Lossless rotation of MJPEG video

Write out the JPEG frames:

avconv -i WHOOPS.AVI -c:v copy -bsf:v mjpeg2jpeg frame_%d.jpg


Rotate them losslessly:

exiftran -i -2 frame*.jpg


Reassemble the frames and grab the audio from the original file to create a new complete file:

avconv -framerate 29.97 -i frame_%d.jpg -i WHOOPS.AVI -codec copy /
   -map 0:v -map 1:a ROTATED.AVI