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The purpose (intent) wouldn’t be explained, but it could be useful for tools which have oddball syntax and are only used sometimes (infrequent enough for you to forget).

> I found a modified a ffmpeg shell script no later than yesterday that finds all my movies files and generates one jpeg with 16 "tiles" thumbnails for each movie

I wrote a script called dovid I left on Pastebin that creates contact sheets (what you are describing) for every video file of any popular format in the directory executed and then combines them into a webpage or pdf. But it isn't an exceptional script because it just utilizes vcs[1] and convert (ImageMagick). At some point, I stopped using the script and just aliased this command (arbitrarily as 'peak') in my ~/.bash_profile

     alias peak='for i in *.mkv *.mpg *.wmv *.avi *.mov *.m4v *.mp4; do echo "$i"; /opt/local/bin/vcs -q -q -j -dt -ds -dp -u "0" -n 16 -c 4 -H 162 "$i"; done; echo ".......... converting jpgs to a pdf"; /opt/local/bin/convert *.jpg index.pdf; /bin/rm *.jpg'

Creates a pdf of contact sheets 4x4@162dpi, much neater than a directory filled with as many jpegs as videos. Obviously, this is dangerous and destructive if there are other jpeg files in that directory.

[1] http://p.outlyer.net/vcs (ffmpeg is a dependency)

Would you be willing to share that script, or the one you modified to make it?

Fish has it? Which one is it? I use fish but I didn't know that.