#!/bin/sh
# _ :: path-directory [skip-resize?]
# creates a video from a directory filled with png files.
# if skip-resize? is "true", then it is assumed that the resize-pass has already run and resized pictures are available in the $source/edit directory.
#   this speeds up the compilation process significantly

# config
size=640x480
speed=6/1

# program-arguments
source=$1
skip_resize=$2

# prepare target directory
target=$HOME/temp/intervall-screenshots.$(basename $source)
if [ -e $target ]
then
  echo file exists
  exit 1
fi

# resize images to have the same width/height. otherwise the video width/height changes with each image
cd $source
mkdir -p edit
if [ $skip_resize ]
then
  echo resize skipped
else
  echo resizing
  delete-duplicate-files $PWD
  find -name "*.png" |nargsp mogrify -resize $size -background black -gravity center -extent $size -define png:color-type=2 -path edit
fi

# create video
ffmpeg -framerate $speed -pattern_type glob -i "edit/*.png" -c:v libx264 -r 30 -pix_fmt yuv420p $target.mp4 && rm -r edit