Youtube – 4k 60fps – Deleting images (stutter / lag / freeze)

I try to see 2160p (4k 60fps) content on Youtube, but I experience a lot of frisky frames … d. H. The video freezes / stutters completely (the sound is fine).

The youtube example I use: Costa Rica – 4k 60fps – Youtube

If I look at the video in 1440p, it will play smoothly without dropped pictures. When switching to 2160p, however, the video is stopped / stuttered due to the large number of dropped frames (80%) (see below).

Exuberant pictures - 28 sec. - Youtube 4k 60fps

Therefore my internet (via cable) is stable and ok and I use the VP9 codec in combination with HTML5 and Mozilla Firefox / Microsoft Edge (same result). I do not use hardware acceleration.

My PC specifications:

  • MSI H97M-G43
  • Intel Core i5-4460 Boxed
  • MSI GeForce GTX 1080 GAMING X 8G
  • Crucial Ballistix Tactical BLT2C4G3D1608ET3LX0CEU
  • Seasonic M12II Evo 620W
  • LG 27UK850-W silver
  • Windows 10 Education (is Pro version) – Version 1803 – Build 17134.590
  • Nvidia driver – (NVIDIA 417.71)

So in my opinion it should be enough to watch 2160p videos on Youtube. The CPU is a bit stressed, but the load is 80%. The GPU barely runs because 2160p content requires a lot of decoding from the CPU.

Electricity (after 28 seconds) – Min – Max:
CPU - 28 sec. - Youtube 4k 60fps

Does anyone have any idea what is wrong / how to fix it (software setting or is it really the CPU)? Thanks for all the information!

Display – Does the Macbook 12 Inch (2016) support the output of 4K 60 Hz to an external monitor?

I have an ASUS PB287Q monitor. I connect my Macbook 12 Inch (2016) to Mattis via a Mini DisplayPort cable and a Belinda USB TypeC Mini DisplayPort / Mini DP adapter to the monitor.

In this configuration, I think a refresh rate of 60 Hz with a resolution of 3840 at 2160 can be obtained.

System Report - Display

I have also done the UFOTest and it seems that my refresh rate is 60 Hz from the result on this website.

UFOTest result

However, according to the official specification from the Apple website, the Macbook 12 Inch (2016) should not offer a resolution of 60Hz at a resolution of 3840 with 2160. It should be at max 30Hz.

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So is it a true 60Hz refresh rate, which I get in a resolution of 4K (3840 x 2160), or do I get wrong information about the refresh rate from two different sources?

Am I missing something?

Can the Xiaomi Mi Box 4K stream videos from an external server using SMB or FTP protocol with external subtitles?

I'm seriously considering moving from my Android TV-based Flix TVBox player to the Xiaomi Mi Box 4K, as my current solution for playing / streaming video from an external server via the SMB or FTP protocol with external subtitles is not completely works.

Some software players (i.e., VLC) can browse network shares (others do not), but all fail when opening external subtitles, ie. H. They are stored in the .srt or .txt file with exactly the same file name as the corresponding video file. Subtitle viewing is only possible if embedded in video files that support embedded subtitles (such as MKV) or subtitles downloaded from

This is especially weird as it only happens with the SMB / FTP protocol. If you use exactly the same player on the local hard drive, everything works like a charm.

I would like to ask how it works with the Xiaomi Mi Box 4K?

Record 4K time-lapse with Canon EOS 5D Mark IV

This is a limitation on how the EOS 5D Mark IV records 4K video.

When capturing 1080p video, the camera uses the entire sensor surface and reduces the resolution of the 6720 x 4480 pixel sensor by binning to 1920 x 1080 pixels per image.

When recording 4K video, the camera uses only 4096 x 2160 pixels in the center of the sensor, increasing the field of view by a factor of 1.7.

To use the full range of the Time Lapse sensor, you must use 1080p in video mode or full camera resolution in still mode.

You can reduce the wear on your shutter curtains and mirrors by using the Live View LV mode in live image mode with Live View. In both modes, the mirror stays on top (assuming you did not enable the "Quick" PDAF focus option). in the Mute 1 Only the first curtain moves to stop and then reopen the exposure. in the Mute 2 Only the 2nd curtain moves throughout the sequence. Alternately what Silent shooting Mode you use in Live View for each time-lapse session, halve the number of curtain moves on each of your shutter curtains, and reduce mirror movement once per session.

For more information on how the various Canon modes for still recording work with the similar EOS 5D Mark III, see What is the difference between Canon's silent and non-silent shooting?

4k Resolution – How can I connect an HDMI output from Apple TV to a USB-C INPUT monitor with speakers?

Unfortunately, I have already tried to connect an HDMI to USB C cable. But it did not work. After much research, I now understand that these adapter cables are only EINWEG. That is, they only work with an HDMI input connected to a USB-C output. My problem is that I bought a monitor with speakers that has only USB-C input connectors and NO HDMI INPUTS. Since the seller will no longer accept a return because I was not at a wedding, I did not have time to try it out; I'm stuck with this monitor now. Is there a way to connect an Apple TV 4K HDMI OUTPUT to a USB-C INPUT of a monitor with speakers?

mac mini – 4K HDMI output from MacMini (late 2018) to LG C8 (OLED55C8PLA)

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Mavericks – Intel HD Graphics 5000 has to spend 4K

I have a MacBook Air connected to a 4K monitor with Mojave in late 2013:

                Intel HD Graphics 5000:

Chipset model: Intel HD Graphics 5000
Type: GPU
Bus: built-in
VRAM (dynamic, max.): 1536 MB
Seller: Intel
Device ID: 0x0a26
Version ID: 0x0009
Metal: Supported feature set macOS GPUFamily1 v4
LG Ultra HD:
Resolution: 2560 x 1440 (QHD / WQHD - Wide Quad High Definition)
The user interface looks like this: 2560 x 1440 @ 59 Hz
Frame Buffer Depth: 24-bit Color (ARGB8888)
Main display: Yes
Mirror: Off
Online: Yes
Rotation: Supported
Automatically adjust the brightness: no
Connection Type: DisplayPort

I have read several times that this chipset can output 4K, but macOS prevents this.

Is it possible to force Mac OS X to output 4K?