didier[~]$ mpv --no-video https://www.youtube.com/watch?v=Pt-oZc5_0Ak                                                                           
Playing: https://www.youtube.com/watch?v=Pt-oZc5_0Ak
[ytdl_hook] ERROR: Unable to extract JS player URL; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
[ytdl_hook] youtube-dl failed: unexpected error ocurred 
Failed to recognize file format.


Exiting... (Errors when loading file)

#!/usr/bin/bash

#Utube video-audio player, downloader. Needs python3 for youtube-dl.
#Latest at youtube-dl http://youtube-dl.org/

#Select video player here
#player="mpv"
player="mplayer"
#player="ffplay"

#youtube-dl binary $PATH
ytdl="/home/path/to/youtube-dl"

PS3="
Select an option.: "
					
while :; do
    clear
    options="Quit Formats Watch Listen Download GetURL"
    select opt in $options; do
        case $opt in
            Quit) clear; exit;;
            
            Formats) read -p "Enter/Paste Utube URL: " form
                "$ytdl" -F "$form"
                read -p "$Enter to continue. "
                break ;;

            Watch) read -p "Enter/Paste Utube video URL: " view	
                "$ytdl" -q -f 18 "$view" -o - | "$player" -
                break ;;
            
            Listen) read -p "Enter/Paste Utube audio URL: " aud
                "$ytdl" -q -f 140 "$aud" -o - | "$player" -
                break ;;

            Download) read -p "Enter/Paste Utube URL: " dl
                read -p "What format number?  Ex: 0 18 22 139 140: " dfmat
                num=1
                    until [ ! -e ut$num.* ]; do
                        num=$(( $num + 1 ))
                    done
                "$ytdl" -q -f "$dfmat" "$dl" -o ut"$num"."%(ext)s"
                break ;;
                
            GetURL) read -p "Enter/Paste Utube URL: " gurl
                read -p "What format number?  Ex: 0 18 22 135 140: " gfmat
                "$ytdl" -q -f "$gfmat" -g "$gurl"
                read -p "Enter after copying URL: "
                break ;;
        esac
    done
done

from youtube_dl import YoutubeDL