#!/bin/bash

# Unofficial Bash Strict Mode http://redsymbol.net/articles/unofficial-bash-strict-mode/
set -euo pipefail
IFS=$'\n\t'

# Get current dir
TOP_DIR=`pwd`

# Change to export dir
cd downloads
for i in *.flv; do
  # Get file name without extension
  _filename=`basename "${i}" ".flv"`

  # Split .flv in .264/.aac files. Needs ffmpeg installed.
  echo "Spliting video of file ${_filename}.flv"
  ffmpeg -i "${_filename}.flv" -vcodec copy -vbsf h264_mp4toannexb "${_filename}.h264" -acodec copy "${_filename}.aac" 
  
  # Merge .264/.aac/.ass files in .mkv. Needs mkvtoolnix installed.
  echo "Starting mkvmerge of file ${_filename}"
  if [ ! -f ${_filename}.ass ]; then
    mkvmerge -o "${_filename}.mkv" "${_filename}.h264" --aac-is-sbr 0 "${_filename}.aac"
  else
    mkvmerge -o "${_filename}.mkv" "${_filename}.ass" "${_filename}.h264" --aac-is-sbr 0 "${_filename}.aac"
  fi
done

# Delete all temporary files
echo "Cleaning temporary files"
find . -type f ! -iname '*.mkv' -delete

# Go back to original dir
cd "${TOP_DIR}"