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Regnerate Exif thumbnail.
The input images are assume to have the "JPG" extension. Mogrify will overwrite any gif images with the same name! Will not work with names with spaces.
thumbnail gallery of video using totem
Faster thumbnail creation than '-itsoffset'
ffmpeg -itsoffset -4 -i test.avi -vcodec mjpeg -vframes 1 -an -f rawvideo -s 320x240 test.jpg
An alternative which uses the advanced zsh globbing (pattern matching)
By time thumbnail images in ~/thumbnails take up too much space, this command will help deleting old ones.
Find options explained:
-type f : find files only, not directories
-atime +30 : last accessed more than 30 days ago