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name=${0##*/}
name=${name%.sh}
rm -f -- "${name}.part1.gif" "${name}.part2.gif" "${name}.concat.txt" "${name}.gif"
# Create a 320x240 clip
ffmpeg -f lavfi -t 2 -i testsrc=r=30:s=320x240 "${name}.part1.gif"
# Create a 640x480 clip
ffmpeg -f lavfi -t 2 -i testsrc=r=30:s=640x480 "${name}.part2.gif"
# Create a text file with the list of files
{
echo "file '${name}.part1.gif'"
echo "file '${name}.part2.gif'"
} > "${name}.concat.txt"
# Concatenate the clips
ffmpeg -f concat -safe 0 -i "${name}.concat.txt" -c:v copy "${name}.nut"
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