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Instead, call the Media Playback Item object's Set Presentation Mode method, passing in the index of the track you want to toggle, and then providing a value from the Timed Metadata Track Presentation Mode enumeration.
The presentation mode you choose depends on the implementation of your app.
Setting the Selected Index property of the media playback item's Video Tracks list causes the Media Element or Media Player to switch the active video track to the specified index.
Managing media items with multiple audio tracks works exactly the same as with video tracks.
This includes the ability to access and manage multiple audio, video, and data tracks for a media item.
Add(".mkv"); //Set picker start location to the video library file Picker. Videos Library; //Retrieve file from picker Storage File file = await file Picker. = null) Using a Media Source for playback is convenient because it provides a common way to playback media from different kinds of sources, but more advanced behavior can be accessed by creating a Media Playback Item from the Media Source.
The following example shows how to play back a user-selected media file in a Media Player using Media Source. //Create a new picker var file Picker = new Windows. Source = _media Playback Item; media Player Element.
In this example, the metadata track is set to Platform Presented when enabled.
For text-based tracks, this means that the system will automatically display the text cues in the track.
A timed metadata track contains a list of cues represented by objects that inherit from IMedia Cue, such as a Data Cue or a Timed Text Cue.
Each cue has a start time and a duration that determines when the cue is activated and for how long.