How to alter delay in a gif, without altering its speed

Question

For stupid timing reasons, I need a gif that has delay 6. Alas, my material is delay 20.

What I effectively need is to drop delay to 6, and at the same time multiply every frame three or four times. I don't mind the timing being a little off.

This seems like a simple enough problem, but utterly ungoogelable.

Answer 1

You can do it like this:

#!/bin/bash

# Split animation into constituent frames, saving as "frame-nnn.gif"
convert animated.gif -coalesce frame-%03d.gif

# Make array of all framenames
frames=( frame-*gif )

# Triplicate array elements
for ((i=0;i<${#frames[@]};i++)); do newframes+="${frames[i]} ${frames[i]} ${frames[i]} "; done

# DEBUG echo ${newframes[@]}

# Rebuild animation with new speed
convert -delay 10 ${newframes[@]} new.gif

# Clean up
rm frame-*.gif 2> /dev/null

My script assumes your original is called animated.gif and the result will be called new.gif. Obviously you can change the delays and number of duplicates as you wish, the values I have chosen are illustrative.