Why is a Y in the Windows Phone Mango Camera API

The new Windows Phone Mango tools will contain the Webcam CaptureSource and VideoSink API from Silverlight 4. Additionally it also introduce the new FileSink class which can be used to record the video stream as MP4 to the Isolated Storage. Most important a new PhotoCamera class with a lot of functionality is present in Mango. This blog post tries to fill the gaps and provides some information especially about the PhotoCamera's YCrCb capture methods.