createVideoPlayer url property not setting correctly for local file

CLI version 3.2.1, Titanium SDK version 3.2.2.GA - IOS 7.1

how to set the local file url to videoPlayer ? the url property when set takes the url from the app not from the file system

var videoPlayer = Titanium.Media.createVideoPlayer({
        top : 2,
        autoplay : true,
        backgroundColor : 'blue',
        height : 300,
        width : 300,
        mediaControlStyle : Titanium.Media.VIDEO_CONTROL_FULLSCREEN,
        scalingMode : Titanium.Media.VIDEO_SCALING_ASPECT_FIT,
        sourceType :  Titanium.Media.VIDEO_SOURCE_TYPE_FILE,
        url : "8625b0fb-340-f96d-25-bec4b07e8f4.mp4"
    });
 
Ti.API.info("videoPlayer.url : " + videoPlayer.url); 
this prints :
videoPlayer.url :
file:///Users/username/Library/Application%20Support/iPhone%20Simulator/7.1/Applications/15A55A8E-D906-4177-981E-75E94B746334/myapp.app/8625b0fb-340-f96d-25-bec4b07e8f4.mp4

i tried adding file:// to the beginning of url but then the url property is undefined