They should just put a gravity vector in the image.
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.
And uptime seconds (!?)
And estimated distance to subject, AGPS information, GPS acquisition time, depth field metadata, current battery level, operating system version, ...