使用/作为网络摄像头视频捕获和记录桌面屏幕

Question

Webcam lets others view either still pictures or motion video of a user or other object in front of it. I want to configure Webcam in a way that it start capturing desktop screen instead of what is in front of it.

I want to manipulate desktop screen captured through Webcam using FFMPEG library. Such as:

ffmpeg -f dshow -i video="Integrated Webcam" -f mp4 cam_stream.mp4

I want to use this same application to capture my Desktop Screen that will be possible just in that case when Webcam will be able to capture my Desktop Screen instead. So above command will start recording what Webcam will be capturing that I want it to capture my desktop screen.

Note: I know other ways to capture, record or stream desktop screen but I want to achieve it through Webcam.

What I tried so far: I tried some Fake/Virtual Webcam software (manycam, sparkocam etc.) but I don't think they fulfil what I exactly want.

PS I posted the same question in another community but didn't get any response.

Please guide me if there is any way to achieve this? Thanks

Answer 1

Solution to this problem would be to capture desktop directly by using ffmpeg. Follow the link Capture Desktop using ffmpeg

Answer 2

Ive been searching all day for a similar thing. Ive found this: https://streamshark.io/blog/using-obs-as-a-virtual-webcam-on-windows-and-macos/ With this software you can create a virtual cam that can utilize a portion of your screen as a fake webcam output. Exactly what I need and what I think the OP is talking about. So for future ref, bumped.

(Why do I need this for instance?: I dont have a smartphone, but a virtualbox android. I want to install the windows desktop app versions of certain apps. For which I need to "hold the phone (virtualbox) in front of a computer screen (main os)"...

Answer 3

On this forum see this post on capturing the desktop: Capture Windows screen with ffmpeg

If I understand well, you also want to add views from your webcam. The above mentioned link on capturing the desktop shows how to use dshow. So the desktop and the webcam are both input streams for your output mp4. I suggest to add your webcam as input:

-f dshow
-i <webcam>

Next, eg use the overlay filter to put both the desktop and the webcam on one view.