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Posted 21 Nov 2012

Getting Thumbnail from Video using MediaPlayer Class in WPF

, 21 Nov 2012
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This article shows the use of MediaPlayer class to obtain thumbnails for video files.


I once needed to create thumbnails of videos to be used in a WPF application. First, I thought of using FFMPEG to get the job done, but then changed my mind and used System.Windows.Media.MediaPlayer after doing some search on the Internet.

I owe thanks to all the people from different places on the Internet from whom I derived this version of my application. I do not remember the places from where I had taken the code snippets. But I am thankful to all of them anyway!

To make things more interesting, the sample code creates thumbnails using multi-threading. We also show a nice animation while the thumbnail creation process is in progress.

MediaElement is a bit sluggish and takes some time before the video is loaded and we have to wait a little before acquiring the thumbnail. Unfortunately, the time to wait is quite arbitrary and varies from machine to machine and invocation to invocation. So I have provided a combo-box to change the wait time if the default does not work. I have also provided another combo-box to select the position in seconds from the start of the video to specify the time when the screenshot should be taken.

Here is a screenshot of the sample application at work:

The Code

Following is a simplified version of the accompanying sample application. I have placed comments where needed. The sample application is multi-threaded and uses just a little more elaborate code. Please see the sample code for more details.

void ImportMedia(string mediaFile, int waitTime, int position)
    MediaPlayer player = new MediaPlayer { Volume = 0, ScrubbingEnabled = true };
    player.Open(new Uri(mediaFile));
    player.Position = TimeSpan.FromSeconds(position);
    //We need to give MediaPlayer some time to load. 
    //The efficiency of the MediaPlayer depends                 
    //upon the capabilities of the machine it is running on and 
    //would be different from time to time
    System.Threading.Thread.Sleep(waitTime * 1000);

    //120 = thumbnail width, 90 = thumbnail height and 96x96 = horizontal x vertical DPI
    //In an real application, you would not probably use hard coded values!
    RenderTargetBitmap rtb = new RenderTargetBitmap(120, 90, 96, 96, PixelFormats.Pbgra32);
    DrawingVisual dv = new DrawingVisual();
    using (DrawingContext dc = dv.RenderOpen())
        dc.DrawVideo(player, new Rect(0, 0, 120, 90));
    Duration duration = player.NaturalDuration;
    int videoLength = 0;
    if (duration.HasTimeSpan)
        videoLength = (int)duration.TimeSpan.TotalSeconds;
    BitmapFrame frame = BitmapFrame.Create(rtb).GetCurrentValueAsFrozen() as BitmapFrame;
    BitmapEncoder encoder = new JpegBitmapEncoder();
    encoder.Frames.Add(frame as BitmapFrame);
    MemoryStream memoryStream = new MemoryStream();
    //Here we have the thumbnail in the MemoryStream!


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Technical Lead
Pakistan Pakistan
I am a full-stack developer. My skills include JavaScript, C#/.Net, MS Azure cloud etc. I love to work on complex programming tasks requiring deep analysis, planning and use of efficient algorithms and data structures.

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