MediaElement in MainPage.xml

mainpage.xml

<Page
    x:Class="SmoothStreamingWP81.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:SmoothStreamingWP81"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">

    <Grid>
        <MediaElement x:Name="Player"
                      HorizontalAlignment="Center" 
                      VerticalAlignment="Center"/>
    </Grid>
</Page>