Details
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Bug
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Resolution: Unresolved
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P2: Important
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None
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6.4.0, 6.5.0 Beta1, 6.7.3
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None
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armeabi-v7a
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Android
Description
Hi
I want to save QVideoFrame of QML MediaPlayer as an image.
Since `videoFrame()` function of QVideoSink no accessible from QML, I have to use a C++ helper to access QVideoSink functionalities.
C++
this class use use Q_OBJECT and QML_ELEMENT
void Helper::saveCurrentFrame(QObject *videoOutput)
{
if (m_sink == nullptr){
m_sink = qvariant_cast<QVideoSink*>(videoOutput->property("videoSink"));
}
m_sink->videoFrame().toImage().save("frame.png");
}
QML
Helper {
id: helper
}
MediaPlayer {
id: player
videoOutput: videoOutput
}
VideoOutput {
id: videoOutput
anchors.fill: parent
}
Button {
text: "save frame"
onClicked: {
helper.saveCurrentFrame(videoOutput)
}
}
But this raise Cannot make QOpenGLContext current in a different thread
and causes the App crash in both Windows and Android.
I was able to hack this error with help of converting QVideoFrame to QImage manually :
QVideoFrame currentFrame = m_sink->videoFrame();
currentFrame.map(QVideoFrame::ReadOnly);
QImage::Format imageFormat = QVideoFrameFormat::imageFormatFromPixelFormat(currentFrame.pixelFormat());
QImage image(currentFrame.bits(0),
currentFrame.width(),
currentFrame.height(),imageFormat);
QImage delegateImage = image.scaled( 400, 200, Qt::KeepAspectRatio);
delegateImage.save("frame.png")
but this trick just works in Windows and not Android.
in Android I'm still getting Cannot make QOpenGLContext current in a different thread.
If you need full sample code just comment please, thank you Qt team.
Attachments
Issue Links
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- Reported
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- Closed
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