Trimming

To trim a file, you use TrimStartTime and TrimStopTime properties exposed by MediaTranscoder. The following code demonstrates:

Click here to view code image

async Task TrimUserSelectedFile() {   // Get a source MP4 file from the user   FileOpenPicker openPicker = new FileOpenPicker();   openPicker.FileTypeFilter.Add(".mp4"); #if WINDOWS_PHONE_APP   // See Chapter 19   ... #else   StorageFile sourceFile = await openPicker.PickSingleFileAsync();   if (sourceFile != null)   {     // Get a target MP4 file from the user     FileSavePicker savePicker = new FileSavePicker();     savePicker.FileTypeChoices.Add("MP4 file", new string[] { ".mp4" });     StorageFile targetFile = await savePicker.PickSaveFileAsync();     if (targetFile != null

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