How to record video in windows using Qt?

[Ramiz]

I have tried to record it but nothing records.
Here is the code

    recorder=new QMediaRecorder(mCamera,this);
    QVideoEncoderSettings settings = recorder->videoSettings();
    settings.setResolution(640,480);
    settings.setQuality(QMultimedia::VeryHighQuality);
    settings.setFrameRate(30.0);
    settings.setCodec("video/mp4");
    recorder->setVideoSettings(settings);
    recorder->setContainerFormat("mp4");

    mCamera->setCaptureMode(QCamera::CaptureVideo);
    mCamera->focus();

    auto fileName = QFileDialog::getSaveFileName(this,"Capture","/","Video(*.mp4)");
    recorder->setOutputLocation(QUrl::fromLocalFile(fileName));
    recorder->record();

[jsulm]

@Ramiz You should connect a slot to http://doc.qt.io/qt-5/qmediarecorder.html#error-1 and print errors

[Ramiz]

It didnt work I connect it and found no error.

[jsulm]

@Ramiz There are signals for state/status changes you should connect to them to see whether anything is happening.

[Ramiz]

I am new to QT and what I did I create a button and on that button I write the camera recording code and image capturing code.Image capturing is working fine but recording is not.
Also I write the connect function that you told me on button click.
Did I do it right?

[jsulm]

@Ramiz Should be fine. Are your slots called? Recording video depends on availability of codecs, are you on Windows, MacOS or Linux?

[Ramiz]

I am on windows 10 and Yes My slots are called.
My camera works when slots are called also when I clicked on stop record it ask me where you want to save the file in mp4.
After giving a directory to save I couldn't find the file as well but I can see the file in my Quick access.

[jsulm]

@Ramiz So it actually recorded something? Can you open these files?
And in your slots you should print out the state/status to see what happens.

[Ramiz]

The size of these files are 0 bytes and they are not opening.Whenever I tried to open any of these files, get an error cant open file.

[jsulm]

@Ramiz Do you get QMediaRecorder::RecordingState or or QMediaRecorder::RecordingStatus or anything else?

[Ramiz]

No I didn't get QMediaRecorder::RecordingState or or QMediaRecorder::RecordingStatus

[mchinand]

I don't think video recording with QT is possible on Windows, see: http://doc.qt.io/qt-5/qtmultimedia-windows.html

Also, check the return value of mCamera->isCaptureModeSupported(QCamera::CaptureVideo);.

[Ramiz]

It means I cannot control an IP camera through QT on windows?

[SGaist]

Hi,

Depending on the camera type and how it is seen by the system, you may have to write a small QCamera backend but it's doable.