Gstreamer sample mosaic

gistfile1.py

#!/usr/bin/python

import pygst
pygst.require("0.10")
import gst
import pygtk
import gtk

'''
gst-launch -e videomixer name=mix \
sink_0::xpos=0 sink_0::ypos=0 sink_0::alpha=0 \
sink_1::xpos=100 sink_1::ypos=50 \
! xvimagesink \
videotestsrc \
! video/x-raw-yuv,width=600,height=200 \
! mix.sink_0 \
videotestsrc pattern=0 \
! video/x-raw-yuv,width=100,height=100 \
! mix.sink_1 
'''


class Main:
    def __init__(self):
		self.pipeline = gst.Pipeline("mypipeline")

		#self.videotestsrc = gst.element_factory_make("videotestsrc", "videoin")
		
		source = gst.element_factory_make("videotestsrc", "video-source-bg")
		source1 = gst.element_factory_make("videotestsrc", "video-source1")
		source1.set_property("pattern",0)
		source2 = gst.element_factory_make("videotestsrc", "video-source2")
		source2.set_property("pattern",4)
		
		sink = gst.element_factory_make("xvimagesink", "video-output")
		caps_bg = gst.Caps("video/x-raw-yuv, width=600, height=200")
		filter = gst.element_factory_make("capsfilter", "filter-bg")
		filter.set_property("caps", caps_bg)
		filter_src_pad=filter.get_pad("src")
		
		caps1 = gst.Caps("video/x-raw-yuv, width=100, height=100")
		filter1 = gst.element_factory_make("capsfilter", "filter1")
		filter1.set_property("caps", caps1)
		filter1_src_pad=filter1.get_pad("src")
		
		caps2 = gst.Caps("video/x-raw-yuv, width=100, height=100")
		filter2 = gst.element_factory_make("capsfilter", "filter2")
		filter2.set_property("caps", caps2)
		filter2_src_pad=filter2.get_pad("src")
		
		mixer = gst.element_factory_make("videomixer", "mixer")
		#mixer.set_property("background",3)
		
		#self.bin = gst.Bin("my-bin")
		pad0 = mixer.get_pad("sink_0")
		#pad0 = gst.Element.get_pad("sink_0")
		pad1 = mixer.get_pad("sink_1")
		pad2 = mixer.get_pad("sink_2")
		
		#sink_0
		pad0.set_property("xpos",0)
		pad0.set_property("ypos",0)
		pad0.set_property("alpha",0)
		
		#sink_1
		pad1.set_property("xpos",0)
		pad1.set_property("ypos",0)

		#sink_2
		pad2.set_property("xpos",200)
		pad2.set_property("ypos",0)
		
		#get src pad of stream1, attach it to sink_%d of videomixer
		#we add all elements into the pipeline
		self.pipeline.add(source,filter,mixer,sink)
		self.pipeline.add(source1,filter1)
		self.pipeline.add(source2,filter2)

		#we link the elements together
		gst.element_link_many(source,filter)
		gst.element_link_many(source1,filter1)
		gst.element_link_many(source2,filter2)
		#link pad manually
		filter_src_pad.link(pad0)
		#filter.link_pads(filter_src_pad,mixer,pad0)
		filter1_src_pad.link(pad1)
		filter2_src_pad.link(pad2)
		
		#mixer.link(sink)
		gst.element_link_many(mixer,sink)

		self.pipeline.set_state(gst.STATE_PLAYING)

start=Main()
gtk.main()