def main():
pipeline = Gst.Pipeline("videocontroller")
src = Gst.ElementFactory.make("videotestsrc", "src")
mix = Gst.ElementFactory.make("videomixer", "mix")
conv = Gst.ElementFactory.make("videoconvert", "conv")
sink = Gst.ElementFactory.make("autovideosink", "sink")
pipeline.add(src)
pipeline.add(mix)
pipeline.add(conv)
pipeline.add(sink)
spad = src.get_static_pad('src')
dpad = mix.get_request_pad('sink_%d')
spad.link(dpad)
mix.link(conv)
conv.link(sink)
control = Gst.Controller(dpad, "xpos", "ypos")
control.set_interpolation_mode("xpos", Gst.INTERPOLATE_LINEAR)
control.set_interpolation_mode("ypos", Gst.INTERPOLATE_LINEAR)
control.set("xpos", 0, 0)
control.set("xpos", 5 * Gst.SECOND, 200)
control.set("ypos", 0, 0)
control.set("ypos", 5 * Gst.SECOND, 200)
pipeline.set_state(Gst.STATE_PLAYING)
time.sleep(7)
