1#!/usr/bin/python 2import gobject; gobject.threads_init() 3import pygst; pygst.require("0.10") 4import gst 5 6p = gst.parse_launch (""" 7 v4l2src ! 8 videoconvert ! queue ! video/x-raw,width=320,height=240,framerate=30/1 ! burn qos=true name=vf ! videoconvert ! timeoverlay ! xvimagesink 9 """) 10 11m = p.get_by_name ("vf") 12m.set_property ("adjustment", 128) 13 14control = gst.Controller(m, "adjustment") 15control.set_interpolation_mode("adjustment", gst.INTERPOLATE_LINEAR) 16control.set("adjustment", 0 * gst.SECOND, 128) 17control.set("adjustment", 5 * gst.SECOND, 256) 18control.set("adjustment", 25 * gst.SECOND, 0) 19 20p.set_state (gst.STATE_PLAYING) 21 22gobject.MainLoop().run() 23