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#!/bin/sh
# See LICENSE file for copyright and license details.
set -e
usage () {
printf 'usage %s: [-t time] [-y] in-file out-file\n' "$0" >&2
exit 1
}
ffmpeg_flag_y=
ss=10
while getopts t:y flag; do
case "$flag" in
t)
ss="${OPTARG}";;
y)
ffmpeg_flag_y=-y;;
?)
usage;;
esac
done
shift $(( ${OPTIND} - 1 ))
if test ! $# = 2; then
usage
fi
in_file="$1"
if test -z "${in_file}"; then
usage
elif test ! "${in_file}" = -; then
in_file="file:${in_file}"
else
printf '%s: - is not supported for in-file\n' "$0" >&2
exit 1
fi
out_file="$2"
if test -z "${out_file}"; then
usage
elif test ! "${out_file}" = -; then
out_file="file:${out_file}"
else
printf '%s: - is not supported for out-file\n' "$0" >&2
exit 1
fi
ffmpeg -i "${in_file}" -ss "${ss}" -update 1 -frames:v 1 -c:v png -f image2pipe - | \
ffmpeg -f image2pipe -i - -i "${in_file}" -map 0:v:0 -map 1:a:0 -c:v png ${ffmpeg_flag_y} -- "${out_file}"
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