[Interest] QVideoWidget Error: /Library/Caches/com.apple.xbs/Sources/AppleGVA/AppleGVA-10.1.16/Sources/Slices/Driver/AVD_loader.cpp: failed to get a service for display <n>

[Byron Formwalt]

Correction:  The following code is necessary to reproduce Problem 2, cited in my original inquiry.

#!/usr/bin/env python3

from PyQt5.QtCore import *
from PyQt5.QtMultimedia import *
from PyQt5.QtMultimediaWidgets import *
from PyQt5.QtWidgets import *
import sys
import os


def handle_error(mp,e):
    print("Error!: {} ({})".format(mp.errorString(),e))

def state_changed(mp,s):
    if s == QMediaPlayer.StoppedState:
        state = "Stopped"
        mp.setPosition(0) # Set playback position in ms since the beginning.
        mp.play()
    elif s == QMediaPlayer.PlayingState:
        state = "Playing"
    elif s == QMediaPlayer.PausedState:
        state = "Paused"
    else:
        state = "Unknown"
    print("Media player state changed to: {} (mp.state() -> {})".format(state,mp.state()))



if __name__ == '__main__':
    app = QApplication(sys.argv)

    video_path = os.path.join(os.environ['HOME'],'Movies')
    video_name = 'test.mp4'
    
    video_pathname = os.path.join(video_path,video_name)
    print("Loading Video: {}".format(video_pathname))
    layout = QVBoxLayout()

    vw = QVideoWidget()
    mp = QMediaPlayer()
    mp.error.connect(lambda e: handle_error(mp,e))
    mp.stateChanged.connect(lambda s: state_changed(mp,s))
    mp.setVideoOutput(vw)
    mp.setMedia(QMediaContent(QUrl("file://"+video_pathname)))

    w = QWidget()
    layout = QVBoxLayout()
    label = QLabel("HELLO")
    label.setAlignment(Qt.AlignVCenter|Qt.AlignHCenter)
    layout.addWidget(label)
    layout.addWidget(vw)
    w.setLayout(layout)

    window = QMainWindow()
    window.setCentralWidget(w)
    window.show()

    mp.play()
    app.exec_()



> On Jul 7, 2017, at 10:26 PM, Byron Formwalt <byron at fastmail.net> wrote:
> 
> Configuration: PyQt 5.9 with Python 3.6.1 on macOS 10.12.5
> 
> Problem: I am evaluating PyQt as a means of playing back videos within a UI.  I am including a simple Python script that reproduces the following three problems:
> 
>   1. When the video plays back it is not scaled to fit the widget.  Instead, the pixel ration is set 1:1 and playback is clipped accordingly by the bounds of the QVideoWidget.  When the window is resized, the video does get rescaled.  
> 
>   2. When the window is set to full-screen mode, playback is blocked unless the user moves the mouse into the menubar or exits full screen mode.
> 
>   3. The following error appears almost immediately after playback begins:  "/Library/Caches/com.apple.xbs/Sources/AppleGVA/AppleGVA-10.1.16/Sources/Slices/Driver/AVD_loader.cpp: failed to get a service for display 4”
> 
> Discussion:  I am writing to see if other users have experienced this issue, and if so, has anyone discovered a remedy?
> 
> Source:
> #!/usr/bin/env python3
> 
> from PyQt5.QtCore import *
> from PyQt5.QtMultimedia import *
> from PyQt5.QtMultimediaWidgets import *
> from PyQt5.QtWidgets import *
> import sys
> import os
> 
> 
> def handle_error(mp,e):
>     print("Error!: {} ({})".format(mp.errorString(),e))
> 
> def state_changed(mp,s):
>     if s == QMediaPlayer.StoppedState:
>         state = "Stopped"
>         mp.setPosition(0) # Set playback position in ms since the beginning.
>         mp.play()
>     elif s == QMediaPlayer.PlayingState:
>         state = "Playing"
>     elif s == QMediaPlayer.PausedState:
>         state = "Paused"
>     else:
>         state = "Unknown"
>     print("Media player state changed to: {} (mp.state() -> {})".format(state,mp.state()))
> 
> 
> if __name__ == '__main__':
>     app = QApplication(sys.argv)
> 
>     video_path = os.path.join(os.environ['HOME'],'Movies')
>     video_name = 'test.mp4'
>     
>     video_pathname = os.path.join(video_path,video_name)
>     print("Loading Video: {}".format(video_pathname))
>     layout = QVBoxLayout()
> 
>     vw = QVideoWidget()
>     mp = QMediaPlayer()
>     mp.error.connect(lambda e: handle_error(mp,e))
>     mp.stateChanged.connect(lambda s: state_changed(mp,s))
>     mp.setVideoOutput(vw)
>     mp.setMedia(QMediaContent(QUrl("file://"+video_pathname)))
> 
>     window = QMainWindow()
>     window.setCentralWidget(vw)
>     window.show()
> 
>     mp.play()
>     app.exec_()
> Relevant Output:
> Media player state changed to: Playing (mp.state() -> 1)
> /Library/Caches/com.apple.xbs/Sources/AppleGVA/AppleGVA-10.1.16/Sources/Slices/Driver/AVD_loader.cpp: failed to get a service for display 4 
> 
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