gstreamer alpha / chroma keying, v4l2loopback virtual webcam best practice?

[Daniel Pocock]

Hi all,

I was looking around for examples of how to chroma key a live stream
from a webcam and make it available as a virtual webcam for other
applications.

None of the examples were quite what I was looking for, so I decided to
make a new one and share it

https://gitlab.com/freertc/gstreamer-chroma-key

If anybody has any suggestions to improve it that would be very welcome.

While doing this, I also found that both Firefox and Chrome have
different issues with v4l2loopback virtual webcams right now:

Firefox, it doesn't work in Zoom or Jitsi Meet but it does work for some
other sites based on JsSIP / JSCommunicator:
https://bugzilla.mozilla.org/show_bug.cgi?id=1622628#c4

Chromium / Chrome, not working at all right now, needs a tweak in
Chromium or in the way the module works:
https://bugs.chromium.org/p/chromium/issues/detail?id=757399

Multiple bug reports for the same issues have also been opened in the
v4l2loopback issue tracker, e.g.
https://github.com/umlaeute/v4l2loopback/issues/78
https://github.com/umlaeute/v4l2loopback/issues/40
https://github.com/umlaeute/v4l2loopback/issues/183

but it appears that there have been different reasons why it failed at
different points in the history of the module and the kernel.

Regards,

Daniel