I’ve have a video shot with a phone and for some reason the maker thought it would be a good idea to keep the phone upright while filming.
So now I’m forced to view the video with my head turned 90 degrees.
It’s uncomfortable so lets turn this video 90 degrees clockwise.

avconv -i inputvideo.mp4 -c:a copy -q 1 -r 23.967 -vf "transpose=1" outputvideo.mp4