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ffmpeg -i input.mp4 -r 1 -f image2 image-%3d.jpeg

avconv (-y) -i input.mkv -ss 00:00:10 -t 00:03:26 -c:v copy -c:a copy|flac output.mkv

#!/bin/sh
find . -type f \
\( -iname "*.jpg" \
 -o -iname "*.jpeg" \) \
-exec jpeginfo -c {} \; | \
grep -E "WARNING|ERROR" | \
cut -d " " -f 1

convert -strip -interlace Plane -gaussian-blur 0.05 -quality 85% source.jpg result.jpg