First, as my "packaging" method is rudimentary, it sometimes fails to properly install unless you untar from the /home/adent directory. Because the configure scripts often incorporate hardcoded directory names into the Makefiles of each package as they are compiled, if you install from another directory as you have done, sometimes it will appear to install correctly but will have errors. Obviously xclip installed correctly though.
Secondly, you should not have to run anything as root although if you do, you would also want to add "export DISPLAY=:0" to /root/.bashrc along with the export XAUTHORITY line you noted.
You might want to verify that the various pieces are working by running "mplayer --help" which verifies that the program runs, "python -V" which should show the python version as 2.5.2, and also verify that the 3 youtube* scripts have "chmod 755" applied to them so they are executable.
PS2 v9 NTSC, PS2 v12 NTSC, PS2 v15 VESA