Windows 10: Strange video playback issues, no clue why

  1. Posts : 8
    Windows 10 Pro 64bit
       23 Mar 2016 #1

    Strange video playback issues, no clue why

    Hello guys, this is my first post here.

    I'm experiencing occasional stutter when watching 4K (even 720p/1080p @ 60 FPS) videos both on YouTube and files downloaded on my SSD, with MPC-HC. On YouTube (Chrome), I've been dropping frames on heavier videos. The likes of 4K/60P, but the ones that are 4K/24/30P seem to be perfect with 0 drops. The 60FPS (even 720p/1080p) ones are a different story.

    My CPU is Intel Core i7 6700K, and as far as I know, it supports smooth playback at 4K and 60 frames per second. My internet connection is also pretty good ~60-80mbps. I also want to note that I'm using the integrated graphics card on the CPU, as I do not have a dedicated one currently.

    I opened Task Manager 5 minutes ago, and I noticed that every time there's frame drops, my CPU usage spikes up. Please, take a look at this screenshot:

    Why does this happen? Isn't the CPU powerful enough to play 4K/60P buttery smooth? Why the spikes?

    A few quick notes - all system drivers updated, latest bios, no overclocks, everything's stock, no other tabs in Chrome, no other apps running, @ High Performance, CPU temps are perfect ( low 20s, even 18-19c when Idle - when watching those videos - no more than 50-60c). Tried other browsers - no change. Tried flash - worse.

    I just noticed that even on videos that are 720/1080 @ 60FPS it stills drops a lot of frames, even though CPU usage is like 10-15%... I even tried switching the codec - from VP9 to MP4/VC1 (through an YouTube extension), and it still drops frames. So it mustn't be the codec either. It doesn't matter if it's full screen or not. I guess there's ALSO a problem with the videos being 60 frames per second. I just ran a 4K@30P video for 40 minutes on repeat and there wasn't a single frame drop, so yeah.. what the hell. - A video example that drops frames in YouTube. It also stutters on the computer with MPC-HC.

    Can anyone clarify if the 6700K is/isn't powerful enough to play 4K60P perfectly (on its own)? Maybe I need a dedicated graphics card too, in order to play those video smoothly? Because if the iGPU is helping, which I assume it is, since Hardware Acceleration is enabled (and when I disabled it, clips got completely unwatchable).. this should mean that it's not strong enough to help out the CPU. Which leads to the conclusion (if that's true) that you definitely need a dedicated graphics card for stutter-free playback and no dropped frames, especially at 60P. Correct me if I'm wrong.

    I hope that I've been clear enough with my issue and I want to thank in advance anyone who might chime in!
    Last edited by iamnewhere; 24 Mar 2016 at 12:47.
      My ComputerSystem Spec

  2. Posts : 8
    Windows 10 Pro 64bit
    Thread Starter
       24 Mar 2016 #2

    Bump, anyone?
      My ComputerSystem Spec

  3.    24 Mar 2016 #3

    That CPU should play video with no issues. What brand/model is your motherboard?
      My ComputerSystem Spec

  4. Posts : 8
    Windows 10 Pro 64bit
    Thread Starter
       24 Mar 2016 #4

    @PJLLB ASRock Z170 Pro4
      My ComputerSystem Spec

  5.    25 Mar 2016 #5

    iamnewhere said: View Post
    @PJLLB ASRock Z170 Pro4
    I presume you're running the video driver from the vendor web site? If it were me I would uninstall the video driver and let Windows find the hardware and reinstall the driver. Something seems hosed. This motherboard and CPU are very capable and video should be better than that. FYI I have an Asus P8P67 LE with an Intel i5-2500K CPU (I know it's kind of old but it still works great) with a new NVidia GeForce 750 Ti running at full 3840x2160 60Hz into a Dell P2715Q 4K monitor and all video (streaming and local) is flawless. You should be getting great video with your hardware.
      My ComputerSystem Spec

  6. Posts : 8
    Windows 10 Pro 64bit
    Thread Starter
       26 Mar 2016 #6

    @PJLLB - I have done all that, and then some. I've tried all possible drivers. I know that they're capable, that's what's bothering me. I think it has something to do with tweaking the codecs, but I'm not sure.
      My ComputerSystem Spec


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