Please also verify that the remaining places where we still use _phoneOrientation are still correct.  Do you understand why we use this function for the actual photos and videos, but not for the preview streams?  Could it be that the scale(-1,1) we do on the preview stream for the front camera is unnecessary and instead we should be rotating in the opposite direction?  I guess you don't need to figure that out before landing this, but it feels like there might be followup investigation to do here.