gstreamer - caps filter 1

#!/usr/bin/env python3
# -*- coding:utf-8 -*-

import sys
import gi
gi.require_version('Gst', '1.0')
from gi.repository import Gst
Gst.init(None)

#pipeline = Gst.parse_launch("v4l2src device=/dev/video0 ! 'video/x-raw,format=YUY2,width=320,height=240' ! x264enc tune=zerolatency ! mp4mux ! filesink location=/tmp/file.mp4")
pipeline = Gst.parse_launch("v4l2src device=/dev/video0 ! x264enc name=X tune=zerolatency ! mp4mux ! filesink location=/tmp/file.mp4")

# Start playing
pipeline.set_state(Gst.State.PLAYING)

applyFilter = pipeline.get_by_name('X')

while True:
    print "+ [1], - [2], end [0]"
    x = raw_input()

    if x=='0':
        print "END"
        bus = pipeline.get_bus()
        bus.add_signal_watch()
        pipeline.send_event(Gst.Event.new_eos())
        msg = bus.timed_pop_filtered(Gst.CLOCK_TIME_NONE, Gst.MessageType.ERROR | Gst.MessageType.EOS)
        pipeline.set_state(Gst.State.NULL)
        sys.exit()

    elif x=='1':
        print "+"
        caps1 = Gst.Caps.from_string("video/x-raw,width=1280,height=720")
        capsFilter1 = Gst.ElementFactory.make("capsfilter", "filter1")
        capsFilter1.set_property("caps", caps1)
        #pipeline.add(capsFilter1)
        applyFilter.add(capsFilter1)

    elif x=='2':
        print "-"
        caps2 = Gst.Caps.from_string("video/x-raw,width=320,height=240")
        capsFilter2 = Gst.ElementFactory.make("capsfilter", "filter2")
        capsFilter2.set_property("caps", caps2)
        #pipeline.add(capsFilter2)
        applyFilter.add(capsFilter2)

    else:
        print "wtf"