Windows Phone 8.1 MediaCapture CapturePhotoToStorageFileAsync memory leak - camera

Question

I am building a universal app for timelapse that captures a sequence of photos at a specified interval. In my timer tick event, I am capturing an image and saving it to a storage file like this:
StorageFile file = await appFolder.CreateFileAsync(IMAGE_FILE_ROOT, Windows.Storage.CreationCollisionOption.GenerateUniqueName);
ImageEncodingProperties imageProperties = ImageEncodingProperties.CreateJpeg();
await MediaCaptureManager.CapturePhotoToStorageFileAsync(imageProperties, file);
ImageFilePaths.Add(file.Path);
file = null;
After successfully capturing around 30 images at the highest resolution (140 on low res) on my phone, I get an Out of Memory exception on the CapturePhotoToStorageFileAsync method.
I tried just taking the photo to an InMemoryRandomAccessStream so that I could elliminate the StorageFile API for the leak, and it still leaks.
I profiled the memory utilization with the WinPhone Power Tools and it is a constant rise while photos are being taken.
Is there anything I can do to work around this?
Update:
Here is test code that demonstrates the leak:
for (int x = 0; x < 40; x++)
{
using (IRandomAccessStream memoryStream = new InMemoryRandomAccessStream())
{
await MediaCaptureManager.CapturePhotoToStreamAsync(imageProperties, memoryStream);
}
await Task.Delay(1000);
}

Answer 1

So I figured out how to work around the issue!
Apparently the memory leak has something to do with the audio driver. If you initialize the MediaCaptureManager like this, the leak disappears.
var mediaSettings = new MediaCaptureInitializationSettings
{
PhotoCaptureSource = PhotoCaptureSource.Auto,
StreamingCaptureMode = StreamingCaptureMode.Video,
AudioDeviceId = string.Empty
};