How to capture a video of specified window in Mac OS

Question

I have tried to capture a screen video using this sample code How to capture screen activity to a movie file using AV Foundation

It's working fine but I am wondering how can I capture a specified window of some individual app (not screen area specified by CGRect).

I'm asking because Google Hangouts can share specified window even if it isn't visible.

So, my questions are:

How can I modify the code above to achieve this?
Is it possible to capture few windows at the same time?

You don't show any code, so what are you asking how to modify? — Mark Setchell, May 29 '17 at 21:44
Yes, it is. I said I want to modify it to capture a separate window, not full screen. — LembergSun, May 30 '17 at 00:08
Did you find out how to do it? Some screen recording apps offer this option but I cannot find any way to to it. — hotdogsoup.nl, Apr 14 '21 at 15:04
@LembergSun, I'm very curious to know if this has been solved. Do you have an update on it? — Sean256, Apr 29 '21 at 16:56
@Sean256 No, unfortunately I couldn't find any solution. And I'm not working on this anymore. — LembergSun, Apr 30 '21 at 19:23

score 0 · Answer 1 · answered Jun 14 '17 at 12:14

I'm not sure it is possible to capture video of background window using AVFoundation, unless you make your own concrete subclass of AVCaptureInput. But taking screenshot of background window can be implemented using CGWindowListCreateImage() function from Core Graphics framework. Apple's SonOfGrab sample code may be helpful.

How to capture a video of specified window in Mac OS

1 Answers1