This would (maybe) help with a common thing my wife does when taking videos: Start recording in portrait mode, then realize you did that, and rotate the phone 90 degrees to get widescreen video (but without restarting the recording).
When you play it back on a phone (with auto-orientation mode on), starting from holding the phone in portrait mode (as you normally do):
* it starts playing back as portrait, which looks fine
* the video rotates (because the camera was physically rotated), so now you're watching a widescreen video that's 90 degrees off
* Your natural reaction is to flip the phone 90 degrees to make down "down" again, but this changes the phone into widescreen mode, and because it thinks it's playing a portrait-style video, it changes to portrait-in-widescreen mode, and now the video is again tilted 90 degrees but 1/3 the size with huge black bars on either side
If you play it back on a computer/TV, you get the same end result: a widescreen video that's rotated 90 degrees, and 1/3 the size with huge black bars on either side.
Can't help you with the video-taking technique but when playing back the videos, if you hold the phone so that the video matches the screen, then rotate it so the screen is upwards, you can then spin it so it looks the right way up as long as you keep the screen vertical enough.
