FFmpeg on Polaris

NOTE: The FFmpeg module is currently missing on Polaris after a recent upgrade. A Spack build of FFmpeg will be available soon.

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.