Python-vlc error: HTTP connection failure

Question

我正在尝试使用 python-vlc 库播放在线视频。

首先，我使用简单版本的播放器进行测试：

import vlc

#example url
url="https://player.vimeo.com/external/363536021.hd.mp4?s=6f6e87d86a49149479ebdab6c8bc421aa89f327c&profile_id=175&oauth2_token_id=57447761"
player = vlc.Instance().media_player_new()
player.set_media(vlc.Instance().media_new(url))
player.play()


while str(player.get_state()) != "State.Ended":
    pass
player.stop()

播放来自 URL 的 while 视频没有任何问题！

现在我想使用带有 pyqt5 GUI (original source-code here) 的更复杂的版本：

import sys

import os.path
from PyQt5.QtCore import Qt, QTimer
from PyQt5.QtGui import QPalette, QColor
from PyQt5.QtWidgets import QMainWindow, QWidget, QFrame, QSlider, QHBoxLayout, QPushButton, \
    QVBoxLayout, QAction, QFileDialog, QApplication
import vlc

class Player(QMainWindow):
    def __init__(self, videoUrl, master=None):
        QMainWindow.__init__(self, master)
        self.setWindowTitle("Media Player")

        # creating a basic vlc instance
        self.instance = vlc.Instance()
        # creating an empty vlc media player
        self.mediaplayer = self.instance.media_player_new()
        self.playableVideo = videoUrl

        self.createUI()
        self.isPaused = False

    def createUI(self):
        """Set up the user interface, signals & slots
        """
        self.widget = QWidget(self)
        self.setCentralWidget(self.widget)

        # In this widget, the video will be drawn
        if sys.platform == "darwin": # for MacOS
            from PyQt5.QtWidgets import QMacCocoaViewContainer  
            self.videoframe = QMacCocoaViewContainer(0)
        else:
            self.videoframe = QFrame()
        self.palette = self.videoframe.palette()
        self.palette.setColor (QPalette.Window,
                               QColor(0,0,0))
        self.videoframe.setPalette(self.palette)
        self.videoframe.setAutoFillBackground(True)

        self.positionslider = QSlider(Qt.Horizontal, self)
        self.positionslider.setToolTip("Position")
        self.positionslider.setMaximum(5000)
        self.positionslider.sliderMoved.connect(self.setPosition)

        self.hbuttonbox = QHBoxLayout()
        self.playbutton = QPushButton("Play")
        self.hbuttonbox.addWidget(self.playbutton)
        self.playbutton.clicked.connect(self.PlayPause)

        self.stopbutton = QPushButton("Exit")
        self.hbuttonbox.addWidget(self.stopbutton)
        self.stopbutton.clicked.connect(self.Stop)

        self.hbuttonbox.setAlignment(Qt.AlignHCenter)

        self.vboxlayout = QVBoxLayout()
        self.vboxlayout.addWidget(self.videoframe)
        self.vboxlayout.addWidget(self.positionslider)
        self.vboxlayout.addLayout(self.hbuttonbox)

        self.widget.setLayout(self.vboxlayout)

        self.timer = QTimer(self)
        self.timer.setInterval(200)
        self.timer.timeout.connect(self.updateUI)

    def PlayPause(self):
        """Toggle play/pause status
        """
        if self.mediaplayer.is_playing():
            self.mediaplayer.pause()
            self.playbutton.setText("Play")
            self.isPaused = True
        else:
            if self.mediaplayer.play() == -1:
                self.OpenFile()
                return
            self.mediaplayer.play()
            self.playbutton.setText("Pause")
            self.timer.start()
            self.isPaused = False

    def Stop(self):
        """Stop player
        """
        self.mediaplayer.stop()
        self.playbutton.setText("Play")

    def OpenFile(self, filename=None):
        """Open a media file in a MediaPlayer
        """
        if filename is None:
            filename = self.playableVideo
        if not filename:
            return

        # create the media
        if sys.version < '3':
            filename = unicode(filename)
        self.media = self.instance.media_new(filename)
        # put the media in the media player
        self.mediaplayer.set_media(self.media)

        # parse the metadata of the file
        self.media.parse()
        # set the title of the track as window title
        self.setWindowTitle(self.media.get_meta(0))

        # the media player has to be 'connected' to the QFrame
        # (otherwise a video would be displayed in it's own window)
        # this is platform specific!
        # you have to give the id of the QFrame (or similar object) to
        # vlc, different platforms have different functions for this
        if sys.platform.startswith('linux'): # for Linux using the X Server
            self.mediaplayer.set_xwindow(self.videoframe.winId())
        elif sys.platform == "win32": # for Windows
            self.mediaplayer.set_hwnd(self.videoframe.winId())
        elif sys.platform == "darwin": # for MacOS
            self.mediaplayer.set_nsobject(int(self.videoframe.winId()))
        self.PlayPause()

    def setPosition(self, position):
        self.mediaplayer.set_position(position / 1000.0)

    def updateUI(self):
        self.positionslider.setValue(self.mediaplayer.get_position() * 1000)

        if not self.mediaplayer.is_playing():
            self.timer.stop()
            if not self.isPaused:
                self.Stop()

if __name__ == "__main__":
    app = QApplication(sys.argv)
    player = Player("https://player.vimeo.com/external/363536021.hd.mp4?s=6f6e87d86a49149479ebdab6c8bc421aa89f327c&profile_id=175&oauth2_token_id=57447761")
    player.show()
    player.resize(640, 480)
    if sys.argv[1:]:
        player.OpenFile(sys.argv[1])
    sys.exit(app.exec_())

此代码不断返回 access stream error: HTTP connection failure。

Answer 1

问题是，一旦您开始播放视频，它就无法使用，因为下载不是立即进行的，但是您尝试使用您的代码更新位置。解决方法是update就是开始播放后获取位置：

def updateUI(self):
    <b>if not self.mediaplayer.is_playing():
        return</b>
    self.positionslider.setValue(self.mediaplayer.get_position() * 1000)
    if not self.mediaplayer.is_playing():
        self.timer.stop()
        if not self.isPaused:
            self.Stop()