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Media editing sample

This sample shows how to use the APIs in the Windows.Media.Editing namespace to edit and compose media clips. The tasks demonstrated in these scenarios include opening, trimming, and saving videos, appending multiple video clips together into a single composition, adding background audio, and using overlays to composite videos.

Scenario 1: Trim and Save Clip:
Press the Choose Video button to launch a file open picker that allows you to choose a video file to open. Press the Trim Video button to trim 25% of the videos duration from the beginning and end of the clip . Press play on the video controls to view the trimmed video clip. Press the Save Result button to launch a file save picker that allows you to choose a location and file name with which to save the trimmed video clip.

In the code behind, when the file open picker is launched and a file is selected, the file is assigned to a MediaElement defined in the XAML file with a call to using the SetSource to make it viewable in the UI.

When the Trim Video button is pressed, a new MediaClip object is created from the video file with a call to MediaClip.CreateFromFileAsync. The TrimTimeFromStart and TrimTimeFromEnd methods of the MediaClip class are called to trim the duration of the clip. Next, a new MediaComposition object is created and the trimmed clip is appended to the composition's Clips collection. A MediaStreamSource is created using the MediaComposition method GeneratePreviewMediaStreamSource and then the *MediaElement method SetMediaStreamSource to make the composition viewable in the UI.

When the Save Result button is pressed, a FileSavePicker is created to allow the user to pick a destination file. The MediaComposition method RenderToFileAsync saves the composition to the selected file.

Scenario 2: Append Clips:
Press the Choose First Video button to launch a file open picker that allows you to choose a video file to open. Press the Choose Second Video button to select a second video. Press the Append Videos button to append the videos together into a single composition. Press play on the video controls to view the trimmed appended clips.

In the code behind, when each file picker is launched, the resulting file is assigned to the MediaElement defined in the XAML file with the SetSource method, to make the video files viewable in the UI. When the Append Videos button is pressed, a new MediaClip object is created for each of the video files. Next, a new MediaComposition object is created and each media clip is added to the composition's Clips collection. Finally, a MediaStreamSource is created using the MediaComposition method GeneratePreviewMediaStreamSource and then the MediaElement method SetMediaStreamSource is called to make the composition is viewable in the UI.

Scenario 3: Add Audio Tracks
Press the Choose Video button to launch a file open picker that allows you to choose a video file to open. Press the Add Background Audio button to launch a file open picker that allows you to choose a audio file to open. Press play on the video controls to view the video clip with the added background audio.

In the code behind, when the file open picker is launched and a video file is selected, the file is assigned to a MediaElement defined in the XAML file with a call to using the SetSource. When the Add Background Audio button is pressed, a new MediaClip is created from the selected video file, a new MediaComposition is created, and the MediaClip is added to the composition's Clips collection. Next the file picker for the audio file is launched. When the file picker returns, a new BackgroundAudioTrack is created from the selected audio file by calling CreateFromFileAsync. The BackgroundAudioTrack is added to the composition's BackgroundAudioTracks collection. Finally, a MediaStreamSource is created using the MediaComposition method GeneratePreviewMediaStreamSource and then the MediaElement method SetMediaStreamSource is called to make the composition viewable in the UI.

Scenario 4: Add Overlays Press the Choose Base Video button to launch a file open picker that allows you to choose a video file to open. Press the Choose Overlay Video button to select a second video. Press play on the video controls to view the overlayed video clip.

In the code behind, when each file picker is launched, the resulting file is assigned to the MediaElement defined in the XAML file with the SetSource method, to make the clips viewable in the UI. To create the overlay, first a new MediaClip is created from the base video clip, a new MediaComposition is created, and the base media clip is added to the composition's Clips collection. Next, a new MediaClip is created for the overlay video clip. The GetVideoEncodingProperties method is called to get information about the format of the clip. A Rect to specify the placement of the overlay is created, using the encoding properties to make sure the aspect ratio of the clip is preserved. Next, a MediaOverlay object is created from the clip. The Position of the overlay is set using the Rect structure and the Opacity of the overlay is set to 75%. A new OverlayLayer is created, and the MediaOverlay is added to its Overlays collection. Next the OverlayLayer is added to the composition's OverlayLayers collection. Finally, a MediaStreamSource is created using the MediaComposition method GeneratePreviewMediaStreamSource and then the MediaElement method SetMediaStreamSource is called to make the composition viewable in the UI.

Related topics

Windows.Media.Editing namespace

System requirements

Client: Windows 10

Phone: Windows 10

Build the sample

  1. If you download the samples ZIP, be sure to unzip the entire archive, not just the folder with the sample you want to build.
  2. Start Microsoft Visual Studio 2015 and select File > Open > Project/Solution.
  3. Starting in the folder where you unzipped the samples, go to the Samples subfolder, then the subfolder for this specific sample, then the subfolder for your preferred language (C++, C#, or JavaScript). Double-click the Visual Studio 2015 Solution (.sln) file.
  4. Press Ctrl+Shift+B, or select Build > Build Solution.

Run the sample

The next steps depend on whether you just want to deploy the sample or you want to both deploy and run it.

Deploying the sample

  1. Select Build > Deploy Solution.

Deploying and running the sample

  1. To debug the sample and then run it, press F5 or select Debug > Start Debugging. To run the sample without debugging, press Ctrl+F5 or selectDebug > Start Without Debugging.