What Sample Rate to record in during Slow Motion Shoots? (Location Sound Recording)

T

Timli

New member
Hello,

I'm quite new in the whole slow motion area and I was just wondering, for shoots where the DP would be shooting at 50fps or higher, what Sample Rate should I set my Sound Devices 633 to? Should I set it to 96kHz or 192kHz?

Any kind of information would be greatly appreciated.


Cheers

Tim
 
Does the sound also need to be slowed down in post? That seems... unusual. If there's dialog to be slowed down, it may be better to ADR it so that you don't have any environmental/ambient interference at all to artifact. Keep it at 48kHz, 24-bit.

If, for some reason, the audio is also to be slowed down in post, then recording at 96kHz can give a very nice and clean half-speed. For more than 50% reduction, 192kHz may be useful.
 
Hey sorry for not mentioning that part aye. So the shoot I was referring to is about some rugby players, a small drama based shoot but about sports. It's for a Commercial and they want to play with a lot of slow motion within the video. There wont be much dialogue at all, like 1 or 2 lines, everything else is just action etc. And yes the audio may be slowed down during post, depending on how they want to sound design it.


Tim
 
Audio and slomo video very rarely go together..... Try this for yourself, try and recording something and slow it to 1/2 speed and see what it sounds like then try 1/4 speed and why not take it further to 1/10 speed.

If you did try and sync them you will need to allow for the delay in the audio due to the speed of sound v speed of light, normally there is no problem but slowed down it will.
 
Oz is right, slowed down sound pretty much never sounds the way people think it will. Which is why it is always created in post. That said you should shoot at a higher sample rate since some of it might be really useful, as a reference or the first layer. Anything slower than half speed with sound and it will be totally unrecognizable so you probably don't need to go higher than 96 but I would talk to sound post if you can and find out what they would like. If you can't talk to them I would probably err on the high side and go 192 because post is going to be doing a lot of messing around so...

In your case, for instance, there won't be any "impact" left when slowed down so kicks will sound very soft. If nothing else they are going to want to add a layer or two of impacty sounds for kicks and foot steps etc.
 
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