[BUG]High CPU Usage When Frame Rate Exceeding Monitor Refresh Rate

[douziovo]

When playing videos using MPC-BE and MPC Video Renderer, there is a noticeable increase in CPU usage if the video’s frame rate surpasses the monitor’s refresh rate. This issue does not occur with Enhanced Video Renderer (EVR).

Software version MPC-BE 1.7.0 MPC Video Renderer 0.7.3.2210

[Aleksoid1978]

Sample file. Show you MPC VR settings.

[douziovo]

This is my MPC VR settings.

This is a sample file https://drive.google.com/file/d/1lgTamQ9FuimEwEOFR8eveBpR9oonzd8a/view?usp=sharing

You can test on a monitor below 120Hz.

[Aleksoid1978]

Show CPU usage on EVR CP and MPC VR, also show on "normal" file with 23.976 fps.

[Aleksoid1978]

And it is not at all correct to compare with a regular EVR, it is much simpler. Although my workload is approximately the same.

If this bothers you, use EVR.

[v0lt]

What version of Windows do you have? What video card do you have? Is hardware acceleration used for video decoding?

You can also take a screenshot with video renderer statistics. This clears up a lot of questions.

[douziovo]

This is my computer setup.

CPU 12th Gen Intel(R) Core(TM) i5-12400 2.50 GHz GPU NVIDIA GeForce RTX 2060 SUPER GPU Driver Version31.0.15.5212 Monitor LG27GP83B@59.951Hz Edition Windows 10 Pro Version 22H2 OS build 19045.4170 Experience Windows Feature Experience Pack 1000.19054.1000.0

I decoded the video using hardware acceleration and reset the settings for MPC-BE, EVR and MPC VR. I've also included some screenshots hoping it helps resolve the issue.

MPC VR

120FPS

23.976FPS

23.976FPS 4X

EVR

120FPS

23.976FPS

23.976FPS 4X

[clsid2]

When is decided when a frame is dropped? Before processing, after processing, or both before and after?

Because when input framerate is much higher than output, you already know before processing.

[Aleksoid1978]

Different decoder - dxva vs d3d11. Compare in MPC VR in Direct3D9 mode.

[douziovo]

DXAVA2 + D3D11 VR

This looks like software decoding

DXVA2 + D3D9 VR

D3D11 + D3D9 VR

[Aleksoid1978]

As I understand, in the DXVA2 + D3D9 VR mode the load is normal, which means the video drivers are entirely to blame, I have a 4060 and there is no such problem.