protected override MediaTransformResult TransformStream(Stream stream, out Stream transformedStream)
{
var bitmap = BitmapFrame.Create(stream);
var exifData = _exifParser.Parse(bitmap);
transformedStream = new MemoryStream();
Serialize(transformedStream, exifData);
transformedStream.Seek(0, SeekOrigin.Begin);
return MediaTransformResult.Success;
}