1 frame per second would be -r 1, one frame every four seconds would be -r 0.25, one frame every ten seconds would be -r 0.1 and so on. The trick is to simply change the frame rate of the output to whatever we want using the -r n option where n is the number of frames per second. Ok so now we know how to export the movie as a sequence of images, but say we don't want to export every single frame? You can use lots of still image formats, png, jpeg, tga, whatever (see ffmpeg -formats for a full list).
The %0xd bit is converted to a zero-padded integer x digits long - the example I gave gets output as To export as an image sequence just use myimage_%04d.png or similar as the output. It's very simple with ffmpeg, and it can output one frame every N seconds without extra scripting.
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