blue videos with QGraphicsProxyWidget

[Milan Herbig]

Since Ubuntu 14.04 LTS I have problem with displaying videos through QGraphicsProxyWidget. All videos are blue colored. Everything works fine with phonon-backend-vlc, and worked flawlessly on ubuntu 13.10 and older.

Platform: Ubuntu 14.04 (latest) x64 - all derivates are the same
Python: 2.7+ and PySide 1.2.1 or PyQt 4.10.4
Package version: phonon-backend-gstreamer 4.7.1+git20140403-0ubuntu1

Code to reproduce bug: (works both on PySide and PyQt)
------------------------------------------------------------------------------------------------------------------------------
from PyQt4.QtGui import *
from PyQt4.QtCore import *
from PyQt4.phonon import Phonon

app = QApplication([])
app.setApplicationName("MyApp")
file_path = u"/home/milan/small.mp4" # change here!

gv = QGraphicsView()
scene = QGraphicsScene(gv)
gv.setScene(scene)

media_src = Phonon.MediaSource(file_path)
media_obj = Phonon.MediaObject()
media_obj.setCurrentSource(media_src)
video_widget = Phonon.VideoWidget()
audio_out = Phonon.AudioOutput(Phonon.VideoCategory)
Phonon.createPath(media_obj, video_widget)
Phonon.createPath(media_obj, audio_out)
playerProxy = scene.addWidget(video_widget)

# rect = QGraphicsRectItem(0, 0, 100, 100)
# rect.setBrush(Qt.red)
# rect.setFlag(QGraphicsItem.ItemIsMovable)
# scene.addItem(rect)

media_obj.play()
gv.show()
app.exec_()
-------------------------------------------------------------------------------------------------------------------------

Code without QGraphicsProxyWidget: (to test phonon functionality)
-------------------------------------------------------------------------------------------------------------------------
from PyQt4.QtGui import *
from PyQt4.QtCore import *
from PyQt4.phonon import Phonon

app = QApplication([])
app.setApplicationName("MyApp")
file_path = u"/home/milan/small.mp4" # change here !

media_src = Phonon.MediaSource(file_path)
media_obj = Phonon.MediaObject()
media_obj.setCurrentSource(media_src)
video_widget = Phonon.VideoWidget()
audio_out = Phonon.AudioOutput(Phonon.VideoCategory)
Phonon.createPath(media_obj, video_widget)
Phonon.createPath(media_obj, audio_out)

media_obj.play()
video_widget.show()

app.exec_()
--------------------------------------------------------------------------------------------------------------------------

Since phonon-backend-gstreamer version has been updated to 4.7.1 with Ubuntu 14.04, I believe this is a bug which needs to be fixed.

Edit: Downgrading phonon-backend-gstreamer to version from Ubuntu 13.10 works fine.

Edit 2: This issue also affects Ubuntu 14.10 official beta (for now).