Tutorial Render script

#!/bin/bash

mkdir output
endurl="https://youtu.be/tSbv3jcSuNM"
introurl="https://youtu.be/ySE1kYtrsj0,https://youtu.be/nksGb6mRAzE,https://youtu.be/wmA7I7dSYXs"
introurl="$(echo "$introurl"|tr "," "\n"|shuf -n 1)"

endvid="/tmp/yellowsun.mp4"
introvid="/tmp/intro.mp4"

youtube-dl -c "$endurl" -o "$endvid"
rm "$introvid"
youtube-dl -c "$introurl" -o "$introvid"

#for i in *.{mkv,avi,mp4,MOV,mov}
ls *.{mkv,avi,mp4,MOV,mov}|while read i
do
  #get tech tip/fact url and make qrcode
  echo "https://www.youtube.com/watch?v=$(wget -qO- "https://pastebin.com/raw/BP6ys0h5"|shuf -n 1)"|qrencode -o /tmp/tip.png
  echo "============$i================="
  melt "$introvid" -mix 30 -mixer luma -mixer mix:-1 "$i" -mix 30 -mixer luma -mixer mix:-1 "$endvid" -mix 30 -mixer luma -mixer mix:-1 "/tmp/tip.png" in=1 out=5 -consumer avformat:"output/$i" acodec=mp2 ab=128k