Camera element on N8
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Hello, I have created a simple QML app for exercising the Camera example taken from http://doc.qt.nokia.com/qtmobility/qml-multimedia.html
I have added all the relevant header files and Symbian capabilities but it seems the camera doesn't show any content when the application starts on the N8. I can see only a white background. Here is the main.qml file
@
import Qt 4.7
import QtMultimediaKit 1.1Camera {
focus : visible // to receive focus and capture key events when visibleflashMode: Camera.FlashRedEyeReduction whiteBalanceMode: Camera.WhiteBalanceFlash exposureCompensation: -1.0 onImageCaptured : { photoPreview.source = preview // Show the preview in an Image element }
}
@Do you know please if I have missed any other parameters?
Thank you -
Do you have right capability ?
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Yes , here is part of my .pro file
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symbian {
TARGET.CAPABILITY += NetworkServices UserEnvironment NetworkServices Location ReadUserData WriteUserData
}
@thank you
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In this example I can see the viewfinder with a black background but no camera images are displayed. However if I press the capture button then the preview image is filled with the camera's capture image. Also when taking a picture I can see the camera flash working. Any idea from this example why QML Camera element doesn't display the images when not taking a picture?
Thank you@
import QtQuick 1.0
import QtMultimediaKit 1.1Rectangle {
id: rotateCam
state: 'CameraStarted'
states: [
State {
name: "CameraStarted"
PropertyChanges { target: previewImage; z: -1 }
PropertyChanges { target: rotateCam; color: "black" }
PropertyChanges { target: takePhotoButton; buttonText: "Take Image" }
PropertyChanges { target: camera; captureResolution: Qt.size(camera.width,camera.height)}
},
State {
name: "CapturingPhoto"
PropertyChanges { target: previewImage; z: -1 }
PropertyChanges { target: rotateCam; color: "red" }
PropertyChanges { target: takePhotoButton; buttonText: "Cancel" }
},
State {
name: "ShowingPreview"
PropertyChanges { target: previewImage; z: 2 }
PropertyChanges { target: rotateCam; color: "black" }
PropertyChanges { target: takePhotoButton; buttonText: "Back" }
}
]Camera { id: camera anchors.fill: parent anchors.margins: 4 //focus : visible // to receive focus and capture key events when visible flashMode: Camera.FlashRedEyeReduction whiteBalanceMode: Camera.WhiteBalanceFlash exposureCompensation: -1.0 onImageCaptured: { console.log("Image captured!") previewImage.source = preview rotateCam.state = 'ShowingPreview' } Image { id: previewImage anchors.fill: parent fillMode: Image.PreserveAspectFit smooth: true } } CameraButton { id: exitButton anchors.right: parent.right anchors.top: parent.top anchors.margins: 60 buttonText: "Exit" onButtonPressed: Qt.quit() } CameraButton { id: takePhotoButton anchors.left: parent.left anchors.top: parent.top anchors.margins: 60 buttonText: "Take Image" onButtonPressed: { if (rotateCam.state == 'CameraStarted') { camera.captureImage() } else if (rotateCam.state == 'ShowingPreview') { rotateCam.state = 'CameraStarted' } } } MouseArea { anchors.fill: parent onClicked: { console.log("Mouse pressed!") if (rotateCam.state == 'CameraStarted') camera.searchAndLock() else if (rotateCam.state == 'ShowingPreview') rotateCam.state = 'CameraStarted' } }
}
// End of file
@
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So, I have the same issue..When I use qml camera I see only black screen (Symbian^1, Nokia 5800).
http://www.developer.nokia.com/info/sw.nokia.com/id/cc9937ed-9f1f-44b4-981f-38245bf9cae5/Qt_QCamera_Example.html
This non-qml example works perfectly on my device.mascotti, did you find a way to fix this behaviour?
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Hi,
the problem in my case was that I was using a QT's version on my device that was older then the one I was using for developing. I suggest you make sure that you are using the same QT mobility version both on the device and QT sdk.Hope this help
Maurizio -
I have the same problem on a Symbian^1 phone (Nokia X6). Here is the minimal code for a Qt Quick Application generated from the wizard. I am using Qt 1.1.2 SDK downloaded yesterday (10/07/2011), which uses Qt Mobility 1.1.3 with Qt 4.7.3. I manually installed the two Qt /QtMobility library .sis files that are the SDK start menu group.
// .pro contains following extra lines
// symbian:TARGET.CAPABILITY += UserEnvironment
// CONFIG += mobility
// MOBILITY += multimedia// main.qml contains:
import QtQuick 1.0
import QtMultimediaKit 1.1Camera {
}Result: viewfinder not appear. However the above works fine for a Symbian^3 build on Nokia N8 - viewfinder does turn on.
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Raised bug report http://bugreports.qt.nokia.com/browse/QTMOBILITY-1769
Please vote for it if you can repeat it yourself.