Motion pictures (Living images) is an exclusive feature of Nokia professional photography and allows users to take pictures at the same time, you can record a short video, but only for a few seconds, so called the "motion pictures."Then how in the Lumia730 , Lumia830 , Lumia930, Lumia Icon and Lumia1520 save as mp4 format video on it? The following methods can save the motion picture files to mp4 format video.
Make a good motion picture → enter the "album" → → Open → find the dynamic image in motion pictures in one click sharing.
Then you open the phone storage → pictures → Shared Cinemagraphs, finally you can see saved as mp4 format pictures in it.
That's it