A Crumb for Later: ffmpeg runes to generate an animation

I found a faded post-it note from a friend who gave me the following incantation to convert a set of still images into an MPEG animation using ffmpeg. This note is a crumb for later investigation.

ffmpeg -r1 -f image2 -i <input> -vcodec mpg2video \
 -r 30000/1001 -b 25000k <outMovie.mpg>

If memory serves, the 30000/1001 may need to be changed to the decimal value, but I'll see if ffmpeg will parse and calculate on its own ;-)