Listening on fairly decent monitors there's no difference between the ambience before the end of the song and the applause, that I could detect - but my hearings gone belly up many moons ago, so whatever.

I could not see any mics.
Nothing on booms or stands.
Nothing hung from the ceiling.

Therefore I reckon it was recorded in a separate recording session and the vid was mimed.

I do not believe the vid was mimed. They simply did not use the actual performance recording.

I think it was done "movie style". Probably a main crew and second unit. Basically one camera, many takes, with the second unit doing pickup shots. It was definitely all planned and storyboarded out. You don't see anyone looking at the camera, so they were all basically actors/performers following a script.

And I may be wrong, but it definitely sounds like they had a soundtrack playback that they were just lipsyncing to. If you look closely you can see a few not-so-good lip syncers.

But anyhow, it was a great production. Very nicely done.

Minor Thread Stealing: It reminds me of the Pink Floyd concert video "Delicate Sound of Thunder" (still yet to be released on DVD) one of my favorite concert video productions. Friggin' perfect, you never see a single camera in the entire concert. How they did it was they filmed it over two nights with the band doing the exact same show on both nights. The first night they did all the closeups with the cameras on stage. The second night they filmed all the shots from a distance. And just edited all together into one seamless production. Highly recommended for folks who can appreciate such a great production, plus the band was great too.

Oofta! :-)

...Jerry [who's mother was born in Minnesota]

That's a talented bunch of students for a business school!

There are many videos like that on youtube, they call it improve skits, flash mobs, etc.

Let me link some humourous ones for you guys:







Grocery store musical is my favorite:

I love lunch:

I think its one take, soundtrack is live too. But its been editied in such a way to hide the cameras floating around. But look around 3:33 and when it cuts from the 'security guard' singing to the high up wide shot, you can clearly see the steady cam operator from the previous shot in front of the singers walking through the crowd.
The audio is probably off camera somewhere being recorded live and then synced up in post (plural eyes at a guess) to the footage. Its a good edit, you hardly see the cameras at all.

Paul.

It's a slick bit of audio editing that was done early on in the finished piece..
They did the whole take live.
Then they did a sync recording to the raw video in a studio, probably took them a few takes to get it.
The choir was ordered in a standard BTSA configuration in the studio, and this did not vary. Not at all like the shoot.
In post, the sax was switched to the studio take at exactly :28.
The ambient was faded out around :41.
A nice touch of echo (Acoustic Mirror?) was added to preserve the "live" feeling.
Notice only a few seconds of lip movement was included in the whole video. That's a dead giveaway.
Gap at the end before the applause was too long.
Studio take is terminated at 4:26:175, and applause is initiated at 4:28.175, with precisely two seconds of dead silence in between.
;?)

Well, have to admit, just listening to my laptop speakers here so its hard to tell on the sound side.
But, you have to realise the whole crowd is in on the show and its well rehersed. And at 0:41, the 'crowd' goes quiet because they know they have to. So not sure about that abient being removed.
Sounds like too much trickery for a FlashMob video as they call them. Its not a flashmob at all, its totally rehersed and everyone knows whats coming. It even looks like a public space where people dont know each other, but of couse they do.
Ending applause delay - yes, when they put there hands down, they start to clap. Try claping with both arms up! lol.

But maybe i need to get in the studio and have a proper listen, my laptop speakers are a bit rubbish :(

Paul.

No, the live audio has been faded out completely and the studio track is full up well before the first vocal at 1:08. All of the music from :28 on was recorded and mixed in the studio. It's as obvious as a fly on your nose. Use your earbuds.

haha, check out the join at 0:55 - the fly on the end of my nose just said HELLO.
And yes, the gap at the end, a blatent drop in.

Yeah, got it now.


Paul.