"No QtMultimedia backends found" on MacOS with PySide 6.7.1

[LeBeef]

Dear Community,

since I upgraded from PySide 6.7.0 to 6.7.1, my qml video playback is not working any more. I tested it on MacOS 12.7 and 14.5 and I got the same error:

No QtMultimedia backends found. Only QMediaDevices, QAudioDevice, QSoundEffect, QAudioSink, and QAudioSource are available.
Failed to create QVideoSink "Not available"
Failed to initialize QMediaPlayer "Not available"

When I roll back to 6.7.0 it works.
Does anybody have the same issues or knows how to solve them?

Kind regards
Nils

[SGaist]

Hi,

I wonder if there was a packaging issue with 6.7.1.

Can you provide a minimal script that shows this in order to be sure the problem can be reproduced ?

[LeBeef]

Here is quick example for 6.7.1 which makes the warning show up.

run.py

import sys

from PySide6.QtGui import QGuiApplication
from PySide6.QtQml import QQmlApplicationEngine

app = QGuiApplication(sys.argv)

engine = QQmlApplicationEngine()
engine.quit.connect(app.quit)
engine.load("window.qml")

sys.exit(app.exec())

window.qml

import QtQuick
import QtQuick.Window
import QtMultimedia

Window {
    id: mainWindow

    width: 1200
    height: 800
    visible: true

    Video {
        anchors.fill: parent
    }

    Shortcut {
        sequence: "Esc"
        onActivated: Qt.quit()
    }
}

[Shyamnath]

The issue has been fixed and should be available in the next release.

https://bugreports.qt.io/browse/PYSIDE-2656

[bohning]

The problem still occurs with PySide 6.7.2 (downgrade to 6.7.0 resolves the issue).

[SGaist]

From the looks of the bug report and related patches, the macOS wheel required update was integrated after the release of 6.7.2.

[bohning]

Is there a date for a release of 6.7.3 for macOS? I am facing this issue at the moment.

[SGaist]

From the current tentative plan, it seems to be by the end of august.

[bohning]

@SGaist Thanks for the linked tentative plan, I was looking for that but didn't find it. A whole month to go... :-( Thanks anyways!

[SimonLiu]

@SGaist Is there any workaround to fix this issue before 6.7.3?

[SGaist]

@SimonLiu Two options:

• Use an earlier version
• Build PySide6 yourself