Hi,I've got a problem while using "Titanium.Media.showCamera"
here's the code:

Titanium.Media.showCamera({
    success: function(event){
        var video = event.media;
        movieFile = Titanium.Filesystem.getFile(Titanium.Filesystem.applicationDataDirectory,'mymovie.mov');
        movieFile.write(video);
    },
    cancel:function(){
    },
    error:function(error){
        // create alert
        var a = Titanium.UI.createAlertDialog({title:'Video'});

        // set message
        if (error.code == Titanium.Media.NO_VIDEO){
            a.setMessage('Device does not have video recording capabilities');
        }
        else{
            a.setMessage('Unexpected error: ' + error.code);
        }
        a.show();
    },
    mediaTypes: Titanium.Media.MEDIA_TYPE_VIDEO,
    videoMaximumDuration:10000,
    videoQuality:Titanium.Media.QUALITY_HIGH
});

I can still using my camera to take Picture but no Video,and the "mediaTypes" has been set to "Titanium.Media.MEDIA_TYPE_VIDEO"

why and what can i do to take video?