rem ffmpeg -i movie_1keV_T2mK_1.mp4 -filter:v fps=20 movie_1keV_T2mK_1_20fps.mp4
rem ffmpeg -i movie_lasercool9_cigar.mp4 -filter:v fps=20 movie_lasercool9_cigar_20fps.mp4
rem ffmpeg -i optmovie_bentchannel135deg_chirp-1e-2_nocompfix_2023-Jul-24.mp4 -filter:v fps=20 optmovie_bentchannel135deg_chirp-1e-2_nocompfix_2023-Jul-24_20fps.mp4
ffmpeg -i optmovie_bentchannel135deg_chirp-1e-2_nocompfix_T2mK_2023-Jul-24.mp4 -filter:v fps=20 optmovie_bentchannel135deg_chirp-1e-2_nocompfix_T2mK_2023-Jul-24_20fps.mp4