如何使用UWP的MediaElement获取视频的总持续时间

Question

我正在使用MediaElement播放视频。现在我想在播放之前得到它的总持续时间。这怎么可能？

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Answer 1

正如@Hannes所说，如果你想通过MediaElement类的<ListView Name="DataTable" ItemsSource="{Binding Path=people}"> <ListView.View> <GridView> <GridViewColumn Width="50px"> <!-- This is column for checkboxes but it don't should be in header --> </GridViewColumn> <GridViewColumn Header="ID" DisplayMemberBinding="{Binding PersonID, UpdateSourceTrigger=PropertyChanged}"> </GridViewColumn> <GridViewColumn Header="FullName" DisplayMemberBinding="{Binding FullName, UpdateSourceTrigger=PropertyChanged}" /> <GridViewColumn Width="50px"> <!-- This is column for "Edit" buttons but it don't should be in header --> </GridViewColumn> <GridViewColumn Width="50px"> <!-- This is column for "Delete" buttons but it don't should be in header --> </GridViewColumn> </GridView> </ListView.View> </ListView> 属性获取媒体持续时间，你需要将上面的代码片段放在MediaOpened事件句柄中，例如：

NaturalDuration

实际上，您可以通过文件VideoProperties获取视频文件的持续时间。您甚至可以在打开文件之前获得持续时间。

<MediaElement x:Name="videoMediaElement" MediaOpened="videoMediaElement_MediaOpened"></MediaElement>

private void videoMediaElement_MediaOpened(object sender, RoutedEventArgs e)
{
    var totalDurationTime = videoMediaElement.NaturalDuration.TimeSpan.TotalSeconds; 
    var totalDurationTime1 = TimeSpan.FromSeconds(videoMediaElement.NaturalDuration.TimeSpan.TotalSeconds);
}

Answer 2

在xaml中使用

<TextBox x:Name="startTime" Width="20" Height="20" VerticalAlignment="Bottom" HorizontalAlignment="Right" BorderThickness="1" InputScope="Number" />

和

<TextBox x:Name="endTime" Width="20" Height="20" VerticalAlignment="Bottom" HorizontalAlignment="Right" Margin="0,0,630,135" BorderThickness="1" InputScope="Number"/>

然后在xaml.cs文件中

long x = Int64.Parse(startTime.Text);
long y = Int64.Parse(endTime.Text);


var clip = await MediaClip.CreateFromFileAsync(pickedFile);
clip.TrimTimeFromStart = new TimeSpan(x * 10000000);
clip.TrimTimeFromStart = new TimeSpan(y * 10000000);


composition = new MediaComposition();
composition.Clips.Add(clip);
mediaElement.Position = TimeSpan.Zero;
 mediaStreamSource = composition.GeneratePreviewMediaStreamSource((int)mediaElement.ActualWidth, (int)mediaElement.ActualHeight);
mediaElement.SetMediaStreamSource(mediaStreamSource);

您将使用以下代码获得总持续时间：clip.OriginalDuration.TotalSeconds