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#!/bin/bash | |
# | |
# detect-crop.sh | |
# | |
# Copyright (c) 2013-2014 Don Melton | |
# | |
about() { | |
cat <<EOF | |
$program 2.0 of February 7, 2014 | |
Copyright (c) 2013-2014 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: $program [OPTION]... [FILE] | |
--title NUMBER select numbered title in video media (default: 1) | |
(\`0\` to scan media, list title numbers and exit) | |
--constrain constrain crop to only width or only height | |
--max-step MINUTES maximum interval between samples (default: 5) | |
(Must be integer between 1 and 10) | |
--help display this help and exit | |
--version output version information and exit | |
Requires \`HandBrakeCLI\` and \`mplayer\` executables in \$PATH. | |
EOF | |
exit 0 | |
} | |
syntax_error() { | |
echo "$program: $1" >&2 | |
echo "Try \`$program --help\` for more information." >&2 | |
exit 1 | |
} | |
die() { | |
echo "$program: $1" >&2 | |
exit ${2:-1} | |
} | |
calculate_crop() { | |
if [ "$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="$width" | |
crop_x='0' | |
fi | |
fi | |
fi | |
if (($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 | |
echo "mplayer -really-quiet -nosound -vf rectangle=$1 $(escape_string "$input")" | |
echo "mplayer -really-quiet -nosound -vf crop=$1 $(escape_string "$input")" | |
echo | |
echo "transcode-video.sh --crop $2 $(escape_string "$input")" | |
echo | |
} | |
readonly program="$(basename "$0")" | |
case $1 in | |
--help) | |
usage | |
;; | |
--version) | |
about | |
;; | |
esac | |
debug='' | |
title='1' | |
constrain='' | |
max_step=5 | |
while [ "$1" ]; do | |
case $1 in | |
--debug) | |
debug='yes' | |
;; | |
--title) | |
title="$(printf '%.0f' "$2")" | |
shift | |
if (($title < 0)); then | |
die "invalid title number: $title" | |
fi | |
;; | |
--constrain) | |
constrain='yes' | |
;; | |
--max-step|--step) | |
max_step="$(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 | |
;; | |
--with-handbrake) | |
# For backward compatibility only. | |
;; | |
-*) | |
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 file 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" != "$first_handbrake_crop" ]; then | |
echo 'Results differ.' >&2 | |
echo | |
echo '# From `HandBrakeCLI`:' | |
print_commands "$first_mplayer_crop" "$first_handbrake_crop" | |
echo '# From `mplayer`:' | |
else | |
echo 'Results are identical.' >&2 | |
fi | |
fi | |
print_commands "$mplayer_crop" "$handbrake_crop" |
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