# socket.py

import gtk

window = gtk.Window()
window.connect('destroy', gtk.main_quit)
window.set_size_request(600, 400)
socket = gtk.Socket()
window.add(socket)
window.show_all()
print socket.get_id()
gtk.main()

# xv.py

import gtk
import gst
import sys

plug = gtk.Plug(long(sys.argv[1]))
plug.show_all()

pipe = gst.Pipeline()
bin = gst.parse_launch('videotestsrc ! xvimagesink name=xvsink')
xvsink = bin.get_by_name('xvsink')
xvsink.set_xwindow_id(plug.window.xid)
bin.set_state(gst.STATE_PLAYING)

gtk.main()