Alternator Correa Noise

Hi I've been visiting the forum for a long time, which has helped me. And now that I have registered I would like to raise a problem. First of all, to say that I am not a mechanic and probably I have no idea, but I always liked it and try to learn everything that time allows me.
Well, the case is as follows, when I start the car and I leave it to idle, you can see a noise that comes from the co -pilot wheel, where the straps are located .. I have looked at them and it does not seem that they are weaning, the truth is that of the song of Correaa I do not have much idea because I have never put hand to any ...
I have recorded a video in which the sound I say can be seen, there if anyone could guide me a little, since I am more lost than an octopus in a garage ..

Thanks in advance and greetings! By the way, I think I have put the prawn and published the message in the General Forum instead of mechanical problems ...

My friend to know if it is the strap that is loose or skating, takes a bottle of those that throw in "spray" you put water to rip off the vehicle with the hood or lift lifted you throw the spray water in the direction of the girdle, if it is removed it is the loose girdle. I tell you why hearing the video is similar to what happened to me. I hope it helps you. You tell us how it went. SLDS

Well, today with time I have got to work, and the truth that today has not appeared to me ... I have looked at the belt well and is very tense, so I do not think it is because it is weaning ... I think that it has been able to take a bit of moisture and that is why, the noise has appeared ... I so that I stay quieter ...