However I set the pixelformta of camera but I didn't receive that pixelfomat from qabstractvideosurface

Jafar.Sag.Sibil

Look at the following codes however I set the camera pixel format but received formats does not follow the settings also the startTime and endTime both returns -1

I'm using android which everybody said that this OS support NV_21 pixelformat

main.cpp

	QAbstractVideoSurface * surfacer = new VideoSurfacer;

	QCamera cam ( QCameraInfo::availableCameras ( ).at ( 0 ) );
	cam.setCaptureMode ( QCamera::CaptureMode::CaptureViewfinder );
	cam.setViewfinder ( surfacer );

	QCameraViewfinderSettings settings = cam.viewfinderSettings ( );
	settings.setMaximumFrameRate ( 5 );
	settings.setMinimumFrameRate ( 1 );
	settings.setPixelAspectRatio ( 4, 3 );
	settings.setPixelFormat ( QVideoFrame::Format_NV21 );
	settings.setResolution ( 800, 600 );
	cam.setViewfinderSettings ( settings );

	cam.start ( );

	qDebug ( ) << cam.viewfinderSettings ( ).pixelFormat ( ) << endl; // Format NV_21

videosurfacer.cpp

bool VideoSurfacer::present ( const QVideoFrame & f )
{
	QVideoFrame frame ( f );
	if ( frame.isValid ( ) && frame.map ( QAbstractVideoBuffer::MapMode::ReadOnly ) )
		{
			qDebug ( ) << frame.pixelFormat ( ) << endl; //Format_ABGR32
			frame.unmap ( );
		}
	return true;
}

SGaist

Hi,

Did you check the values returned by QCamera::supportedViewfinderPixelFormats ?

Jafar.Sag.Sibil

Yes returns a list with size of 0

SGaist

How did you called ?

Jafar.Sag.Sibil

qDebug ( ) << cam.supportedViewfinderSettings ( ).size ( ) << endl; // output is : 0

Jafar.Sag.Sibil

@SGaist also

	qDebug ( ) << cam.supportedViewfinderPixelFormats ( settings ).size ( ) << endl;

didn't show anything other than 0

Jafar.Sag.Sibil

@SGaist I use an example of QML which works (only a camera with a videooutput) how can I get the pixelformat of this project video frames?

SGaist

IIRC, QtQuick video's output supports a larger range of formats without conversions or rather, the conversion is done in the last shader of the rendering pipeline,