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|
#!/usr/bin/env zsh
# export a clip from a video as a gif
local callstr="$0"
local hasgsic=$(whence gifsicle)
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 <num> full length"
echo " gif fps -f <num> 10"
echo " gif pixel width -w <num> 480"
echo " use subtitles -b"
echo " use subtitle track -n <int> 0"
[[ $hasgsic ]] && echo "optimise with gifsicle -g"
echo " print this help -h"
exit 1
}
local start="00:00:00"
local length=""
local fps=10
local width=480
local subs=""
local strack=0
local gsic=""
local timepat='^(([0-9][0-9]:){1,2}[0-9][0-9]|[0-9]+)(\.[0-9]+){0,1}$'
local numpat='^[1-9][0-9]*(\.[0-9]+){0,1}$'
local intpat='^[1-9][0-9]*$'
local zintpat='^[0-9]+$'
# tmp var used to old '-t' if length is used
local t=""
# really annoying, but no other good way to do this
if [[ $hasgsic ]]; then
while getopts :s:t:f:w:bhn:g opt; do
case "$opt" in
s)
[[ ! $(echo $OPTARG | grep -oE "$timepat") ]] \
&& usage "malformed start timestamp"
start="$OPTARG"
;;
t)
[[ ! $(echo $OPTARG | grep -oE "$numpat") ]] \
&& usage "length must be a positive rational number"
length=$OPTARG
t="-t"
;;
f)
[[ ! $(echo $OPTARG | grep -oE "$numpat") ]] \
&& usage "fps must be a positive rational number"
fps=$OPTARG
;;
w)
[[ ! $(echo $OPTARG | grep -oE "$intpat") ]] \
&& usage "width must be a positive integer"
width=$OPTARG
;;
b) subs=true ;;
n)
[[ ! $(echo $OPTARG | grep -oE "$zintpat") ]] \
&& usage "sub track index must be a non-negative integer"
strack=$OPTARG
;;
g) gsic=true ;;
h) usage ;;
[?]) usage "unrecognised option" ;;
esac
done
else
while getopts :s:t:f:w:bhn: opt; do
case "$opt" in
s)
[[ ! $(echo $OPTARG | grep -oE "$timepat") ]] \
&& usage "malformed start timestamp"
start="$OPTARG"
;;
t)
[[ ! $(echo $OPTARG | grep -oE "$numpat") ]] \
&& usage "length must be a positive rational number"
length=$OPTARG
t="-t"
;;
f)
[[ ! $(echo $OPTARG | grep -oE "$numpat") ]] \
&& usage "fps must be a positive rational number"
fps=$OPTARG
;;
w)
[[ ! $(echo $OPTARG | grep -oE "$intpat") ]] \
&& usage "width must be a positive integer"
width=$OPTARG
;;
b) subs=true ;;
n)
[[ ! $(echo $OPTARG | grep -oE "$zintpat") ]] \
&& usage "sub track index must be a non-negative integer"
strack=$OPTARG
;;
h) usage ;;
[?]) usage "unrecognised option" ;;
esac
done
fi
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 "$1" ]] && usage "input file not found"
local paltmp="make-gif"
while [[ -f "${paltmp}-palette.png" ]] || [[ -f "${paltmp}-in" ]]; do
paltmp="${paltmp}-1"
done
ln -s "$1" "${paltmp}-in"
local fferr
if [[ $subs ]]; then
echo "pass 1..."
ffmpeg -loglevel 16 -y -ss $start $t $length -i "$1" -copyts \
-vf "subtitles=${paltmp}-in:si=$strack,fps=$fps,scale=$width:-1:flags=lanczos,palettegen" \
${paltmp}-palette.png
[[ $? -ne 0 ]] && fferr=true
[[ ! $fferr ]] && echo "pass 2..." && ffmpeg -loglevel 24 \
-ss $start $t $length -i "$1" -i ${paltmp}-palette.png \
-copyts -filter_complex \
"subtitles=${paltmp}-in:si=$strack,fps=$fps,scale=$width:-1:flags=lanczos[x];[x][1:v]paletteuse" \
"$2"
else
echo "pass 1..."
ffmpeg -loglevel 16 -y -ss "$start" $t $length -i "$1" \
-vf "fps=$fps,scale=$width:-1:flags=lanczos,palettegen" \
${paltmp}-palette.png
[[ $? -ne 0 ]] && fferr=true
[[ ! $fferr ]] && echo "pass 2..." && ffmpeg -loglevel 24 \
-ss $start $t $length -i "$1" -i ${paltmp}-palette.png -filter_complex \
"fps=$fps,scale=$width:-1:flags=lanczos[x];[x][1:v]paletteuse" \
"$2"
fi
rm -f ${paltmp}-palette.png
rm -f ${paltmp}-in
if [[ -f "$2" ]] && [[ ! $fferr ]]; then
if [[ $gsic ]]; then
local gsictmp="$2.out"
while [[ -f "$gsictmp" ]]; do
gsictmp="$gsictmp.out"
done
echo "optimising..."
gifsicle -O3 -i "$2" -o "$gsictmp"
[[ $? -eq 0 ]] && rm -f "$2" && mv "$gsictmp" "$2"
fi
fi
|
