What is the benefit? Why is this valuable?
Screen capturing of individual windows has been requested on top of video playback and recording which already works.

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What are common use cases?
Screen sharing of windows
Taking pictures of individual windows

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Technical information

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This issue explores the feasibility and requirements for adding screen/window capturing to QtMultimedia. On the input side, a user should be able to select a desktop screen or a window and the frame rate for capturing. Thus, on each platform we need to:

• get a list of opened windows and desktops
• read a window/desktop content

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The capturing object should work with QMediaCatpureSession, so we can display the capture content in a window or record it to a file. 

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