How can I convert large jpgs (15000 x 10840px) to video?
That's way more than h.264 can handle. The maximum resolution for h.264 is 4096×2304 with Level 5.1 or 5.2.
http://en.wikipedia.org/wiki/H.264#Levels

There are lossless codecs who can theoretically handle this video resolution but it would make no sense to do this. There is no hardware capable of playing videos in this resolution at any acceptable frame rate.
Atleast none that is in any way affordable by a normal human being.