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#!/bin/bash
name="thumbnail"
version="1.0"
read -r -d '' help_message <<-EOF
Extract a thumbnail from a video
Usage: thumbnail [OPTIONS] TARGET [TARGET..]
Options:
-h, --help print this message
-q, --quiet suppress error messages and prompts
-t, --timestamp timestamp to extract thumbnail from
-v, --verbose show additional messages
-V, --version print version number and exit
EOF
source /usr/local/lib/mylib.bash
positional=()
quiet=
timestamp="00:00:10.000"
verbose=
while [[ $# -gt 0 ]]; do
case "$1" in
-h|--help)
help_msg
shift
;;
-q|--quiet)
debug_msg "Setting quiet option to 1 (was ${quiet})"
quiet=1
shift
;;
-t|--time|--timestamp)
debug_msg "Setting timestamp option to '${2}' (was '${timestamp}')"
timestamp="$2"
shift; shift
;;
-v|--verbose)
debug_msg "Setting verbose option to 1 (was ${verbose})"
verbose=1
shift
;;
-V|--version)
version_msg
;;
*)
debug_msg "Argument '${1}' added to positional array"
positional+=("$1")
shift
;;
esac
done
if [[ "${#positional[@]}" -eq 0 ]]; then
usage_msg
fi
printf "$timestamp" | grep -e '^[0-9][0-9]:[0-9][0-9]:[0-9][0-9].[0-9][0-9][0-9]$' >/dev/null 2>&1
if [[ $? -ne 0 ]]; then
error_msg "Not a valid timestamp ('${timestamp}') - must be 'HH:MM:SS.sss'"
fi
code=0
for filename in "${positional[@]}"; do
if [[ ! -f "$filename" ]]; then
nonfatal_error_msg "No such file '$filename'"
code=1
elif [[ "$filename" = *.png ]]; then
nonfatal_error_msg "Skipping file '$filename' - already an image"
else
dirname="$(dirname "$filename")"
basename="$(basename "$filename")"
basestub="${basename%.*}"
debug_msg "ffmpeg -i '${basename}' -hide_banner -loglevel error -ss '${timestamp}' -frames:v 1 -update 1 '${basestub}.png'"
(cd "$dirname" && ffmpeg -i "$basename" -hide_banner -loglevel error -ss "$timestamp" -frames:v 1 -update 1 "$basestub.png")
fi
done
exit "$code"