Rattle in Engine WITH VIDEO

[MMBZHP]

Hey there guys
I have this weird clanking noise in my engine bay. I tried and talked to a few mechanics and just want to assure if this is the problem as I plan to fix or repair the problem myself.
I was told it was the tensioner pulley is worn out, it makes a bit if a crank noise as you call tell in video. The link is below.

The noise starts from the minute I crank the car to when it is off. I heard right between the fan and the pulleys.

I have searched online and watched a couple vids on similar scenarios but nothing has given me a solid answer.
I would really appreciate if maybe one of guys could give me an answer or can share your experience with me if you had a similar problem thanks guys.

http://m.youtube.com/watch?v=zGQlhUB0jJk

[Dave1027]

I was told it was the tensioner pulley is worn out,
That sounds like a correct diagnosis to me.

[MMBZHP]

That sounds like a correct diagnosis to me.

Thank you DAVE!!!
Greatly appreciate it

[ELCID86]

Yep, Idler or tensioner.

[MMBZHP]

Thank you both plan on changing the tensioner pulley this weekend.

I also have a lil question maybe you guys could enlighten me on.
Sometimes on rare tries. My car cranks longer then normal or even needs a second crank. I didn't think the fuel pump because I hear it engage.
I also bought a brand new battery so I can rule that out.
Much appreciated for all and any advice