FFmpeg on Polaris

To use FFmpeg on Polaris first load the corresponding module:

module load ffmpeg

This is a typical command line to create a movie from a series of snapshots in PNG format:

ffmpeg -r 15 -i frames.%03d.png -r 25 -pix_fmt yuv420p movie.mp4

where:

-r 15 is the input frame rate. Experiment with values smaller than the output frame rate for longer movies.
-r 25 is the output frame rate (use this value for standard 25 frames per second)
-i frames.%03d.png reads the input frames in sequence
-pix_fmt yuv420p is needed for movies to play in browsers
movie.mp4 is the resulting movie