Use Your Mobile Camera as Webcam on Fedora With V4l2 Loopback

Usually, the quality of built in webcams on laptop computers is not very good. It can introduce a lot of noise in the picture, which is not always good for live streaming, video recording or even for video conferencing for that matter. External good quality webcams solve this problem; but they are expensive. If you have an android device with a good camera, you can use that as a webcam on your computer, which will give you a very good quality (high resolution) video feed. Did I mention that you can do this without using any proprietary software on any of the device? So let’s see how to do that.

For this you will need follwing tools.

In this process we are going to

So let’s get started.

You will also need following things setup on your system.

Note: Make sure you have GOROOT and GOPATH set properly we need that for building gortmp.

First off, let’s clone the tools.


To clone it,

$ git clone

Once that is done, open it in the android studio let gradle finish it’s processing.

After that, change URL for the RTMP stream in app/src/main/java/io/antmedia/android/ at line number 16 to whatever your URL is. (according to this post it should be rtmp://<your deice ip>:1935/rtmp/.)

Now build this project and install it in your device.


The LiveVideoBroadcaster is an application from antmedia, They also provide an RTMP server, (which I did not use because I’m lazy and already had gortmp on my system and that worked well ;) ).

So let’s clone and build gortmp

$ go get

To build and use it

$ cd $GOPATH/src/github/sevenzoe/gortmp
$ go build
$ mkdir /tmp/rtmp
$ ./main.go

This will start the rtmp server on this machine.

Now we that have both our RTMP server and android application (LiveVideoBroadcaster) running, let’s test the setup once.

You get ffplay tool with your ffmpeg installation, this can be used to play this live stream from the mobile.

Start the mobile application, click on LiveVideoBroadcaster button and enter the stream name what ever you like. (for example stream1).

on gortmp console you will see logs for newly accepted connection.

Now to test it.

$ ffplay rtmp://localhost/rtmp/<your stream name>
# for example
$ ffplay rtmp://localhost/rtmp/stream1

This will render the live stream from your mobile on to your computer screen.

Once we have this thing setup we have to create a virtual camera on the computer and pass this incoming video feed from the mobile to it.

In order to do that we need to use v4l2-loopback. Let’s clone and install that.

But before doing that, let’s first see how many cameras are available on the system.

$ ls /dev/ | grep "video"

here you will see the list of available cameras on the system.


To clone it.

$ git clone

To build it

$ cd v4l2loopback
$ make
$ sudo make install
$ sudo depmod -a

If you don’t see any warnings after sudo depmod -a command, that means you it setup properly.

Now let’s create the virtual camera.

$ sudo modprobe v4l2loopback

After inserting the v4l2loopback module, we should see one more camera on the system. let’s check it again.

$ ls /dev/ | grep "video"

Let’s try this new camera on the system. Let’s say the new virtual camera is the device /dev/video3 on your system. Then the command will be

$ ffplay /dev/video3

You will probably see no output or a blank screen. Remember we had to pass the data from the rtmp stream to this camera? Let’s do that.

For this purpose we will use ffmpeg. The command will be

$ ffmpeg -re -i rtmp://localhost/live/rtmpv1 -an  -f v4l2 -vcodec rawvideo -pix_fmt rgb24 /dev/video3

Let’s see what this command does.

If this works, let’s run ffplay to test the camera once again.

$ ffplay /dev/video3

At this point you should see the video feed from your mobile camera on the system’s virtual camera. You can use it for the video conferencing, Video recording and all sorts of things you use your web cam for.