--- old post above --- --- new post below --- Now you can see for yourself.
To photograph it in portrait I hold the camera vertically. Maybe I should stop doing that? Mighty miffing.
The answer to your question is probably yes - stop doing it! Think about this, as far as I am aware all video / television / movie film camera's are filmed in horizontal format, i.e. rectangular horizontal box format. if they need to get closer to an object or whatever, they just zoom in, so therefore a facility to rotate a film clip is not necessary (normally) unless you want the film clip upside down, then you turn the video camera upside down. Hopefully, you get the point I'm attempting to make but I think there may not be a readily software available to do what you want from the usual sources - it is not common.