QWebView and embedded YouTube player - not working properly - qt

Question

My system:
OS: Debian Jessie 64bit
GPU: ATI Mobility Radeon HD 5650 (with proprietary video drivers)
I'm working with PyQt5 and want to embed a QWebView with a YouTube tutorial video inside a QWizardPage. However what I'm getting is the following is really strange:
Video doesn't load at all if I use the embedded link for the video (that is - the embedded YouTube player) which is basically what I want to use and not load the complete YouTube website
If I use the normal link (not embedded) I get not image but there is sound
The playback time is always messed up - I get -Nan:Nan when I however the player's playback trackbar and `
In the terminal (where I start my PyQt5 application from) always gives me the following errors:
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
Especially the last error really baffles me since yes, there is not JACK server running because I don't use JACK (I use PulseAudio and ALSA depending on the case). Does QWebView require JACK on Linux systems?
Here is a screenshot of my QWizard and the respective QWizardPage:
The code I use is as follows (the URL is just an example (video is mine) for the purpose of this post):
class CalibrationPageWelcome(QWizardPage):
'''
Gives an overviewo of the calibration procedure including some external URLs to tutorials
'''
def __init__(self, parent):
super(CalibrationPageWelcome, self).__init__(parent)
self.setTitle('Calibration Wizard')
self.setSubTitle('The wizard will guide you through the process of calibrating your camera device.')
layout = QVBoxLayout()
label = QLabel('''
Before you continue make sure you are familiar with the process of calibration.
The video below will give a brief explanation what the calibration process is for
and how it will be done using this wizard
''')
label.setWordWrap(True)
layout.addWidget(label)
view = QWebView()
# TODO Add link to tutorial about calibrating a camera using patterns and OpenCV
view.load(QUrl('https://www.youtube.com/embed/5sOiGJRyoBI'))
layout.addWidget(view)
self.setLayout(layout)
Any idea what is going on here?

Answer 1

Make sure you have the appropriate GStreamer dependencies installed - on Debian Jessie this should be:
apt-get install gstreamer1.0-plugins-{bad,base,good,ugly}