Making a nice contact sheet of a movie is not too hard, this is a great way to show off interesting scenes in a film. This is using a very nice one-liner.
Bash
ffmpeg -hide_banner -v 32 -stats -y -i mymovie.mkv -vf "drawtext=timecode='00\:00\:00\:00':r=25:x=(w-tw)/2: y=(2*lh):fontsize=64:fontcolor=black:box=1:boxcolor=0xFFFFFFFF@1,scale=iw/4:-4:out_range=full:sws_flags=spline:sws_dither=0,select='gt(scene\,0.25)',tile=2x2" -vsync 0 preview_%03d.pngCreating a set of nice 4×4 images with good-quality screenshots of the key scenes in the film.
Below is what you get, a lot of images that are 4×4 contact sheets of the movie.
This version will create nice 8×8 contact sheets, this looks very good as well.
Bash
ffmpeg -hide_banner -v 32 -stats -y -i Oppenheimer.2023.1080p.Bluray.REMUX.AVC.DTS-HD.MA.5.1-GHD.mkv -vf "drawtext=timecode='00\:00\:00\:00':r=25:x=(w-tw)/2: y=(2*lh):fontsize=64:fontcolor=black:box=1:boxcolor=0xFFFFFFFF@1,scale=iw/4:-4:out_range=full:sws_flags=spline:sws_dither=0,select='gt(scene\,0.25)',tile=8x8" -vsync 0 preview_%03d.pngThis does put the timestamp at the top of each screenshot as well. This is a very good solution for this task.