I have this sound from my car, cannot identify the source, I recorded this sound with the camera under the hood but it only makes the noise when I am rolling and goes away after about 10 minutes so I am lost, if you heard this before and know what it is please reply !

 

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It's got that " loose sheet metal, touching something feel" to it...goes away when exhaust good and warm might suggest loose baffle in cat. If me, I would jack up car, put on ramps checking front first, after removing all 3 splash shields and take a rubber mallet and start tapping somewhat vigorously all the exhaust pipes, cats, other parts and any metal heat shields you come across, checking pipe hangers,, if any, for failure or frame tolerance problems. Higher mileage would make these parts, particularly the cat's internals suspect.

Good Luck