protected override async void OnNavigatedTo(NavigationEventArgs e)
{
var videoFile = e.Parameter as StorageFile;
if (videoFile != null)
{
StatusTextBlock.Text = videoFile.DisplayName;
// Create a MediaClip from the file
var clip = await MediaClip.CreateFromFileAsync(videoFile);
// Set the End Trim slider's maximum value so that the user can trim from the end
// You can also do this from the start
EndTrimSlider.Maximum = clip.OriginalDuration.TotalMilliseconds;
// Create a MediaComposition containing the clip and set it on the MediaElement.
composition = new MediaComposition();
composition.Clips.Add(clip);
// start the MediaElement at the beginning
EditorMediaElement.Position = TimeSpan.Zero;
// Create the media source and assign it to the media player
mediaStreamSource = composition.GeneratePreviewMediaStreamSource((int)EditorMediaElement.ActualWidth, (int)EditorMediaElement.ActualHeight);
// Set the MediaElement's source
EditorMediaElement.SetMediaStreamSource(mediaStreamSource);
TrimClipButton.IsEnabled = true;
}
}
private void TrimClip_Click(object sender, RoutedEventArgs e)
{
// Get the first clip in the MediaComposition
// We know this beforehand because it's the only clip in the composition
// that we created from the passed video file
MediaClip clip = composition.Clips.FirstOrDefault();
// Trim the end of the clip (you can use TrimTimeFromStart to trim from the beginning)
clip.TrimTimeFromEnd = TimeSpan.FromMilliseconds((long)EndTrimSlider.Value);
// Rewind the MediaElement
EditorMediaElement.Position = TimeSpan.Zero;
// Update the video source with the trimmed clip
mediaStreamSource = composition.GeneratePreviewMediaStreamSource((int)EditorMediaElement.ActualWidth, (int)EditorMediaElement.ActualHeight);
// Set the MediaElement's source
EditorMediaElement.SetMediaStreamSource(mediaStreamSource);
// Update the UI
EndTrimSlider.Value = 0;
StatusTextBlock.Text = "Clip trimmed! Trim again or click Save.";
StatusTextBlock.Foreground = new SolidColorBrush(Colors.LawnGreen);
SaveButton.IsEnabled = true;
}
private void TrimClip_Click(object sender, RoutedEventArgs e)
{
try
{
// Show the overlay that contains the ProgressBar
BusyOverlay.Visibility = Visibility.Visible;
EncodingProgressTextBlock.Text = "trimming...";
// Get the first clip in the MediaComposition
// We know this beforehand because it's the only clip in the composition
// that we created from the passed video file
MediaClip clip = composition.Clips.FirstOrDefault();
// Trim the end of the clip (you can use TrimTimeFromStart to trim from the beginning)
clip.TrimTimeFromEnd = TimeSpan.FromMilliseconds((long)EndTrimSlider.Value);
// Rewind the MediaElement
EditorMediaElement.Position = TimeSpan.Zero;
// Update the video source with the trimmed clip
mediaStreamSource = composition.GeneratePreviewMediaStreamSource((int)EditorMediaElement.ActualWidth, (int)EditorMediaElement.ActualHeight);
// Set the MediaElement's source
EditorMediaElement.SetMediaStreamSource(mediaStreamSource);
// Update the UI
EndTrimSlider.Value = 0;
StatusTextBlock.Text = "Trim Successful! Trim again or click the SAVE button to keep.";
StatusTextBlock.Foreground = new SolidColorBrush(Colors.Green);
SaveButton.IsEnabled = true;
}
catch (Exception exception)
{
Debug.WriteLine(exception);
throw;
}
finally
{
BusyOverlay.Visibility = Visibility.Collapsed;
EncodingProgressTextBlock.Text = "";
}
}
