Add ken burn effect on video from list of images - ruby-on-rails

Question

I have created video from list of images using ffmpeg
system("ffmpeg -framerate 1 -pattern_type glob -i '*.jpg' -c:v libx264 out.mp4")
Now i want to add Ken burn effect, can i do it with ffmpeg or imagemagic or any command line tool on linux.

Answer 1

I can't speak of ruby-on-rails, linux, or ffmpeg technologies. But if you would like to create a panning effect made popular by Ken Burn, you would extract regions of an image, and animate them together.
#!/bin/bash
# A 16:10 ratio
WIDTH=64
HEIGHT=40
# Extract parts of an image with -extent operator
for index in $(seq 40)
do
TOP=$(expr 120 + $index)
LEFT=$(expr 150 + $index)
FILENAME=$(printf /tmp/wizard-%02d.jpg $index)
convert wizard: -extent "${WIDTH}x${HEIGHT}+${TOP}+${LEFT}" $FILENAME
done
# Replace this with your ffmpeg script
SLICES=$(ls /tmp/wizard-*.jpg)
RSLCES=$(ls /tmp/wizard-*.jpg | sort -rn)
convert $SLICES $RSLCES -set delay 15 -layers Optimize /tmp/movie.gif
Edited by Mark Setchell beyond this point... (just trying to help out)
Much as I hate editing other people's posts, the first part of Eric's code can equally be written this way if you find that easier to understand:
# Extract parts of an image with -extent operator
for index in {1..40}
do
((TOP=120 + $index))
((LEFT=150 + $index))
FILENAME=$(printf /tmp/wizard-%02d.jpg $index)
convert wizard: -extent "${WIDTH}x${HEIGHT}+${TOP}+${LEFT}" $FILENAME
done