Using the (C#) script here: http://wiki.unity3d.com/index.php/ScreenshotMovie
I find the captured images are inverted (upside down). A bug or a noob settings problem?
I tried to check this in 5.3.4 but the images rendered black which I gather is related to some image quality settings?
***Edit for more info. When I disable AA in the quality settings, the saved images are correctly oriented. I got the idea for trying this from a thread that discussed black images rendered on earlier versions.
So I conclude that 5.4 may be improved to allow for rendering AA screens but there may be a bug that results in an upside down image.