added article about using phone as linux camera

static/articles/Use_phone_as_camera_for_linux_desktop/Use_phone_as_camera_for_linux_desktop.md

@@ -0,0 +1,31 @@
+First, we need to install an application, that'll provide MJPEG video stream. There is IP Webcam, but it is closed source, so it doesn't fit our requirements, through it could be a simplier solution. We will use [ScreenStream](https://github.com/dkrivoruchko/ScreenStream) instead, that is also [available](https://f-droid.org/packages/info.dvkr.screenstream) on F-Droid. With it we can share anything displayed on the phone screen, so, to stream video from camera, we can use any camera solution.
+
+Next, we need to connect phone with our linux PC. For it you can connect them to the same network. But to lower thresold, you can connect them with a wire, enable USB debugging and forward port with adb:
+
+```
+adb forward tcp:8000 tcp:8080
+```
+
+Prior command will set up PC' port 8000 to phone's 8080. Also note, then if you use ScreenStream, you need to enable local host in its settings.
+
+Next step is to set up a dummy interface for our camera. For it, install and enable v4l2loopback kernel module:
+
+```
+sudo pacman -S v4l2loopback-dkms
+```
+
+It will create a dummy video interface on `/dev/video0`. We'll assume, it is enough, but if you need more then one device, you can easely google, what params need to be passed while manually enabling the module.
+
+Then, if you don't have ffmpeg, install it:
+
+```
+sudo pacman -S ffmpeg
+```
+
+And finally:
+
+```
+sudo ffmpeg -i http://[localhost или ip адресс телефона]:8000/stream.mjpeg -fflags nobuffer -pix_fmt yuv420p -r 30 -f v4l2 /dev/video0
+```
+
+That's all, now you can use your phone camera (or, any other app) just like your PC camera.

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 1627839955679 Publite_-_an_Ebook_reader
 1646570601234 Mount_WSL_partition_on_Arch_Linux
+1653350638050 Use_phone_as_camera_for_linux_desktop