Hi,
I finally found the source of the problem on Windows 10.
Not in Lazarus, but in the level of a security program in Windows 10
that prevented access to the camera and microphone.
I rarely use Windows 10 (too much spywares
) , it's just a backup machine.
Here is a new version of the VideoGrabber DX9 with BGRABitmap.
On Windows 10, you have to change
Project Options->Application->UI Access to false
Project Options->Application->Execution Level to "as invoker"
Many thanks to the helpers
B->