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It's at 720p so it's recording at the highest it can. Let me know when you upload the vid.
It's difficult to say from that video because I think most phones/home camcorders would struggle to cope with those volumes/frequencies.
I agree with you though, that does sound terrible. Is there that hiss on normal, every day vids too? If yes, then I'd say you have a problem.
i will try to make something with the retailer. 