Comments (4)
robmikh
commented on May 17, 2024
1
Generally the DWM is triple or double buffered, this isn't unique to presenting captured content. There is no way to disable the DWM as of Windows 8. And if you did, the capture API would not be able to return frames to you, as they are rendered by the DWM 🙂.
from windows.ui.composition-win32-samples.
nergnezor
commented on May 17, 2024
Thank you for the quick response! And the DWM only updates the buffers once every monitor refresh i assume? Do you know if I can speed up the buffer copying then? 66 ms (2 x 1000/30 Hz) is a long time to wait if you're in a hurry 🙂
from windows.ui.composition-win32-samples.
robmikh
commented on May 17, 2024
That's correct, we're locked to the vsync (normally, there are some edge cases given your monitor topology and if you're running a full-screen game). I'm guessing by making a copy of the buffer you're talking about calling CopyResource or CopySubresourceRegion? How are you measuring this?
from windows.ui.composition-win32-samples.
nergnezor
commented on May 17, 2024
No, I meant forcing the DWM buffers without waiting for vsync.
I'm measuring by recording the screen area of the source and target and then stepping through the recording frame by frame where there are changes
from windows.ui.composition-win32-samples.
Related Issues (20)
- Some samples use `WindowsRuntimeMarshal` class, that is no longer available in .NET 5+ HOT 4
- Cannot use IGraphicsCaptureItemInterop::CreateForWindow with electron apps HOT 6
- This repo is missing important files HOT 4
- How to capture Windows10/11 Virtual Desktop via Windows.Graphics.Capture ? HOT 2
- Accessing screen capture image bytes with MapFlags.DoNotWait for better CPU usage HOT 3
- Can I do successive captures on two different windows HOT 8
- ScreenCapture Sample - write capture stream to disk mp4? HOT 5
- Capture area of a monitor HOT 4
- Memory Leak? HOT 5
- BSODs on 4 separate Hard Drives HOT 3
- Multiple screen captures in a loop cause explorer.exe and native Windows app to lag? HOT 11
- Capture OnFrame Callback very slow on Win11 23H2 HOT 7
- access_denied in CreateForMonitor in some cases HOT 5
- Cannot catch errors in CreateCaptureItemForWindow HOT 3
- WGC CaptureFrame returns wrong SystemRelativeTime in window capture mode HOT 2
- Cursor may become invisible when recording some fullscreen games using WGC HOT 6
- Frame has issue after change window state (maximize from normal/ normal from maximize/ ...) HOT 1
- ScreenCaptureforHWND sample leaks handles leading to "Out of memory" crash HOT 1
- ScreenCaptureforHWND sample main thread hang HOT 2
- ScreenCaptureforHWND: How to get the byte data of the captured frame? HOT 4
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