Create a quicktime movie that combines a looping animated gif with an mp3. The resulting movie will be the same length as the audio file.

gifmp3.sh

#!/bin/sh
#
# Create a quicktime movie that combines a looping animated gif with an mp3.  The resulting movie will 
# be the same length as the audio file.
#

if [ $(( $# - $OPTIND )) -lt 4 ]; then
    echo "Usage: $0 input.gif input.mp3 output.mov [framerate] [resolution]"
    exit 1
fi

mkdir /tmp/gifmp3
convert $1 /tmp/gifmp3/frame%05d.png
ffmpeg -i $2 -f image2 -loop 1 -i /tmp/gifmp3/frame%05d.png -r $4 -s $5 -c:v libx264 -crf 18 -tune stillimage -preset medium -shortest $3
rm -rf /tmp/gifmp3