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POHow do you capture current frame from a MediaElement in WinRT (8.1)?
 

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  1. POHow do you capture current frame from a MediaElement in WinRT (8.1)?
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    <p>I am trying to implement a screenshot functionality in a WinRT app that shows Video via a MediaElement. I have the following code, it saves a screenshot that's the size of the MediaElement but the image is empty (completely black). Tried with various types of Media files. If I do a Win Key + Vol Down on Surface RT, the screen shot includes the Media frame content, but if I use the following code, it's blackness all around :(</p> <pre><code>private async Task SaveCurrentFrame() { RenderTargetBitmap renderTargetBitmap = new RenderTargetBitmap(); await renderTargetBitmap.RenderAsync(Player); var pixelBuffer = await renderTargetBitmap.GetPixelsAsync(); MultimediaItem currentItem = (MultimediaItem)this.DefaultViewModel["Group"]; StorageFolder currentFolder = Windows.Storage.ApplicationData.Current.LocalFolder; var saveFile = await currentFolder.CreateFileAsync(currentItem.UniqueId + ".png", CreationCollisionOption.ReplaceExisting); if (saveFile == null) return; // Encode the image to the selected file on disk using (var fileStream = await saveFile.OpenAsync(FileAccessMode.ReadWrite)) { var encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.PngEncoderId, fileStream); encoder.SetPixelData( BitmapPixelFormat.Bgra8, BitmapAlphaMode.Ignore, (uint)renderTargetBitmap.PixelWidth, (uint)renderTargetBitmap.PixelHeight, DisplayInformation.GetForCurrentView().LogicalDpi, DisplayInformation.GetForCurrentView().LogicalDpi, pixelBuffer.ToArray()); await encoder.FlushAsync(); } } </code></pre> <p>Here MultimediaItem is my View Model class that among other things has a UniqueId property that's a string.</p> <p>'Player' is the name of the Media Element.</p> <p>Is there anything wrong with the code or this approach is wrong and I've to get in the trenches with C++?</p> <p>P.S. I am interested in the WinRT API only.</p> <p><strong>Update 1</strong> Looks like RenderTargetBitmap doesn't support this, the MSDN documentation clarifies it <a href="http://msdn.microsoft.com/en-us/library/windows/apps/windows.ui.xaml.media.imaging.rendertargetbitmap" rel="nofollow">http://msdn.microsoft.com/en-us/library/windows/apps/windows.ui.xaml.media.imaging.rendertargetbitmap</a> . I'll appreciate any pointers on how to do it using DirectX C++. This is a major task for me so I'll crack this one way or the other and report back with the solution.</p>
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    1. USsumitkm
    1. USsumitkm
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      1. POHow do you capture current frame from a MediaElement in WinRT (8.1)?
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      1. POHow do you capture current frame from a MediaElement in WinRT (8.1)?
      1. USChris Leyva
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      1. POHow do you capture current frame from a MediaElement in WinRT (8.1)?
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    1. COI'm not sure that you can Render to bitmap a MediaElement. Have you tried your code on some other type of element? See this as well: http://stackoverflow.com/questions/17971111/rendering-not-working-with-mediaelement-windows-rt
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      1. POHow do you capture current frame from a MediaElement in WinRT (8.1)?
      1. USWiredPrairie
    2. COYup, looks like this is not possible at the moment. Keeping it open for some pointers on a C++ Solution while I work on it as well.
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      1. POHow do you capture current frame from a MediaElement in WinRT (8.1)?
      1. USsumitkm
    3. COYou'll probably want to use Media Foundation with that. DirectX might also make sense, used together with MF. I can't find the interfaces to use with that right now though.
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      1. POHow do you capture current frame from a MediaElement in WinRT (8.1)?
      1. USFilip Skakun
 

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