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I watched the excellent documentary, Catfish. The sound was done by Coll Anderson.
There's debate as to whether or not it is real. I wonder if we can tell from the sound if it is or not.
When they are meeting the family, which supposedly do not know that they are filming, they all sound decently miked. This means (I think) that they would either see a boom or have had a radio mic put onto them...
ps: this is an after thought, I would need to watch it again to make sure.
I haven't seen this one, but I work on documentaries and am replacing sound ALL THE TIME!
I try to stick with the actual sounds that were recorded, or at least cut in a clean version of a sound from what we're actually hearing, but it's not uncommon to have producers/directors ask for the sound to be changed for more impact or "realism." It can be very strange at times.
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I have yet to watch it but a lot of "documentaries" and reality based productions are in fact staged.
They also could have dubbed everything with ADR? Although I think that is probably not too cost effective if you ask me.
edit: I am watching it right now and it seems the set-up is the following:
-One lavalier mic, under Nev's shirt.
-The camera built-in Microphone..
With this you should be able to pick up voice that is relatively close quite decently.
The initial meeting, before they go back to the car to grab more equipment doesn't sound too great. I think after the initial introduction they would have been miked in some way. As for real/fake, I think it's a bit of both. Either way, it's one of the most enjoyable films I've seen for years.