Always display frame of QVideoWidget

James Whiteley

I have a widget called ThumbnailVideoWidget which plays a short video clip with included play button and position slider widgets. I am using PySide2-5.9.0a1.

My issues are:

Initially no frames are shown in the QVideoWidget, its just a transparent background. Is there a way to initialize a QVideoWidget/QMediaPlayer with a video and display the first frame automatically?
When I click play and then pause, everything plays properly but when I move my mouse off of the play button, the video goes blank/transparent again. The expected behavior would be to stop and keep on the current frame.

Source code of widget:

class ThumbnailVideoWidget(QtWidgets.QWidget):

    def __init__(self, path, parent=None):
        super(ThumbnailVideoWidget, self).__init__(parent)
        self.setup_ui()
        self.connect_signals()
        self.set_media(path)


    def setup_ui(self):
        self.media_player = QtMultimedia.QMediaPlayer(self, QtMultimedia.QMediaPlayer.VideoSurface)
        self.w_video = QtMultimediaWidgets.QVideoWidget()
        self.b_play = QtWidgets.QPushButton()
        self.b_play.setEnabled(False)
        self.b_play.setIcon(self.style().standardIcon(QtWidgets.QStyle.SP_MediaPlay))
        self.position_slider = QtWidgets.QSlider(QtCore.Qt.Horizontal)
        self.position_slider.setRange(0, 0)

        self.media_player.setVideoOutput(self.w_video)
        self.lyt_main = QtWidgets.QVBoxLayout()
        self.lyt_main.addWidget(self.w_video)
        self.lyt_main.addWidget(self.b_play)
        self.lyt_main.addWidget(self.position_slider)
        self.setLayout(self.lyt_main)


    def connect_signals(self):
        self.position_slider.sliderMoved.connect(self.set_position)
        self.b_play.clicked.connect(self.play)
        self.media_player.stateChanged.connect(self.media_state_changed)
        self.media_player.positionChanged.connect(self.position_changed)
        self.media_player.durationChanged.connect(self.duration_changed)

    
    def set_media(self, path):
        self.media_player.setMedia(QtCore.QUrl.fromLocalFile(path))
        self.b_play.setEnabled(True)


    def play(self):
        if self.media_player.state() == QtMultimedia.QMediaPlayer.PlayingState:
            self.media_player.pause()
        else:
            self.media_player.play()


    def set_position(self, position):
        self.media_player.setPosition(position)


    def media_state_changed(self, state):
        if self.media_player.state() == QtMultimedia.QMediaPlayer.PlayingState:
            self.b_play.setIcon(self.style().standardIcon(QtWidgets.QStyle.SP_MediaPause))
        else:
            self.b_play.setIcon(self.style().standardIcon(QtWidgets.QStyle.SP_MediaPlay))


    def position_changed(self, position):
        self.position_slider.setValue(position)


    def duration_changed(self, duration):
        self.position_slider.setRange(0, duration)
        interval = int(float(duration) / 10.0)
        self.media_player.setNotifyInterval(interval)

SGaist

Hi,

This version of PySide2 being pretty old, I would recommend updating before digging further.

Also, what OS are you running that on ?
How did you install PySide2 ?

James Whiteley

@SGaist We built it from source a long long time ago. I'm on Windows 64-bit. I'll try upgrading PySide2 real quick and see if that fixes the issue.

James Whiteley

@SGaist Ah you know I think we would need to rebuild python27 due to MSVC for our tools. Maybe I will just try going python3/PyQt5 route and get back to you.

SGaist

You can install it using pip, no need to build it from scratch.

James Whiteley

@SGaist The pip install for PySide2 only seems to work with python 3.

SGaist

Ah yes, it seems that there's indeed no Py27 per-built package for Windows.

James Whiteley

@SGaist Just got back into this, upgrading to the latest PyQt5 w/ Python3 solved the issue.

SGaist

Great !

The please mark the thread as solved using the "Topic Tools" button or the three doted menu beside the answer you deem correct so that other forum users may know a solution has been found :-)