![]() ![]() In the third tab gst-launch-1.0 v4l2src device=/dev/video1 ! videoconvert ! ximagesink In the second tab gst-launch-1.0 v4l2src device=/dev/video1 ! videoconvert ! ximagesink In the second tab gst-launch-1.0 v4l2src device=/dev/video2 ! videoconvert ! ximagesinkĮven if I use the same /dev/video1 device multiple times it all gives me that many stream. In the first tab gst-launch-1.0 v4l2src device=/dev/video1 ! videoconvert ! ximagesink Now I run the following in one terminal window gst-launch-1.0 v4l2src device=/dev/video0 ! tee name=t ! queue ! v4l2sink device=/dev/video1 t. There should now be /dev/video1 and /dev/video2 created assuming /dev/video0 was the only video device. Based on $ modprobe v4l2loopback devices=2 I just have 1 webcam on my laptop /dev/video0 and I wanted to get 2 streams from the same hardware. I got warning message as here on Ubuntu 18.04 LTS (but it didn't prevent me from loading v4l2loopback driver) $ sudo depmod -a I first installed gstreamer packages on Ubuntu 18.04 Here is a relatively complex but very practical example: Structure This means, for example, it is possible to use a complicatedly mixed video by OBS as a camera input to a Web meeting (e.g. You can send any (raw) video to a virtual video device. I wrote a script to wrap these steps: v4l2_webcam - GitHub. Thus, in this case, you don't have to create many virtual devices. Note, unlike a physical webcam, a single virtual video device can be accessed from multiple applications simultaneously. Now /dev/video5 works as a pseudo-webcam. $ ffmpeg -i /dev/video0 -f v4l2 -codec:v rawvideo -pix_fmt yuv420p /dev/video5 To make them useful, you have to send streams to them via external applications such as ffmpeg.įirst load the module $ sudo modprobe v4l2loopback exclusive_caps=1 video_nr=5 #creates `/dev/video5`Īnd then send your webcam's input to the virtual device. ![]() While v4l2loopback creates virtual video devices, they are not associated with anything by default. Since there is no answer using ffmpeg, this is it. ![]()
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