Using ffmpeg we can quickly composite stills into a movie.

ffmpeg -f image2 -r 25 -i ./%d.jpg -b 1000k outfile.mp4

Where

-f is the input format. Always image2 when we are sequencing.
-r is the frame rate. PAL video is 25fps. 
-i are the input files.
The %d means sequentially numeric. This inputs files ending in jpg
-b bitrate and lastly the outfile which determines the format.

Via web.mit.edu/robyn/www/ffmpeghowto.html