Question

I am trying create a WCF service that leverages the WPF MediaPlayer on the server to generate thumbnails for a video that a user uploads. I found a lot oif info on how to render a frame and save it to a file. But the problem is the key event MediaOpened (actually none of the events) I need to tie into doesn’t – EDIT fire.

Does anyone know if the WPF MediaPlayer events do not fire if used ion the context of a WCF service?

thanks Michael

Answer 1

I decided to try and use the Expression Media Encoder 2 SDK and it worked great.

Very little code to generate thumbnails from a video – here is a snippet

public void GenerateThumbnails(string fileName, int numberOfThumbnails) 

{ Queue _positionsToThumbnail = new Queue(); Microsoft.Expression.Encoder.MediaItem video = new Microsoft.Expression.Encoder.MediaItem(fileName);

var totalMilliseconds = video.FileDuration.TotalMilliseconds;  //create a queue of timespans for the thumbnails for (int i = 0; i < numberOfThumbnails; i++) {     _positionsToThumbnail.Enqueue(TimeSpan.FromMilliseconds((((2 * i) + 1) * totalMilliseconds) / (2 * numberOfThumbnails))); }  //create the thumbnails and save them to disk while(_positionsToThumbnail.Count > 0) {      Bitmap bitMap = video.GetThumbnail(_positionsToThumbnail.Dequeue(), new System.Drawing.Size(100,100));     bitMap.Save(@'F:\thumbs\' + _positionsToThumbnail.Count.ToString() + '.png', ImageFormat.Png); } 

}