Redirect real webcam to a virtual webcam via terminal
Based on this answer (already mentioned in the question) I think I have found a solution by myself, and it works with Skype!
Suppose the real webcam is in /dev/video0
. When you run
modprobe v4l2loopback
the module creates a second (virtual) webcam, for example in /dev/video1
. At this point, it is sufficient to execute:
ffmpeg -i /dev/video0 -vcodec rawvideo -pix_fmt yuv420p -threads 0 -f v4l2 /dev/video1
and the new virtual webcam is ready to be used and selected with Skype as well.
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Kubuntuer82
Updated on September 18, 2022Comments
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Kubuntuer82 over 1 year
Is there a way to redirect a real webcam to a virtual webcam from the command line, for example using the
v4l2loopback
module withffmpeg
?Details
I have an old webcam which works with most software (vlc, cheese, etc.), but not with others (Skype).
A possible workaround to make it work with such software is to redirect it to a virtual webcam using the
v4l2loopback
module, as done by Webcamoid, but I need to do it from the command line, for example viaffmpeg
.I am sure this is possible via
ffmpeg
as well, but since real webcams are rarely redirected to virtual ones, I found no examples online (the only examples I have found, like this one, redirect screen captures or existing videos to the virtual webcam instead).-
llogan almost 6 years
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Kubuntuer82 almost 6 years@LordNeckbeard The answers have something in common, but the questions are very different. That OP is asking to send a pre-recorded video (
input.mp4
) to an existing physical device, and the answerer suggests to use v4l2loopback instead. Here we are talking about sending a live real webcam to a virtual webcam, since this may make the webcam indirectly more compatible with some apps (e.g. Skype), which would not recognize it otherwise. In fact, the answer to that question suggests to use something likeffmpeg -i input.mp4
which is not what I was looking for here. -
Kubuntuer82 almost 6 years@LordNeckbeard and that answer also shows how to grab the desktop, which not only was not what I was looking for here, but it is also very similar to this post which I already mentioned in my question. I was looking for something different, i.e. redirecting another webcam instead of the desktop or a file (as I also say in the question). I appreciate that the solutions are based on the same software, but since the questions are very different I think it is still good to share this for people who struggle with this particular problem.
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