Lumia 920 since the launch of the official claim that it is
to have Rich Recording technology, but compared to the Nokia 808 PureView
two-channel stereo recording, Lumia 920's Rich Recording technology can only
achieve a single-channel recording, of course, the reason why there is such
difference obtained because Windows Phone 8 system limitations caused obtained.
But to get Amber update, Lumia 920 users can be achieved Pro
Camera app video channel stereo recording. But I believe this change is
necessary to carefully compare perceived.