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Detect crop values for video file to use with `mplayer` and `transcode-video.sh` (a wrapper script for `HandBrakeCLI`).
#!/bin/bash
#
# detect-crop.sh
#
# Copyright (c) 2013-2015 Don Melton
#
about() {
cat <<EOF
$program 3.3 of January 22, 2015
Copyright (c) 2013-2015 Don Melton
EOF
exit 0
}
usage() {
cat <<EOF
Detect crop values for video file or disc image directory to use with
\`mplayer\` and \`transcode-video.sh\` (a wrapper script for \`HandBrakeCLI\`).
Usage: $program [OPTION]... [FILE|DIRECTORY]
--title NUMBER select numbered title in video media (default: 1)
(\`0\` to scan media, list title numbers and exit)
--max-step MINUTES maximum interval between samples (default: 5)
(Must be integer between 1 and 10)
--no-constrain don't constrain crop to optimal shape
--values-only output only unambiguous crop values, not commands
--help display this help and exit
--version output version information and exit
Requires \`HandBrakeCLI\` and \`mplayer\` executables in \$PATH.
EOF
exit 0
}
syntax_error() {
echo "$program: $1" >&2
echo "Try \`$program --help\` for more information." >&2
exit 1
}
die() {
echo "$program: $1" >&2
exit ${2:-1}
}
deprecated() {
echo "$program: deprecated option: $1" >&2
}
calculate_crop() {
if [ "$constrain" ]; then
local delta_x="$(($width - $crop_width))"
local delta_y="$(($height - $crop_height))"
if (($delta_x && $delta_y)); then
if (($delta_x > $delta_y)); then
crop_height="$height"
crop_y='0'
else
crop_width="$width"
crop_x='0'
fi
fi
local min_crop="$(($width / 64))"
min_crop="$(($min_crop + ($min_crop % 2)))"
delta_x="$(($width - $crop_width))"
if (($delta_x && ($delta_x < $min_crop))); then
crop_width="$width"
crop_x='0'
fi
delta_y="$(($height - $crop_height))"
if (($delta_y && ($delta_y < $min_crop))); then
crop_height="$height"
crop_y='0'
fi
fi
if (($crop_width == 0)); then
crop_width="$width"
fi
if (($crop_height == 0)); then
crop_height="$height"
fi
if (($crop_x == $width)); then
crop_x='0'
fi
if (($crop_y == $height)); then
crop_x='0'
fi
mplayer_crop="$crop_width:$crop_height:$crop_x:$crop_y"
handbrake_crop="$crop_y:$((height - (crop_y + crop_height))):$crop_x:$((width - (crop_x + crop_width)))"
}
escape_string() {
echo "$1" | sed "s/'/'\\\''/g;s/^\(.*\)$/'\1'/"
}
print_commands() {
echo
if [ -f "$input" ]; then
echo "mplayer -really-quiet -nosound -vf rectangle=$1 $(escape_string "$input")"
echo "mplayer -really-quiet -nosound -vf crop=$1 $(escape_string "$input")"
echo
fi
echo "transcode-video.sh $([ "$title" == '1' ] || echo "--title $title ")--crop $2 $(escape_string "$input")"
echo
}
readonly program="$(basename "$0")"
case $1 in
--help)
usage
;;
--version)
about
;;
esac
debug=''
title='1'
constrain='yes'
max_step=5
values_only=''
while [ "$1" ]; do
case $1 in
--debug)
debug='yes'
;;
--title)
title="$(printf '%.0f' "$2")"
shift
if (($title < 0)); then
die "invalid title number: $title"
fi
;;
--max-step|--step)
max_step="$(printf '%.0f' "$2")"
shift
if (($max_step < 1)); then
syntax_error 'maximum step value too small'
elif (($max_step > 10)); then
syntax_error 'maximum step value too large'
fi
;;
--no-constrain)
constrain=''
;;
--constrain)
deprecated "$1"
constrain='yes'
;;
--values-only)
values_only='yes'
;;
--with-handbrake)
deprecated "$1"
;;
-*)
syntax_error "unrecognized option: $1"
;;
*)
break
;;
esac
shift
done
readonly input="$1"
if [ ! "$input" ]; then
syntax_error 'too few arguments'
fi
if [ ! -e "$input" ]; then
die "input not found: $input"
fi
if ! $(which HandBrakeCLI >/dev/null); then
die 'executable not in $PATH: HandBrakeCLI'
fi
if ! $(which mplayer >/dev/null); then
die 'executable not in $PATH: mplayer'
fi
if [ "$title" == '0' ]; then
echo "Scanning: $input" >&2
samples='2'
else
samples='1'
fi
media_info="$(HandBrakeCLI --title $title --scan --previews $samples:0 --input "$input" 2>&1)"
