MediaElement.SpeedRatio Property

Gets or sets the speed ratio of the media.

Namespace:  System.Windows.Controls
Assembly:  PresentationFramework (in PresentationFramework.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation

member SpeedRatio : float with get, set
<object SpeedRatio="double" .../>

Property Value

Type: System.Double
The speed ratio of the media. The valid range is between 0 (zero) and infinity. Values less than 1 yield slower than normal playback, and values greater than 1 yield faster than normal playback. Negative values are treated as 0. The default value is 1.

ExceptionCondition
InvalidOperationException

The Clock property is not a null reference (Nothing in Visual Basic).

This property can be set only when the Clock property is a null reference (Nothing in Visual Basic). When the Clock property is non-a null reference (Nothing in Visual Basic), the timing engine controls media playback behavior.

Audio playback may not occur unless the value of SpeedRatio is 1.

The following example shows how to control playback of media using a MediaElement. The example creates a simple media player that allows you to play, pause, stop, and skip back and forth in the media as well as adjust the volume and speed ratio.

The code below creates the UI.

NoteNote

The LoadedBehavior property of MediaElement must be set to Manual in order to be able to interactively stop, pause, and play the media.

<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  x:Class="SDKSample.MediaElementExample" >

  <StackPanel Background="Black">

    <!-- To interactively stop, pause, and play the media, the LoadedBehavior 
           property of the MediaElement must be set to "Manual". -->
    <MediaElement Source="media\numbers.wmv" Name="myMediaElement" 
     Width="450" Height="250" LoadedBehavior="Manual" UnloadedBehavior="Stop" Stretch="Fill" 
     MediaOpened="Element_MediaOpened" MediaEnded="Element_MediaEnded"/>

    <StackPanel HorizontalAlignment="Center" Width="450" Orientation="Horizontal">

      <!-- Play button. -->
      <Image Source="images\UI_play.gif" MouseDown="OnMouseDownPlayMedia" Margin="5" />

      <!-- Pause button. -->
      <Image Source="images\UI_pause.gif" MouseDown="OnMouseDownPauseMedia" Margin="5" />

      <!-- Stop button. -->
      <Image Source="images\UI_stop.gif" MouseDown="OnMouseDownStopMedia" Margin="5" />

      <!-- Volume slider. This slider allows a Volume range between 0 and 1. -->
      <TextBlock Foreground="White" VerticalAlignment="Center" Margin="5"  >Volume</TextBlock>
      <Slider Name="volumeSlider" VerticalAlignment="Center" ValueChanged="ChangeMediaVolume" 
       Minimum="0" Maximum="1" Value="0.5" Width="70"/>

      <!-- Volume slider. This slider allows you to change the speed of the media playback. -->
      <TextBlock Foreground="White" Margin="5"  VerticalAlignment="Center">Speed</TextBlock>
      <Slider Name="speedRatioSlider" VerticalAlignment="Center" ValueChanged="ChangeMediaSpeedRatio" 
       Value="1" Width="70" />

      <!-- Seek to slider. Ths slider allows you to jump to different parts of the media playback. -->
      <TextBlock Foreground="White" Margin="5"  VerticalAlignment="Center">Seek To</TextBlock>
      <Slider Name="timelineSlider" Margin="5" ValueChanged="SeekToMediaPosition" Width="70"/>

    </StackPanel>
  </StackPanel>
</Page>

The code below implements the functionality of the sample UI controls. The Play, Pause, and Stop methods are used to respectively play, pause and stop the media. Changing the Position property of the MediaElement allows you to skip around in the media. Finally, the Volume and SpeedRatio properties are used to adjust the volume and playback speed of the media.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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