Content.qml Example File

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 import QtQuick 2.0

 Rectangle {
     id: root
     border.color: "white"
     border.width: showBorder ? 1 : 0
     color: "transparent"
     property string contentType // "camera" or "video"
     property string source
     property real volume
     property bool dummy: false
     property bool autoStart: true
     property bool started: false
     property bool showFrameRate: false
     property bool showBorder: false

     signal initialized
     signal error
     signal videoFramePainted

     Loader {
         id: contentLoader
     }

     Connections {
         id: framePaintedConnection
         onFramePainted: {
             if (frameRateLoader.item)
                 frameRateLoader.item.notify()
             root.videoFramePainted()
         }
         ignoreUnknownSignals: true
     }

     Connections {
         id: errorConnection
         onFatalError: {
             console.log("[qmlvideo] Content.onFatalError")
             stop()
             root.error()
         }
         ignoreUnknownSignals: true
     }

     Loader {
         id: frameRateLoader
         source: root.showFrameRate ? "../frequencymonitor/FrequencyItem.qml" : ""
         onLoaded: {
             item.parent = root
             item.anchors.top = root.top
             item.anchors.right = root.right
             item.anchors.margins = 10
         }
     }

     onWidthChanged: {
         if (contentItem())
             contentItem().width = width
     }

     onHeightChanged: {
         if (contentItem())
             contentItem().height = height
     }

     function initialize() {
         console.log("[qmlvideo] Content.initialize: contentType " + contentType)
         if ("video" == contentType) {
             console.log("[qmlvideo] Content.initialize: loading VideoItem.qml")
             contentLoader.source = "VideoItem.qml"
             if (Loader.Error == contentLoader.status) {
                 console.log("[qmlvideo] Content.initialize: loading VideoDummy.qml")
                 contentLoader.source = "VideoDummy.qml"
                 dummy = true
             }
             contentLoader.item.volume = volume
         } else if ("camera" == contentType) {
             console.log("[qmlvideo] Content.initialize: loading CameraItem.qml")
             contentLoader.source = "CameraItem.qml"
             if (Loader.Error == contentLoader.status) {
                 console.log("[qmlvideo] Content.initialize: loading CameraDummy.qml")
                 contentLoader.source = "CameraDummy.qml"
                 dummy = true
             }
         } else {
             console.log("[qmlvideo] Content.initialize: error: invalid contentType")
         }
         if (contentLoader.item) {
             contentLoader.item.sizeChanged.connect(updateRootSize)
             contentLoader.item.parent = root
             contentLoader.item.width = root.width
             framePaintedConnection.target = contentLoader.item
             errorConnection.target = contentLoader.item
             if (root.autoStart)
                 root.start()
         }
         console.log("[qmlvideo] Content.initialize: complete")
         root.initialized()
     }

     function start() {
         console.log("[qmlvideo] Content.start")
         if (contentLoader.item) {
             if (root.contentType == "video")
                 contentLoader.item.mediaSource = root.source
             contentLoader.item.start()
             root.started = true
         }
     }

     function stop() {
         console.log("[qmlvideo] Content.stop")
         if (contentLoader.item) {
             contentLoader.item.stop()
             if (root.contentType == "video")
                 contentLoader.item.mediaSource = ""
             root.started = false
         }
     }

     function contentItem() { return contentLoader.item }
     function updateRootSize() { root.height = contentItem().height }
 }