play-media.py

#!/usr/bin/env python
"""Play a media (audio/video) file using GStreamer.

To install Gstreamer and its Python bindings on Ubuntu, run:

    $ sudo apt-get install python-gi python3-gi \
        gstreamer1.0-tools \
        gir1.2-gstreamer-1.0 \
        gir1.2-gst-plugins-base-1.0 \
        gstreamer1.0-plugins-good \
        gstreamer1.0-plugins-ugly \
        gstreamer1.0-plugins-bad \
        gstreamer1.0-libav
"""
import os
import sys
try:
    from urllib.parse import urljoin
    from urllib.request import pathname2url
except ImportError: # Python 2
    from urlparse import urljoin
    from urllib import pathname2url

from gi.repository import GObject, Gst
Gst.init(None)

loop_playback = True

def path2url(path):
    return urljoin('file:', pathname2url(os.path.abspath(path)))

def on_bus_msg(bus, msg):
    # from https://github.com/vigsterkr/pi-wall/blob/master/src/player.py
    if msg is None:
        return
    elif msg.type is Gst.MessageType.EOS:
        if loop_playback:
            player.seek_simple(Gst.Format.TIME,
                               Gst.SeekFlags.FLUSH | Gst.SeekFlags.KEY_UNIT,
                               0)
        else:
            sys.exit()
    elif msg.type is Gst.MessageType.ERROR:
        print("Got message of type ", msg.type)
        print("Got message of src ", msg.src)
        print("Got message of error ", msg.parse_error())
        player.set_state(Gst.State.NULL)
        sys.exit('error')
    else:
        pass # ignore other messages

media_uri = path2url(sys.argv[1]) # file:// url to play
print(media_uri)
player = Gst.ElementFactory.make('playbin', None)
player.set_property('uri', media_uri)
bus = player.get_bus()
watch_id = bus.connect("message", on_bus_msg) # listen for GStreamer's messages
bus.add_signal_watch()
player.set_state(Gst.State.PLAYING)
print('Press Ctrl-C to exit...')
try:
    GObject.MainLoop().run()
except KeyboardInterrupt:
    pass
finally:
    player.set_state(Gst.State.NULL)
    bus.remove_signal_watch()
    bus.disconnect(watch_id)