I am experiencing a problem similar to what is decribed in this older
black video sent from ekiga on linux mint

In short, on my work computer I have two different versions of Ubuntu
installed, with roughly the same setup. I am connecting using H323 to a
specific endpoint and I am getting different behavior.

On my older Ubuntu 16.04 distro, everything looks good, I (and others) can
see the image from my webcam. On my newer Ubuntu 18.04 (Kubuntu actually),
the image from my webcam seems to be completely black and this is confirmed
by other participants, note that I can see their image fine. On this newer
distro, the problem disappears if I deactivate h264 (and h263) and revert
to h261 (although the image is at quite lower resolution. If I just test
the webcam using the preview  or try to see the local stream during a
meeting it works fine.

I tried debugging the ekiga sessions using '-d 4', I was only able to spot
some FFMPEG errors in the case of my newer distro ("FFMPEG  non-existing
PPS 0 referenced" and then "FFMPEG  decode_slice_header error").

Here are the 2 debugging outputs.

Ubuntu 16.04 Xenial: https://paste.ubuntu.com/p/HJF4Sfwq5y/
Ubuntu 18.04 Bionic: https://paste.ubuntu.com/p/MFkhmnGPk5/

Best regards,
Antoine Merle.
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