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Re: Hardware Decoding with Skylake

Post by Admin on Sat Feb 11, 2017 9:47 pm

Great!

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