I'm on F22. I recently used Shotwell to bring a bunch of photos and videos in from my Android phone.
I shot one of the videos in portrait mode. Shotwell brought it in rotated 90 degrees, and wouldn't rotate it back--the "Rotate" option seems to be available only for still images, not videos. I can find discussion online regarding this fact--that Shotwell doesn't offer manual video rotation--but nothing about the initial rotation upon import.
I was able to use mencoder to rotate it back, but with some loss of quality it seems.