Some of us like to post webpages or ebay auctions with high quality pictures, represented by thumbnails on the index page, to save bandwidth of viewers who may or may not be interested in large, slow to download images.
Some of us also like to make short videos of things.
Thumbnails of images can be made easily with ImageMagick.
I wrote a simple shell script to make "thumbnails" of video movies, by means of creating animated gifs.
Example of such page with "movie thumbnail" is here:
This script requires mplayer, transcode and ImageMagick, all standard components of Linux distributions.
====================================================================== #!/bin/sh
VIDEO=$1 GIF=$2
transcode -o ./-xxxx -x mplayer -y jpg -i $VIDEO --frame_interval 24 -c 1-241 convert -geometry 20\%x20\% ./-xxxx*.jpg $GIF rm ./-xxxx*