Script to download videos from YouTube using Dropbox and IFTTT automation (IFTTT recipe: https://ifttt.com/recipes/277403-download-every-youtube-video-you-add-to-your-watch-later-playlist-automatically)

dropbox_youtube_dl.sh

#!/bin/bash

### Original script by Geoffeg, modified by Roblight and later by me (alias me='alias Danog='Daniil Gentili'')
### How to install this script:
### wget https://gist.github.com/danog/a3963463892f7f7df74a/raw/dropbox_youtube_dl.sh -O ~/dropbox_youtube_dl.sh && chmod 755 ~/dropbox_youtube_dl.sh && ~/dropbox_youtube_dl.sh --install
###
### IFTTT Recipe URL: https://ifttt.com/recipes/277403-download-every-youtube-video-you-add-to-your-watch-later-playlist-automatically

if [ "$1" = "--install" ]; then
 if [ -f /usr/local/bin/youtube-dl ]; then echo "Youtube-dl already installed."; else echo "Installing youtube-dl..."; sudo curl https://yt-dl.org/downloads/2015.04.03/youtube-dl -o /usr/local/bin/youtube-dl && sudo chmod a+x /usr/local/bin/youtube-dl && echo "YouTube-dl installed successfully." || echo "Couldn't install YouTube-dl."; fi
 
 if [ -f ~/.dropbox-dist/dropboxd ]; then echo "Dropbox already installed."; else
  echo "Installing Dropbox..."
  platform=`uname -m | tr '[A-Z]' '[a-z]'`
  case $platform in
   "x86_64")
       DROPBOXURL="http://www.dropbox.com/download?plat=lnx.x86_64"
       ;;
   *)
       DROPBOXURL="http://www.dropbox.com/download?plat=lnx.x86"
       ;;
  esac
  cd ~ && wget -O - $DROPBOXURL | tar xzf - && ~/.dropbox-dist/dropboxd && echo "Dropbox installed successfully." || echo "Couldn't install Dropbox."; fi

 [ -f /usr/bin/dropbox.py ] || sudo wget -O /usr/bin/dropbox.py https://www.dropbox.com/download?dl=packages/dropbox.py


 crontab -l | grep -q "dropbox_youtube_dl.sh"; if [ "$?" = "0" ]; then echo "Crontab already edited."; else echo "Editing crontab..."; oldcron=$(crontab -l) && echo "$oldcron
 * * * * * ~/dropbox_youtube_dl.sh" | crontab - && echo "Crontab edited successfully." || echo "Couldn't edit crontab."; fi

 while [[ -z $tmpout ]]; do echo -n "Please enter the path of the directory where the video files should be downloaded and remember, put a '\' before spaces in directory names: "; read tmpout; done
 
 echo "$tmpout" > ~/.dropytdlrc && echo "All done!"
 exit $?
fi

[ "$1" = "--folder" ] && { while [[ -z $tmpout ]]; do echo -n "Please enter the path of the directory where the video files should be downloaded and remember, put a '\' before spaces in directory names: "; read tmpout; done; echo "$tmpout" > ~/.dropytdlrc && echo "All done!"; exit $?; }


[ "$1" = "--help" ] && echo "Script to download videos from YouTube using Dropbox and IFTTT automation (specifically this recipe:
https://ifttt.com/recipes/277403-download-every-youtube-video-you-add-to-your-watch-later-playlist-automatically)
This script will automatically check ~/Dropbox/IFTTT/youtube-dl
for new text files containing YouTube video urls and it will download them
automatically into the directory you specified during initial configuration or in ~/Videos_YouTube
if initial configuration was never run.

Options: 
--install   Installs required dependencies, sets up crontab and sets up download folder.
--folder    Sets up download folder.
--help      Shows this extremely helpful message.
 " && exit



queue_files_dir=~/Dropbox/IFTTT/youtube-dl
queue_files="$queue_files_dir"/*.txt
output_dir=$(cat ~/.dropytdlrc 2>/dev/null || { [ -d ~/Videos_YouTube ] && echo -n "~/Videos_YouTube" || { mkdir ~/Videos_YouTube/ && echo -n "~/Videos_YouTube/"; }; })

dropbox.py start >/dev/null

shopt -s nullglob

for queue_file in $queue_files; do
  video_url=`cat "$queue_file"`
  echo "processing $queue_file: $video_url"
  mv "$queue_file" "$queue_files_dir/processed"
  youtube-dl -f 18 -o "$output_dir/%(title)s-%(id)s.%(ext)s" "$video_url"
# youtube-dl -q -o "$output_dir%(stitle)s.%(ext)s" "$video_url"
done

Does youtube-dl print a log anywhere? I'm having trouble getting this working. Everything seems fine but the videos don't seem to be output anywhere after being processed. Tried a few different folders with no luck.