Media Player Classic stutters and interrupts when start Web browser or some Windows 11 dialog window.

Media Player Classic stutters and interrupts when start Web browser or some Windows 11 dialog window. It uses high CPU resources. This bug occurs only in Windows 11. On Windows 10 everything is fine.

Media Player Classic version is 1.9.15.79 (759de8ceb); Compiler MSVC v19.29.30133; Build date Sep 17 2021
LAV Filters:
LAV Splitter:0.75.1.4
LAV Video: 0.75.1.4
LAV Audio: 0.75.1.4
FFmpeg compiler: MinGW-w64 GCC 10.2.0
Operating system: Windows 11 64 bit 21H2 (OS Build 22000.194)

Any issues that happen only on Windows 11 are either a bug in Windows or in your current graphics driver.

Maybe you are right. I tried on 3 home PCs and the same bug. I doubt this is from the drivers. I have no problems with WIndows Media Player or Movies &TV. Maybe the problem is in the WIndows.

1) Is it the player itself that gets increased CPU usage? Or some other process in the system?
2) With a dialog window, do you mean for example just an Explorer window?
3) Does the CPU usage drop again immediately after closing that other window?
4) Does the CPU usage change if the player window is the active one (has focus) versus another window being the active one?
5) Which graphics cards do your three systems have?
6) Does the increased CPU also happen if nothing is playing in MPC-HC?

Hi I got similar issues
after updated to K-Lite Codec Pack 16.4.7 Update Wednesday, September 22nd 2021
every time open MPC it will mute all browser audio
- I closed MPC then in 3-5secs it will have audio in the browser

no other troubleshooting done as MPC only secondary tool of Youtube and NetFlix

Edition Windows 10 Pro
Version 20H2
Installed on ‎4/‎27/‎2021
OS build 19042.610
Experience Windows Feature Experience Pack 120.2212.31.0

Processor Intel(R) Xeon(R) CPU X5690 @ 3.47GHz 3.46 GHz
Installed RAM 48.0 GB
GPU RX 480 8GB driver AMD 21.8.2

CPU Process normal under 23% cause I running android emulator all the time and using mpc for music

That is a totally different issue.

Disable "exclusive mode" in the audio renderer settings. When that is enabled only one application has exclusive access to the audio output.

Or disable it completely:
Windows Sound Settings > select device > Properties > Advanced > disable exclusive mode options