Hi Alexis,
Just to check, this is my configuration in /camera.
! h264parse
! queue
! rtph264pay config-interval=10 pt=96
! multiudpsink clients=192.168.2.1:5600,192.168.2.1:2000
And this is my sdp file using port 2000.
c=IN IP4 127.0.0.1
m=video 2000 RTP/AVP 96
a=rtpmap:96 H264/90000
And as result, I can use QGC and VLC at the same time (video).
VLC (with port 2000) is not working when you open QGC (with port 5600) ?