Difference between Qt Quick Application and Qt Quick UI?

[houmingc]

what is the difference between Qt Quick Application and Qt Quick UI?

I tried running below code in this two different projects?
Qt Quick UI is able to play the movie media but not Qt Quick Application.
Can someone explains why and where the mistake make?

import QtQuick 2.0
import QtMultimedia 5.0

Rectangle {
width: 480
height: 270

MediaPlayer {
    id: player
    source: "trailer_1080p.mov" // Point this to a suitable video file
    autoPlay: true
}

VideoOutput {
    source: player
    anchors.fill: parent
}

}