madVR stuttering 4K playback

krzaku · 12th November 2018, 21:57

Hi. I'm having troubles playing my 4K remux files. Specifically they seem to stutter a lot when used with madVR + MPC-HC. This issue only occurs in high bitrate (remux, 70+ mbit/s) 4K files. Haven't tested regular 4K videos, but remux 1080p files (20-30 mbit/s) work fine. madVR struggles greatly, while VLC has no issues with those exact same files. Computer specs: VM machine, i7-4790k of which 6 cores are passed to the VM, GTX 1070 passed through to the VM.

The screenshot attached shows DXVA is used, but this also happens in fullscreen, where only bilinear chroma-upscaling is done. Encoder is set to hardware DXVA2.

huhn · 12th November 2018, 23:55

can you upload the screen somewhere else?

krzaku · 13th November 2018, 16:17

Here it is: https://i.imgur.com/zt3f9pv.jpg

Warner306 · 13th November 2018, 17:28

The decoder queue is empty. The video isn't being decoded correctly. Try another form of hardware decoding, like D3D11 Automatic (Native).

mytbyte · 13th November 2018, 20:46

Quote:

Originally Posted by krzaku

Hi. I'm having troubles playing my 4K remux files. Specifically they seem to stutter a lot when used with madVR + MPC-HC. This issue only occurs in high bitrate (remux, 70+ mbit/s) 4K files. Haven't tested regular 4K videos, but remux 1080p files (20-30 mbit/s) work fine. madVR struggles greatly, while VLC has no issues with those exact same files. Computer specs: VM machine, i7-4790k of which 6 cores are passed to the VM, GTX 1070 passed through to the VM.

The screenshot attached shows DXVA is used, but this also happens in fullscreen, where only bilinear chroma-upscaling is done. Encoder is set to hardware DXVA2.

No, sir, your OSD shows DXVA decoding is NOT in effect (it should also read DXVA2 or DXVA11 next to p10, 10 bit, 4:2:0). Check your gfx card is listed under Active Hardware Accelerator in LAV filters ..are UHD (4K) and HEVC checked?

krzaku · 15th November 2018, 22:58

Switching to D3D11 decoding worked, thanks! Any idea why it is like this? I'm sure I set DXVA2 in LAV Decoder settings, here's a screenshot: https://i.imgur.com/y6pP3ZX.png

Anyway, I still can't seem to get HDR to work properly. I set screen resolution to 4k@30hz, color settings to YCbCr422, color depth to 12 bit. Set madVR to passthrough HDR to the display. When playing a video the display switches to HDR mode, but the colors are desaturated. Here's a ctrl+j screenshot when in HDR mode: https://i.imgur.com/COxtfiW.png

Another issue is the audio seems to go out of sync over a longer period of time, any idea what this may be about?

huhn · 15th November 2018, 23:39

how much PCIe lanes do you get in this setup?

krzaku · 16th November 2018, 00:10

Full 16 lanes.

nevcairiel · 16th November 2018, 00:22

Quote:

Originally Posted by krzaku

Switching to D3D11 decoding worked, thanks! Any idea why it is like this? I'm sure I set DXVA2 in LAV Decoder settings, here's a screenshot: https://i.imgur.com/y6pP3ZX.png

DXVA2-CopyBack has a certain overhead in memory bandwith, add to that through a VM and it can quite possibly bottleneck decoding. D3D11 Native or DXVA2 Native are far more efficient.

krzaku · 18th November 2018, 16:18

Huh, I could've sworn I tried DXVA2 Native before, but I guess I didn't because selecting that now also fixes the issue I was having in the OP.

Any idea about the 2 issues I described a few posts above?

12th November 2018, 21:57	#1 \| Link
krzaku Registered User Join Date: Nov 2018 Posts: 5	madVR stuttering 4K playback Hi. I'm having troubles playing my 4K remux files. Specifically they seem to stutter a lot when used with madVR + MPC-HC. This issue only occurs in high bitrate (remux, 70+ mbit/s) 4K files. Haven't tested regular 4K videos, but remux 1080p files (20-30 mbit/s) work fine. madVR struggles greatly, while VLC has no issues with those exact same files. Computer specs: VM machine, i7-4790k of which 6 cores are passed to the VM, GTX 1070 passed through to the VM. The screenshot attached shows DXVA is used, but this also happens in fullscreen, where only bilinear chroma-upscaling is done. Encoder is set to hardware DXVA2. Attached Images

13th November 2018, 17:28	#4 \| Link
Warner306 Registered User Join Date: Dec 2014 Posts: 1,127	The decoder queue is empty. The video isn't being decoded correctly. Try another form of hardware decoding, like D3D11 Automatic (Native). __________________ HOW TO - Set up madVR for Kodi DSPlayer & External Media Players

12th November 2018, 23:55	#2 \| Link
huhn Registered User Join Date: Oct 2012 Posts: 7,926	can you upload the screen somewhere else?

13th November 2018, 16:17	#3 \| Link
krzaku Registered User Join Date: Nov 2018 Posts: 5	Here it is: https://i.imgur.com/zt3f9pv.jpg

15th November 2018, 22:58	#6 \| Link
krzaku Registered User Join Date: Nov 2018 Posts: 5	Switching to D3D11 decoding worked, thanks! Any idea why it is like this? I'm sure I set DXVA2 in LAV Decoder settings, here's a screenshot: https://i.imgur.com/y6pP3ZX.png Anyway, I still can't seem to get HDR to work properly. I set screen resolution to 4k@30hz, color settings to YCbCr422, color depth to 12 bit. Set madVR to passthrough HDR to the display. When playing a video the display switches to HDR mode, but the colors are desaturated. Here's a ctrl+j screenshot when in HDR mode: https://i.imgur.com/COxtfiW.png Another issue is the audio seems to go out of sync over a longer period of time, any idea what this may be about?

15th November 2018, 23:39	#7 \| Link
huhn Registered User Join Date: Oct 2012 Posts: 7,926	how much PCIe lanes do you get in this setup?

16th November 2018, 00:10	#8 \| Link
krzaku Registered User Join Date: Nov 2018 Posts: 5	Full 16 lanes.

18th November 2018, 16:18	#10 \| Link
krzaku Registered User Join Date: Nov 2018 Posts: 5	Huh, I could've sworn I tried DXVA2 Native before, but I guess I didn't because selecting that now also fixes the issue I was having in the OP. Any idea about the 2 issues I described a few posts above?