I installed Jitsi on my Trisquel os. In order for Jitsi to see my external webcam I use: bash -c "LD_PRELOAD=/usr/lib/i386-linux-gnu/libv4l/v4l2convert.so jitsi" .
When I start a video call, I can hear the pearson I'm talking with and the pearson can see me and hear me well, but I can't see that pearson or my self. I only see that the Jitsi window is modifing the size like is preparing for the video resolution, but I can only see a black window with a "X" button somwhere in the middle of this black window.
The video calls were made only with a Windows computer, so I don't know how Jitsi is reacting if I'm called from GnuLinux, but I think it's a Jitsi-Trisquel issue.
I saw that some other people had this problem, too. If somebody knows the fix, please help.