python での動画の再生について

pythonでVLCをつかって動画を再生しようとしています。
まず

python
1import vlc
2from time import sleep
3
4Instance = vlc.Instance('--fullscreen')
5player = Instance.media_player_new()
6Media = Instance.media_new('http://techslides.com/demos/sample-videos/small.mp4')
7#Media.get_mrl()
8player.set_media(Media)
9player.play()
10sleep(5) # Or however long you expect it to take to open vlc
11while player.is_playing():
12     sleep(1)

のコードを書いてみました。
これは動作しました。
そこで次にpython-vlcにあるサンプルを改造して

python
1"""
2A simple example for VLC python bindings using PyQt5.
3
4Author: Saveliy Yusufov, Columbia University, sy2685@columbia.edu
5Date: 25 December 2018
6"""
7
8import platform
9import os
10import sys
11
12from PyQt5 import QtWidgets, QtGui, QtCore
13import vlc
14
15class Player(QtWidgets.QMainWindow):
16    """A simple Media Player using VLC and Qt
17    """
18
19    def __init__(self, master=None):
20        QtWidgets.QMainWindow.__init__(self, master)
21        self.setWindowTitle("Media Player")
22
23        # Create a basic vlc instance
24        self.instance = vlc.Instance()
25
26        self.media = None
27
28        # Create an empty vlc media player
29        self.mediaplayer = self.instance.media_player_new()
30
31        self.create_ui()
32        self.is_paused = False
33
34    def create_ui(self):
35        """Set up the user interface, signals & slots
36        """
37        self.widget = QtWidgets.QWidget(self)
38        self.setCentralWidget(self.widget)
39
40        # In this widget, the video will be drawn
41        if platform.system() == "Darwin": # for MacOS
42            self.videoframe = QtWidgets.QMacCocoaViewContainer(0)
43        else:
44            self.videoframe = QtWidgets.QFrame()
45
46        self.palette = self.videoframe.palette()
47        self.palette.setColor(QtGui.QPalette.Window, QtGui.QColor(0, 0, 0))
48        self.videoframe.setPalette(self.palette)
49        self.videoframe.setAutoFillBackground(True)
50
51        self.positionslider = QtWidgets.QSlider(QtCore.Qt.Horizontal, self)
52        self.positionslider.setToolTip("Position")
53        self.positionslider.setMaximum(1000)
54        self.positionslider.sliderMoved.connect(self.set_position)
55        self.positionslider.sliderPressed.connect(self.set_position)
56
57        self.hbuttonbox = QtWidgets.QHBoxLayout()
58        self.playbutton = QtWidgets.QPushButton("Play")
59        self.hbuttonbox.addWidget(self.playbutton)
60        self.playbutton.clicked.connect(self.play_pause)
61
62        self.stopbutton = QtWidgets.QPushButton("Stop")
63        self.hbuttonbox.addWidget(self.stopbutton)
64        self.stopbutton.clicked.connect(self.stop)
65
66        self.hbuttonbox.addStretch(1)
67        self.volumeslider = QtWidgets.QSlider(QtCore.Qt.Horizontal, self)
68        self.volumeslider.setMaximum(100)
69        self.volumeslider.setValue(self.mediaplayer.audio_get_volume())
70        self.volumeslider.setToolTip("Volume")
71        self.hbuttonbox.addWidget(self.volumeslider)
72        self.volumeslider.valueChanged.connect(self.set_volume)
73
74        self.vboxlayout = QtWidgets.QVBoxLayout()
75        self.vboxlayout.addWidget(self.videoframe)
76        self.vboxlayout.addWidget(self.positionslider)
77        self.vboxlayout.addLayout(self.hbuttonbox)
78
79        self.widget.setLayout(self.vboxlayout)
80
81        menu_bar = self.menuBar()
82
83        # File menu
84        file_menu = menu_bar.addMenu("File")
85
86        # Add actions to file menu
87        open_action = QtWidgets.QAction("Load Video", self)
88        close_action = QtWidgets.QAction("Close App", self)
89        file_menu.addAction(open_action)
90        file_menu.addAction(close_action)
91
92        open_action.triggered.connect(self.open_file)
93        close_action.triggered.connect(sys.exit)
94
95        self.timer = QtCore.QTimer(self)
96        self.timer.setInterval(100)
97        self.timer.timeout.connect(self.update_ui)
98
99    def play_pause(self):
100        """Toggle play/pause status
101        """
102        if self.mediaplayer.is_playing():
103            self.mediaplayer.pause()
