create_map_sprites

#!/bin/bash


#./create_map_sprites file1 [file2 [file3..]] dest/

FILES="${@:1:$#-1}"
DEST="${@:(-1)}"

if [[ ! -d $DEST ]]; then
    echo "Destination must be a directory"
    echo "$DEST"
    exit 1
fi

WIDTH=180
HEIGHT=180

# Scale the map preview
SCALE_WIDTH="iw*min($WIDTH/iw\,$HEIGHT/ih)"
SCALE_HEIGHT="ih*min($WIDTH/iw\,$HEIGHT/ih)"
FILTER_SCALE="scale=$SCALE_WIDTH:$SCALE_HEIGHT"

# Pad the map preview
PAD_WIDTH="$WIDTH"
PAD_HEIGHT="$HEIGHT"
PAD_X="($WIDTH-iw*min($WIDTH/iw\,$HEIGHT/ih))/2"
PAD_Y="($HEIGHT-ih*min($WIDTH/iw\,$HEIGHT/ih))/2"
FILTER_PAD="pad=$PAD_WIDTH:$PAD_HEIGHT:$PAD_X:$PAD_Y"

FILTER="$FILTER_SCALE, $FILTER_PAD"

for i in $FILES; do
    if [[ ! -f "$i" ]]; then
        echo "$i is not a regular file. skipping"
        continue
    fi

    filename=`basename $i`
    extension="${filename##*.}"
    filename="${filename%.*}"

    $FFMPEG -i "$i" -filter:v "$FILTER" "$DEST/$filename.png" -y
done