Script that takes a gif and attempts to make a crossview 3D gif by duplicating sbs and delaying the right half by two frames.

3dify.sh

#!/bin/bash
FRAME="frame.gif"
INFILE=$1
OUTFILE=$2
MOVEBY=2
NUMFRAMES=`gifsicle -I $INFILE |
    perl -ne 'if(/(\d+) images/) { print $1;}'`
echo "Cleaning up any previous runs..."
rm -rf left
rm -rf right
rm -rf sbs
mkdir left
echo "Extracting $NUMFRAMES frames..."
gifsicle -e $INFILE -o left/$FRAME
cp -r left right
 
for i in `seq -w $(($NUMFRAMES-1)) -1 0`
do
    echo "mv right/${FRAME}.$i right/${FRAME}.`echo \"$i+$MOVEBY\" | bc`"
    mv right/${FRAME}.$i right/${FRAME}.`echo "$i+$MOVEBY" | bc`
done
for i in `seq 0 $((MOVEBY-1))`
do
    mv right/${FRAME}.`echo "$NUMFRAMES+$i" | bc` right/${FRAME}.$i
done
for i in `seq -w 0 $(($NUMFRAMES-1))`
do
    mv right/${FRAME}.`echo $i | bc` right/${FRAME}.$i
done
 
mkdir sbs
 
for i in `seq -w 0 $(($NUMFRAMES-1))`
do
    convert left/${FRAME}.$i right/${FRAME}.$i +append sbs/${FRAME}.$i
done
 
gifsicle --loop=0 sbs/* > $OUTFILE