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rhubarbdog
Asked: 2020-08-31 02:31:25 +0800 CST

converting graphics files from webP to gif

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I have downloaded a number of video clips they are in a format called .webp. How do I convert them to .gif? A chat room I use frequently only allows .gif and .jpeg files.

I've done something like this before but it was ages ago and I can't remember what to do.

graphics gif webp

1 Answers

  1. I got this to work by modifying a script by Sean Mahan that appears to have been intended for Arch Linux I simply quoted the variables (otherwise it failed under Ubuntu 18.04.5 LTS). Here's the Ubuntu script I used. This could be further modified to include checking to insure all dependencies are installed (and optionally installing them if not).

    #!/bin/bash

DELAY="${DELAY:-10}"
LOOP="${LOOP:-0}"
r=`realpath "$1"`
d=`dirname "$r"`
pushd "$d" > /dev/null
f=`basename "$r"`
n=`webpinfo -summary "$f" | grep frames | sed -e 's/.* \([0-9]*\)$/\1/'`
dur=`webpinfo -summary "$f" | grep Duration | head -1 |  sed -e 's/.* \([0-9]*\)$/\1/'`

if (( "$dur" > 0 )); then
    DELAY = "$dur"
fi

pfx=`echo -n $f | sed -e 's/^\(.*\).webp$/\1/'`
if [ -z "$pfx" ]; then
    pfx="$f"
fi

echo "converting "$n" frames from "$f" 
working dir "$d"
file stem "$pfx""

for i in $(seq -f "%05g" 1 "$n")
do
    webpmux -get frame "$i" "$f" -o "$pfx"."$i".webp
    dwebp "$pfx"."$i".webp -o "$pfx"."$i".png
done

convert "$pfx".*.png -delay "$DELAY" -loop "$LOOP" "$pfx".gif
rm "$pfx".[0-9]*.png "$pfx".[0-9]*.webp
popd > /dev/null
exit
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