Generate thumbnails and output media info

create-thumbnails

#!/bin/bash

parse_time() {
    IFS=' ' read -ra PART <<< "$1"
	seconds=0
    for i in "${PART[@]}"; do
		number=$(expr match $i '\([0-9]\+\)')
		unit=$(expr match $i '[0-9]*\([a-z]\+\)')
		case $unit in
			h)
				seconds=$(($seconds+$(($number*3600))))
				;;
			mn)
				seconds=$(($seconds+$(($number*60))))
				;;
			*)
				seconds=$(($seconds+$number))
				;;
		esac
    done
	echo $seconds
}

pretty_time() {
	seconds=$1
	hours=$(($seconds / 3600))
	seconds=$(($seconds % 3600))
	minutes=$(($seconds / 60))
	seconds=$(($seconds % 60))

	printf "%02d:%02d:%02d" $hours $minutes $seconds
}

genthumb() {
	VIDEO="$1"
	NAME=${VIDEO%.*}

	# Generate the media info
	mediainfo "$VIDEO" > "$NAME.txt"

	SECS="$(parse_time "$(grep -m 1 Duration "$NAME.txt" | cut -d: -f2)")"
	STEP=$(echo "($SECS / 4) - ($SECS / 4 * 0.1 / 1)" | bc)

	# Generate the thumbnails
	mplayer -quiet -vo jpeg -ss $STEP -sstep $STEP -frames 4 "$VIDEO"

	# Find out the width of the thumbnails
	WIDTH=$(identify -format %w 00000001.jpg)
	HEIGHT=$(identify -format %h 00000001.jpg)

	# Annotate the images
	for i in `seq 1 4`; do
		TIME=$(pretty_time $(($STEP*$i)))
		convert -background '#0008' -fill white -gravity south-east \
			-font /usr/share/fonts/TTF/DejaVuSans.ttf \
			-size "55x14" \
			caption:"$TIME" "0000000$i.jpg" \
			+swap -gravity south-east -composite "0000000$i.jpg.tmp"
		mv "0000000$i.jpg.tmp" "0000000$i.jpg"
	done

	# Generate the tiled image
	montage -font /usr/share/fonts/TTF/DejaVuSans.ttf \
		-border 0 -geometry ${WIDTH}x -tile 2x2 \
		0000000{1,2,3,4}.jpg "${NAME}.jpg"
	
	# Generate the header

	# Remove the tiles
	rm 0000000{1,2,3,4}.jpg
}

for ARG in "$@"; do
	genthumb "$ARG"
done;