Hello, my name is Andrei. It's my first bid on this site. Sorry my speaking English is not good (but reading is very good, writing is not too bad, professional terms is OK).
I'm working with many main open source multimedia frameworks, libraries and tools:
Gstreamer (e.g. modules developing), Clutter, FFmpeg, SDL, Unicap, v4l2, DShow, VideoInput, rtmpdump, OpenGL, QtQuick, QML, Qt3D, 3D-fonts, ODE, PyGame, Pyglet, etc.
And gui toolkits:
GTK, Qt, wxWidgets.
Usually to catching unknown stream I sniff traffic with WireShark first and find out the connecting parameters.