104            self.playbutton.setText("Play")
105            self.is_paused = True
106            self.timer.stop()
107        else:
108            if self.mediaplayer.play() == -1:
109                self.open_file()
110                return
111
112            self.mediaplayer.play()
113            self.playbutton.setText("Pause")
114            self.timer.start()
115            self.is_paused = False
116
117    def stop(self):
118        """Stop player
119        """
120        self.mediaplayer.stop()
121        self.playbutton.setText("Play")
122
123    def open_file(self):
124        """Open a media file in a MediaPlayer
125        """
126
127
128
129        # getOpenFileName returns a tuple, so use only the actual file name
130        self.media = self.instance.media_new("http://techslides.com/demos/sample-videos/small.mp4")
131
132        # Put the media in the media player
133        self.mediaplayer.set_media(self.media)
134
135        # Parse the metadata of the file
136        self.media.parse()
137
138        # Set the title of the track as window title
139        self.setWindowTitle(self.media.get_meta(0))
140
141        # The media player has to be 'connected' to the QFrame (otherwise the
142        # video would be displayed in it's own window). This is platform
143        # specific, so we must give the ID of the QFrame (or similar object) to
144        # vlc. Different platforms have different functions for this
145        if platform.system() == "Linux": # for Linux using the X Server
146            self.mediaplayer.set_xwindow(int(self.videoframe.winId()))
147        elif platform.system() == "Windows": # for Windows
148            self.mediaplayer.set_hwnd(int(self.videoframe.winId()))
149        elif platform.system() == "Darwin": # for MacOS
150            self.mediaplayer.set_nsobject(int(self.videoframe.winId()))
151
152        self.play_pause()
153
154    def set_volume(self, volume):
155        """Set the volume
156        """
157        self.mediaplayer.audio_set_volume(volume)
158
159    def set_position(self):
160        """Set the movie position according to the position slider.
161        """
162
163        # The vlc MediaPlayer needs a float value between 0 and 1, Qt uses
164        # integer variables, so you need a factor; the higher the factor, the
165        # more precise are the results (1000 should suffice).
166
167        # Set the media position to where the slider was dragged
168        self.timer.stop()
169        pos = self.positionslider.value()
170        self.mediaplayer.set_position(pos / 1000.0)
171        self.timer.start()
172
173    def update_ui(self):
174        """Updates the user interface"""
175
176        # Set the slider's position to its corresponding media position
177        # Note that the setValue function only takes values of type int,
178        # so we must first convert the corresponding media position.
179        media_pos = int(self.mediaplayer.get_position() * 1000)
180        self.positionslider.setValue(media_pos)
181
182        # No need to call this function if nothing is played
183        if not self.mediaplayer.is_playing():
184            self.timer.stop()
185
186            # After the video finished, the play button stills shows "Pause",
187            # which is not the desired behavior of a media player.
188            # This fixes that "bug".
189            if not self.is_paused:
190                self.stop()
191
192def main():
193    """Entry point for our simple vlc player
194    """
195    app = QtWidgets.QApplication(sys.argv)
196    player = Player()
197    player.show()
198    player.resize(640, 480)
199    sys.exit(app.exec_())
200
201if __name__ == "__main__":
202    main()
203

のコードを書いてみたがこれは動作しません。
エラーは
[00000000032f5a10] access stream error: HTTP connection failure
[00000000032f5a10] http stream error: cannot connect to techslides.com:80
です。
なぜHTTPが下のコードだけだめなのかさっぱり分かりません。
HTTPアクセス禁止になっているところがわからない。
なお
self.instance.media_new("http://techslides.com/demos/sample-videos/small.mp4")
をローカルのファイルに変えると動作するのはわかっています。
OSはWINDOWSです。