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The code sample for this recipe plays a progressively downloaded 720p video clip. Listing 10-1 shows the XAML. Listing 10-1. XAML for a Page Playing a Media File <UserControl x:Class="Recipe10_1.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Width="400" Height="225"> <Grid x:Name="LayoutRoot" Background="White"> <MediaElement Source="http://localhost/SLBook/Ch08_RichMedia/Media/Amazon_1080.wmv" AutoPlay="True" x:Name="medElem" Opacity="0.0"/> <Border HorizontalAlignment="Stretch" VerticalAlignment="Stretch" BorderBrush="Black" BorderThickness="3"> <Border.Background> <VideoBrush SourceName="medElem" Stretch="Fill"/> </Border.Background> </Border> </Grid> </UserControl> The page has a Width of 400 and a Height of 225, providing an aspect ratio of 16:9. The Border stretches to fill the entire page, and the VideoBrush s Stretch property is set to Fill. This setup preserves the original aspect ratio of the clip. Note that in order to avoid the video being displayed twice, you set MediaElement.Opacity to 0, so that you only see the video being rendered through the VideoBrush inside the Border. Figure 10-5 shows the output.

The catalog.zul page shown in Figure 6-6 is composed of the following four parts: A menu bar on the left side A large photo of pet on the right side A pane beneath the large photo to show the detailed description of that pet A gallery of other pet images beneath the description pane

You want to develop a video player with the following features: Standard play controls like play, pause, and stop Seek features like forward and rewind Volume control A video menu Multiple playing videos such as picture-in-picture Download and play progress notifications

Build a UI that provides elements to control these features and utilize the MediaElement API to implement the necessary code for the UI function.

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The MediaElement type exposes a rich API that makes it easy to implement most of the listed features in a fairly straightforward way. Let s start by taking a look at parts of this API. We continue to cover this API across some of the other recipes later in this chapter as well.

MediaElement can acquire media through both progressive download and streaming methods. All media players have historically supported the download-and-play mechanism of playing media, where the entire media is first downloaded to the client before play can be started. However, this is cumbersome

Figure 6-6. The catalog.zul page (This pet icons on this page are from the Java Pet Store application.)

and time consuming, especially for large media files, because the user has to wait to start watching until the download has completed With the advancement of storage file-format technologies in most of the modern media file formats, including Windows Media, it is now possible for most types of media to be played almost instantaneously With this feature, called progressive download, a player starts playing the media as soon as the first few seconds of the media are downloaded, while the download continues in the background Progressive download is carried over HTTP, and any modern web server, including Microsoft Internet Information Services (IIS), can be used as a media server Streaming is another technique used to deliver media to a player Streaming does not require downloading the media file locally, and it is well suited for scenarios involving either live or on-demand broadcasts to a large population of viewers.

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