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I recently got a new 4K monitor and now whenever I play a video on this monitor, VLC only displays the video in the upper left quarter of the screen, when it's running in a window or full screen. When running in a window, the video display is actually somewhat falls slightly outside (to the left) of the main VLC window.

The resolution of the video makes no difference.

I tried a different player, Media Player Classic Home Cinema, and it plays it perfectly, but I would rather figure out how to get VLC to work.

I am running Windows 10 with a GTX 1060 video card.

I have completely no idea where to even start looking to troubleshoot this, I've done a fair amount of googling but haven't found anyone else with this problem.

  • Does your setup have dual-monitors? VLC will use the resolution of the main screen. – harrymc Apr 5 '19 at 19:28
  • It does, and the main screen is 4K. Regardless, wouldn't it adjust as you switch screens? – tbone Apr 5 '19 at 19:31
  • No, this is a problem with VLC. – harrymc Apr 5 '19 at 19:36
  • But, VLC is opening on the main (4K) screen, yet displaying in 1080....??? Surely it's capable of playing 4K content? – tbone Apr 6 '19 at 0:40
  • Who would downvote a question about a legitimate technical issue? – tbone Apr 6 '19 at 20:06
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On VLC Shortcut:

Right click, Properties, Compatibility, Change High DPI Settings

High DPI Scaling Override Override high DPI scaling behavior: Checked Scaling performed by: select Application

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I believe that this is a known problem with VLC on a computer with dual monitors. For best results the two monitors should have the same resolution.

As VLC is a Qt application, you might try to create an environment variable called QT_AUTO_SCREEN_SCALE_FACTOR with the value of 0

You might also raise the question on the The VideoLAN Forums, where you might get an answer from the developer.

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