Parole does not support youtube links. VLC and smplayer do.
I don't mind too much as I have other multimedia players and there is a workaround by downloading the video with youtube-dl.
I will edit the line of the subject as solved but it is a limitation of Parole which is the media player ...

Maybe this:
http://www.linuxquestions.org/questions/slackware-14/parole-media-player-4175562470/

That is, try installing the "optional dependencies" listed here:
https://slackbuilds.org/slackbuilds/14.1/multimedia/gst-plugins-bad/README
https://slackbuilds.org/slackbuilds/14.1/multimedia/gst ...

But if I launch Parole and I try to open a location I get the message Parole needs a decoder text/html to play this file.
Are you trying to play a web page ?
Hello gapan !
In VLC or SMPlayer when I go to YouTube and I copy the link of the video into the appropriate field I have no problem at all ...

PS: I don't know how to transform this post into SOLVED.
Just edit the subject line of your original post.

I'm glad you got it sorted out!
Hello mimosa,
I have another problem now. I can play a video when I have downloaded one thanks to youtube-dl. But if I launch Parole and I try to open a ...

After launching Parole, menu Tools/Preferences/Display tab, change to a different video output that works for you.
Hello gapan _
This fixed the issue. The default display comes with Xv and I had to choose X11 without Xv. What amazes me is that I have everything related to Xv installed so I don't ...

Here is the link: https://www.youtube.com/watch?v=Fx-h3n0RWso
I did several things. I tried to open this video from a location without success. I downloaded it with youtube-dl with the best format. I tried to launch Parole by opening a file and selecting the video I downloaded without success. I ...

Hello !
I tried to launch a video with Parole. I always got the following error message: Gstreamer runtime error: cannot initialize Xv output. I have VLC which works fine and also mpv which works fine. I do have the xv libraries installed. I have all the necessary gst libraries installed.
I don't ...

Je viens de trouver le problème. J'avais un fichier /etc/slapt-get/slapt-getrc.new qui probablement m'empêchait d'actualiser les sources.
Je l'ai regardé et j'ai constaté que les sources pointaient vers salix.hostingxtreme.com que l'on ne peut atteindre.
J'ai donc supprimé ce fichier et repris des ...

Bonjour,
Je ne parviens plus à actualiser les donées de Gslapt quelle que soit la source que je choisis. J'ai même modifié manuellement le dossier /etc/slapt-get/slapt-getrc sans succès. A chaque fois, j'ai un message comme quoi la source n'est pas accessible.
Ma connexion réseau est bonne: je peux ...