When LoadedBehavior attribute of MediaElement, is set to "Manual", I can see the video in the previewer, but when I run the application, the video is not displayed at all.
When LoadedBehavior is set to "Play", it works fine.
The 'Build Action' property of the video file is set to "Content". The 'Copy to output' property of the video file is set to "Copy Always".
This is the code which doesn't display the Video:
<MediaElement Source="Videos\abc.mp4" Height="300" Width="300" LoadedBehavior="Manual"/>