Implement window capture

[adryzz]

On x11grab the window_id input option is available, while on gdigrab the window title can be provided, but i need to look further into using a HWND instead of a title

[adryzz]

Was able to get it to work for x11grab, using the windows_id input option

[Redth]

Any idea what the equivalent should be in theory on macos? Happy to try and help test it out if you can point me in the right direction.

[Speykious]

Any idea what the equivalent should be in theory on macos? Happy to try and help test it out if you can point me in the right direction.

And we would be very happy to have a Mac user help us here! None of us have Macs, so we can only rely on FFmpeg's support for Mac input formats and haven't really been able to test anything Mac-related. :(

So the first place we can look at for this is FFmpeg's documentation on input formats. The ones that MacOS uses to my knowledge are AVFoundation and QTKit (which I think is no longer available).

In https://ffmpeg.org/ffmpeg-all.html#avfoundation, I didn't really see any option for capturing a window... I hope we don't have to use another native solution for this...