BitmapEncoder MemoryLeak with SoftwareBitmap

Question

I use the BitmapEncoder class for converting a captured videoframe of a camera to a Stream. When doing this in a loop using a DispatcherTimer my application gradually leaks memory but never recovers any of it.

I used this Microsoft sample as base.

The actual code that leaks.

var previewProperties = _mediaCapture.VideoDeviceController.GetMediaStreamProperties(MediaStreamType.VideoPreview) as VideoEncodingProperties;
using (var videoFrame = new VideoFrame(BitmapPixelFormat.Rgba16, (int)previewProperties.Width, (int)previewProperties.Height))
{
    using (InMemoryRandomAccessStream stream = new InMemoryRandomAccessStream())
    {
        using (var currentFrame = await _mediaCapture.GetPreviewFrameAsync(videoFrame))
        {
            // Collect the resulting frame
            using (SoftwareBitmap previewFrame = currentFrame.SoftwareBitmap)
            {

                BitmapEncoder encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.JpegEncoderId, stream);
                //MEMORY LEAK
                encoder.SetSoftwareBitmap(previewFrame);
                await encoder.FlushAsync();

                //DO something with the stream
            }
        }
    }
}

Answer 1

After searching harder and browsing through the MSDN forums I found a MSDN thread with exact the same issue. It's a bug in Visual Studio and does only affect apps while debugging them.