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|
#!/usr/bin/env zsh
# export a clip from a video as a gif
local callstr="$0"
usage() {
[[ "$1" != "" ]] && echo -e "\e[1;31merror:\e[0m $1\n"
echo "Usage: $callstr [OPTIONS...] <infile> <outfile>"
echo ""
echo "description option default val"
echo "start time -s <time> 00:00:00"
echo "length in seconds -t <int> full length"
echo "gif fps -f <int> 10"
echo "gif pixel width -w <int> 480"
echo "use subtitles -b"
echo "print this help -h"
exit 1
}
local start="00:00:00"
local length=""
local fps=10
local width=480
local subs=""
local timepat='^(([0-9][0-9]:){1,2}[0-9][0-9]|[0-9]+)$'
local intpat='^[0-9][0-9]*$'
local t=""
while getopts s:t:f:w:bh opt; do
case "$opt" in
s)
[[ ! $(echo $OPTARG | grep -oE "$timepat") ]] \
&& usage "malformed start timestamp"
start="$OPTARG"
;;
t)
[[ ! $(echo $OPTARG | grep -oE "$intpat") ]] \
&& usage "length must be an integer"
length=$OPTARG
t="-t"
;;
f)
[[ ! $(echo $OPTARG | grep -oE "$intpat") ]] \
&& usage "start time must be an integer"
fps=$OPTARG
;;
w)
[[ ! $(echo $OPTARG | grep -oE "$intpat") ]] \
&& usage "fps must be an integer"
width=$OPTARG
;;
b) subs=true ;;
h) usage ;;
[?]) usage ;;
esac
done
shift $OPTIND-1
[[ ${#@} -gt 2 ]] && usage "trailing arguments detected"
[[ ${#@} -lt 2 ]] && usage "no output file specified"
[[ "${2:e}" != "gif" ]] && usage "output file must have a .gif file extension"
[[ ! -f "$1" ]] && usage "input file not found"
rm -f make-gif-palette.png
rm -f make-gif-in
ln -s "$1" make-gif-in
if [[ $subs ]]; then
echo "pass 1..."
ffmpeg -loglevel 16 -y -ss $start $t $length -i "$1" -copyts \
-vf "subtitles=make-gif-in,fps=$fps,scale=$width:-1:flags=lanczos,palettegen" \
make-gif-palette.png
[[ $? -eq 0 ]] && echo "pass 2..." && ffmpeg -loglevel 24 \
-ss $start $t $length -i "$1" -i make-gif-palette.png \
-copyts -filter_complex \
"subtitles=make-gif-in,fps=$fps,scale=$width:-1:flags=lanczos[x];[x][1:v]paletteuse" \
out.gif
else
echo "pass 1..."
ffmpeg -loglevel 16 -y -ss "$start" $t $length -i "$1" \
-vf "fps=$fps,scale=$width:-1:flags=lanczos,palettegen" \
make-gif-palette.png
[[ $? -eq 0 ]] && echo "pass 2..." && ffmpeg -loglevel 24 \
-ss $start $t $length -i "$1" -i make-gif-palette.png -filter_complex \
"fps=$fps,scale=$width:-1:flags=lanczos[x];[x][1:v]paletteuse" \
out.gif
fi
rm -f make-gif-palette.png
rm -f make-gif-in
|
