Need help with 4k movies

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Need help with 4k movies

Post by agresive on Sat Jan 07, 2017 2:42 pm

Hello, firs of all sorry for my English it's a little bit rusty.

So I use mpc player and i have this issue with 4k movie : 2160p 4K UltraHD BluRay (x265 HEVC 10bit) 2ch AC3.
The sound is delaying and the movie as well. Some times it stops and the sound goes on. I have tried to change settings but it did'int helped so far. And i looked in the internet for info but everything i'm trying to do is useless. And I want The BEST sound and VIDEO QUALITY. Can someone help me, please?

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Re: Need help with 4k movies

Post by Admin on Sun Jan 08, 2017 4:02 pm

Your computer is not fast enough to play such files. Even the most powerful CPUs can't handle it. You need a graphics card that supports hardware accelerated decoding of 10bit HEVC.

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Re: Need help with 4k movies

Post by agresive on Sun Jan 08, 2017 4:35 pm

My computer is fast enough ;D I have MSI with gtx 960m that supports 4k. i was able to do that it would work perfectly, but then my friend reset everything and I don't remember how to do that it would work again.

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Re: Need help with 4k movies

Post by Admin on Mon Jan 09, 2017 2:33 am

That card supports HEVC 10bit.

In LAV Video decoder settings select "DXVA2 Copy-back" in the hardware acceleration section.

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Re: Need help with 4k movies

Post by nikkoaki on Mon Jan 09, 2017 2:55 am

Admin wrote:That card supports HEVC 10bit.

In LAV Video decoder settings select "DXVA2 Copy-back" in the hardware acceleration section.

Actually no, the mobile version of the 960 does not.
EDIT: Source: forum.cyberlink dot com/forum/posts/list/44178.page

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Re: Need help with 4k movies

Post by Admin on Mon Jan 09, 2017 3:11 am

You are correct. I read to fast and thought it was a regular 960. The mobile version does not support HEVC acceleration.

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Re: Need help with 4k movies

Post by agresive on Mon Jan 09, 2017 6:33 pm


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Re: Need help with 4k movies

Post by nikkoaki on Mon Jan 09, 2017 7:05 pm


Supporting 4K doesn't mean supporting 4K HEVC.
The 960m is based on the GM107 and not on the GM204/GM206 like the desktop variants. Only the 965m and up are based on these.
Also, most of the information out there is wrong. You read everywhere that all maxwell cards have this, all pascal cards have that, etc etc.. but they don't tell you it doesn't apply to ALL cards. For ex, nvidia stated that ALL maxwell cards support NVENC.. my laptop has a 840m which is a maxwell card and NVENC isn't supported at all.

And like you, i can also tick all the check boxes in the LAV menu but that doesn't mean it will work.

Have you tried other options like VLC or even something commercial like PowerDVD (maybe it has a better CUVID implementation but i doubt it)?

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Re: Need help with 4k movies

Post by Admin on Mon Jan 09, 2017 11:40 pm

The 4k ability of that GPU is only for the maximum resolution that it can output to a connected monitor/tv. It is unrelated to its (in)ability to decode video in 4k resolution.

The checkboxes in LAV Video settings are always "available", even on ancient computers. Enabling them only has effect when the hardware actually supports those formats. In all other cases it will fall back to using normal software decoding.

Your GPU should be able to decode H.264 video in 4k, but not newer formats such as HEVC and VP9.

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Re: Need help with 4k movies

Post by agresive on Tue Jan 10, 2017 5:25 pm

thanks foe explanation and help!!! Wink

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Re: Need help with 4k movies

Post by chjc on Wed Jan 11, 2017 3:34 am

I own an XPS 15 with a quad core and 960m. Using software decoding, I am able to play an HEVC 4K 21:9 movie sample (~50Mbps) with DTS audio smoothly even with handbrake running in the background (~40% CPU usage). However, if exceeding that bitrate, even MPC-HC running by itself still lags, such as my other 4K video sample (16:9 @~90Mbps), with my CPU at 100% usage.

I recommend reencoding the files to AVC, as the same 16:9 sample in AVC (4K@~100Mbps) only uses 10-20% CPU and playbacks smoothly.

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Re: Need help with 4k movies

Post by nikkoaki on Wed Jan 11, 2017 12:23 pm

chjc wrote:I own an XPS 15 with a quad core and 960m. Using software decoding, I am able to play an HEVC 4K 21:9 movie sample (~50Mbps) with DTS audio smoothly even with handbrake running in the background (~40% CPU usage). However, if exceeding that bitrate, even MPC-HC running by itself still lags, such as my other 4K video sample (16:9 @~90Mbps), with my CPU at 100% usage.

I recommend reencoding the files to AVC, as the same 16:9 sample in AVC (4K@~100Mbps) only uses 10-20% CPU and playbacks smoothly.

Shouldn't handbrake be taking all of your cores to 100% just by itself? Razz
Is your sample really 10-bit? I'm not saying it shouldn't play it, but usually even desktop class i7's need more than 40% cpu util to decode it (depending on the architecture and clock-rate, of course).

Also, reencoding is very time consuming. Isn't it better to just search the web for an AVC version done by someone else? I'm not even talking about piracy, if i have the original blu-ray i just prefer to get a file already encoded by someone else than doing it myself.

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Re: Need help with 4k movies

Post by chjc on Thu Jan 12, 2017 2:42 am

I'm just pointing out how a simple move from 21:9 to 16:9 (35% increase in resolution) and an increase in bitrate could go from playable under load to murdering my hardware.

I was suggesting a reencode under the assumption no piracy was done and the rip was done manually. But yes, encoding 4K AVC can take time, but can be achieved with decent hardware over night with a medium preset. Most blurays are still done is AVC though so a simple file extraction and remux could work.

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