How did they record the sound in this video?

I doubt there was much that was "live" about this video. That is, it was obviously comprised of multiple takes and angles. Notice how there are several close-ups of instruments and hands yet, when they cut to a wide shot, you don't see any cameras near the musicians. This may not help with your exact question but it shows there were multiple opportunities to record the sound in a number of ways other than "live".

My guess is that the musicians were recorded together at an earlier time and that recording was played back (via an unseen PA or other sound system) in the street scene as they all played (or mimed) in unison. Same with the voices. There was nothing spontaneous about it - most everyone you see in this video was in on it. There may have been a few crowd members that walked up on the scene not realizing (at first) that it was a production.

The whole thing was staged, blocked for cameras, and rehearsed. I believe this is true of most of the better "flash mob" videos.

That said, well done.
 
I pretty much agree. It's possible that it was a bit more "live" though. There are a number of folks who look like they are shooting DSLR's and you can really get pretty invisible with that. It is also quite possible to have a couple of plant mics that you don't notice.

But it is an ad so you kind of need to keep that in mind. So it is also completely possible all the sound was added after the fact. If you had any doubts about the "staged" aspect then the city logo badges almost everyone is wearing would be your first give away.

Very well done. Probably if you took the time to diagram it all out you could tell where things were shot from. Also it may well have been more than one take. You could have done a live performance and just shut CU's and cut aways, and then done another for the high and wide shots. You can't see well enough on those that sync would not be critical. Having worked with classical musicians a few times I bet their performance times are with in a second or so for the whole piece so you wouldn't even need to have them fake it because they will play at almost exactly the same speed each take.

I was recording performances of a group on a tour and they hit a 20 minute piece with in two seconds EVERY time.
 
Just watched this flashmob-video. How did they record the music in this live-video? I can't see any mics. Is the sound fake, and the music/atmos is placed in post? If that's the case, how did they get the music and the pictures in sync?

https://www.youtube.com/watch?v=GBaHPND2QJg

It's quite obviously a studio recording - the acoustics show that.

The atmosphere is added to make is sound like outside.

Then it's clever editing to match the shots to the recorded music.

Very well done, but the music wasn't recorded live.
 
Not that hard to 'match' takes in that sort of shoot. Just use 2-3 cameras but they MUST record for the FULL take NO stopping. Then just drop each take onto a timeline and choose the one you want to use.
It was MUCH harder to do back in the good old days of tape.
 
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