failure of state changing

[Vladimir90]

Hi every body
I'm trying to implement this pipeline on python:
gst-launch-1.0 videotestsrc ! theoraenc ! oggmux ! filesink
location=/home/../Desktop/newdeg.ogg

So this is the code i've been trying so far: 
import sys, os
from os import path
import gi
gi.require_version('Gst', '1.0')
from gi.repository import GObject, Gtk, Gst


GObject.threads_init()
Gst.init(None)
filename = path.join(path.dirname(path.abspath(__file__)), 'celine.mp4')
uri = filename

pipeline = Gst.Pipeline()

video_source = Gst.ElementFactory.make('filesrc', None)
encoding = Gst.ElementFactory.make('theoraenc', None)
muxing = Gst.ElementFactory.make('oggmux', None) 
saving = Gst.ElementFactory.make('filesink', None)

if (not pipeline or not video_source or not encoding or not muxing or not
saving):
    print('Not all elements could be created.')
    exit(-1)

pipeline.add(video_source)
pipeline.add(encoding)
pipeline.add(muxing)
pipeline.add(saving)

if not Gst.Element.link(video_source, encoding):
	print("Elements 1,2 could not be linked.")
    	exit(-1)


if not Gst.Element.link(encoding, muxing):
	print("Elements 2,3 could not be linked.")
    	exit(-1)

if not Gst.Element.link(muxing, saving):
	print("Elements 3,4 could not be linked.")
    	exit(-1)

#back=pipeline.set_state(4)

back=pipeline.set_state(Gst.State.PLAYING)
print('pipeline',back)

bus = pipeline.get_bus()

msg = bus.timed_pop_filtered(Gst.CLOCK_TIME_NONE,Gst.MessageType.ERROR |
Gst.MessageType.EOS)
print msg

pipeline.set_state(Gst.State.NULL)


I don't understand why i'm getting the error "state change failure"

any help will be very appreciated



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