Thanks very much Icarolongo! it worked! :D
Your description was very detailed and easier to understand and is a good
step by step on "how to do" for newcomers like me.
Like BugRep said about Unplug i did it for normal videos.
But on another hand i am still trying to understand the notion about Gnash:
"If you want to check for an RTSP link, disable the Gnash plugin (called
"Shockwave Flash" in the plugins list). Install the User Agent Switcher
extension and identify yourself as some Android browser (try a few different
ones), as an iPad, and as an iPhone." (onpon4)
"I don't have Gnash (free software Flash player that comes with Trisquel)
and I see HTML5 video player (...)Try disabling Gnash (Tools/Add
ons/Plugins => Shockwave Flash in the browser)" (Ivaylo)
So far all say basically the same: "disable Gnash". Maybe my question is
stupid but... why Trisquel come by default with Gnash?
I saw rigth now the post "Live event streaming" by funyotros and he says: "It
worked!(...) Just for the record I used UAControl and User-Agent JS Fixer
extensions. No need of UnPlug. Just click on the video and choose VLC from
the list." I downloaded UAControl and User-Agent JS via add-ons>get extras
and i tried for Fatima's site just to try and learning. Of course it didnt
result as i was expecting because of flash. But i wonder why funyotros could
see on Keykjavick site if there is a Adobe Flash Technology and on Fatima's
site dont work. There is different adobe flash technologies?
Thanks to all who answered to my questions and next step is creating a proper
nickname like ssdclickofdeath said. I am starting to understand why t3g said
about comercial sites that uses flash: " (...) it can run on any browser as a
plugin regardless of vendor (...)is easier to serve protected content because
a user cannot directly download the video file(...)".
Thanks again.