"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