if [ "$debug" ]; then
echo "$media_info" >&2
fi
if [ "$title" == '0' ]; then
readonly formatted_titles_info="$(echo "$media_info" |
sed -n '/^+ title /,$p' |
sed '/^ + autocrop: /d;/^ + support /d;/^HandBrake/,$d;s/\(^ *\)+ \(.*$\)/\1\2/')"
if [ ! "$formatted_titles_info" ]; then
die "no media title available in: $input"
fi
echo "$formatted_titles_info"
exit
fi
if [ ! "$(echo "$media_info" | sed -n '/^+ title /,$p')" ]; then
echo "$program: \`title $title\` not found in: $input" >&2
echo "Try \`$program --title 0 [FILE|DIRECTORY]\` to scan for titles." >&2
echo "Try \`$program --help\` for more information." >&2
exit 1
fi
readonly size_array=($(echo "$media_info" | sed -n 's/^ + size: \([0-9]\{1,\}\)x\([0-9]\{1,\}\).*$/\1 \2/p'))
if ((${#size_array[*]} != 2)); then
die "no video size information in: $input"
fi
readonly width="${size_array[0]}"
readonly height="${size_array[1]}"
readonly duration_array=($(echo "$media_info" |
sed -n 's/^ + duration: \([0-9][0-9]\):\([0-9][0-9]\):\([0-9][0-9]\)$/ \1 \2 \3 /p' |
sed 's/ 0/ /g'))
if ((${#duration_array[*]} != 3)); then
die "no duration information in: $input"
fi
readonly duration="$(((duration_array[0] * 60 * 60) + (duration_array[1] * 60) + duration_array[2]))"
if (($duration < 2)); then
die "duration too short in: $input"
fi
max_step="$((max_step * 60))"
step="$((duration / 12))"
if (($step < 1)); then
step='1'
elif (($step > $max_step)); then
step="$max_step"
fi
samples="$(((duration / step) + 1))"
echo "Detecting: $input" >&2
if [ -f "$input" ]; then
echo 'Scanning with `HandBrakeCLI`...' >&2
fi
media_info="$(HandBrakeCLI --title $title --scan --previews $samples:0 --input "$input" 2>&1)"
readonly autocrop_array=($(echo "$media_info" |
sed -n 's|^ + autocrop: \([0-9/]*\)$|\1|p' |
sed 's|/| |g'))
if ((${#autocrop_array[*]} != 4)); then
die "no autocrop information in: $input"
fi
if [ "$debug" ]; then
echo "${autocrop_array[*]}" | sed 's/ /:/g' >&2
fi
crop_x="${autocrop_array[2]}"
crop_y="${autocrop_array[0]}"
crop_width="$((width - crop_x - ${autocrop_array[3]}))"
crop_height="$((height - crop_y - ${autocrop_array[1]}))"
calculate_crop
first_mplayer_crop="$mplayer_crop"
first_handbrake_crop="$handbrake_crop"
if [ -f "$input" ]; then
crop_width='0'
crop_height='0'
crop_x="$width"
crop_y="$height"
last_line=''
last_timestamp="$(date +%s)"
echo 'Scanning with `mplayer`...' >&2
for start in $(seq $step $step $((duration - step))); do
while read line; do
if [ ! "$line" ]; then
continue
fi
if [ "$line" != "$last_line" ]; then
if [ "$debug" ]; then
echo "$line" >&2
else
timestamp="$(date +%s)"
if ((($timestamp - $last_timestamp) >= 5)); then
last_timestamp="$timestamp"
echo 'Scanning with `mplayer`...' >&2
fi
fi
line_array=($(echo "$line" | sed 's/:/ /g'))
if (($crop_width < ${line_array[0]})); then
crop_width="${line_array[0]}"
fi
if (($crop_height < ${line_array[1]})); then
crop_height="${line_array[1]}"
fi
if (($crop_x > ${line_array[2]})); then
crop_x="${line_array[2]}"
fi
if (($crop_y > ${line_array[3]})); then
crop_y="${line_array[3]}"
fi
fi
last_line="$line"
done < <(
mplayer -quiet -benchmark -vo null -ao null -vf cropdetect=24:2 "$input" -ss $start -frames 10 2>/dev/null |
sed -n 's/^.*crop=\([0-9]\{1,\}:[0-9]\{1,\}:[0-9]\{1,\}:[0-9]\{1,\}\).*$/\1/p'
)
done
calculate_crop
if [ "$mplayer_crop" != "$first_mplayer_crop" ] || [ "$handbrake_crop" != "$first_handbrake_crop" ]; then
echo 'Results differ.' >&2
if [ "$values_only" ]; then
echo "From \`HandBrakeCLI\`: $first_handbrake_crop" >&2
echo "From \`mplayer\`: $handbrake_crop" >&2
exit 1
fi
echo
echo '# From `HandBrakeCLI`:'
print_commands "$first_mplayer_crop" "$first_handbrake_crop"
echo '# From `mplayer`:'
else
echo 'Results are identical.' >&2
fi
fi
if [ "$values_only" ]; then
echo "$handbrake_crop"
exit
fi
print_commands "$mplayer_crop" "$handbrake_crop"
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