# README:
#
# Run this script as follows:
#
# ./video.sh urls.txt videos
#
#  Where urls.txt is a list of RTSP links
# and videos is the directory that you would
# like to save the downloaded videos to. If
# the designated directory does not exist, it
# will be created automatically.
#
# NOTE: DO NOT APPEND a / after the directory name

file=$1
dir=$2

# Create the directory if it
# does not exist already.
create_dir() {
  mkdir -p $dir
}

# Pipe each stream into a file
# in the designated output directory
download() {
  # echo $1 $2
  ffmpeg -i $1 -acodec copy -vcodec copy $2 < /dev/null
}

# Iterate through the input file line by line
# Download each file by URL
iterate() {
  pids=""

  while read url; do
    filename=$(echo "$url" | sed 's:.*/::')
    download $url "$dir/$filename" &
    pids="$pids ${!}"
  done < $file

  for pid in $pids; do
    wait $pid || let "RESULT=1"
  done

  if [ "$RESULT" == "1" ]; then
    return 1
  fi
}

main() {
  create_dir
  iterate
}

main