Sound and Slow motion

[AndreasOberg]

How do you guys deal with sound when we are recording slow motion?

I'm recording a lot of slow motion, sometimes I will even play it back in real time. However this means I loose the scratch track on the Epic so I get no sound at all.

Any thoughts would be good to hear.
/Andreas

 

[Ben Scott]

Unless I am missing something very obvious here wouldn't the best thing be to just use a slate or mini slate and sync separately recorded audio to the visual of the slate closing?

 

[Ulf Krentz]

You also might consider to set your project frame rate to match your recording frame rate. This way you will be able to record sound.
HTH.

Cheers!

 

[AndreasOberg]

Yes synching to the slate is the way that I have done so far.
But is there all there is to it? I could imagine recording in a higher frequency for example so that the sound will survive being stretched more to slower speeds, but I have little practical experience. I could also imagine that we will later rebuild the audio by hand to make it sound exactly like we want to for the slow motion sequences.

Any more ideas are always welcome of course
/Andreas

 

[AndreasOberg]

You also might consider to set your project frame rate to match your recording frame rate. This way you will be able to record sound.
HTH.

Cheers!

Really, that is a great idea? But scary if I forget to change it back!
Thanks for the tip.
/Andreas

 

[Ulf Krentz]

Andreas, just look at your audio levels, they don´t show up when out of sync but show varispeed instead.

Cheers, Ulf

 

[Christopher Mills]

Record to another device, if you want some non synch sound of the event you are recording.
Do use a snap slate, in case you want to slow down your sound and 'sync' it. (quotes are due to my opinion that you may not get complete accuracy on this method)

 

[Jordan Buck]

Pretty sure project frame rates only allow you up to 60fps but would have to double check - but either way if that was left on you could just conform the clips anyway.

Are you planning on shooting above 60? The best way around it is to slate and sync.

 

[AndreasOberg]

Yea mostly I go up higher to 100 - 200 fps so I guess we will slate it and synch manually then. Does timecode work good for synching when you have slow motion?
Cheers!
/Andreas

 

[ericyoung]

Yea mostly I go up higher to 100 - 200 fps so I guess we will slate it and synch manually then. Does timecode work good for synching when you have slow motion?
Cheers!
/Andreas

The first frame will match, but after that the TC necessarily increments with each frame of picture and won't match audio. There may also then be duplicate TCs too, but Clipnames will be unique.

 

[D Fuller]

This seems like an odd thing to want to do, really. I mean, I get the desire to know the start points sync, but slow motion sound seems odd to me. Could you tell us more about how you'd use it?

 

[Daniel Kelly Brown]

Pretty sure project frame rates only allow you up to 60fps but would have to double check - but either way if that was left on you could just conform the clips anyway.

Are you planning on shooting above 60? The best way around it is to slate and sync.

Been trying to find good ways to record sound at high frame rates also. I can confirm that 60fps is as high as the epic allows you to set your project frame rate. For higher then 60fps frame rates and in/on camera recording I am considering picking up this device: http://www.amazon.com/gp/product/B00DU66WXU/ref=ox_sc_sfl_title_8?ie=UTF8&psc=1&smid=ATVPDKIKX0DER

 

[Björn Benckert]

I love the new Iphone 100fps with slomo audio it sound so cool. We been sitting dropping pencils bouncing in macro in front of the iphone for hours just to see / hear that nice 100fps sound.

RED please make some small scratch mic's that can be used like the iphone / at any speed.

 

[ericyoung]

This seems like an odd thing to want to do, really. I mean, I get the desire to know the start points sync, but slow motion sound seems odd to me. Could you tell us more about how you'd use it?

Like Bjorn says, if you could get supersampled audio to go with your pictures it sounds cool AND matches perfectly. Also you could ramp it without artifacts.

 

[Daniel Kelly Brown]

I love the new Iphone 100fps with slomo audio it sound so cool. We been sitting dropping pencils bouncing in macro in front of the iphone for hours just to see / hear that nice 100fps sound.

RED please make some small scratch mic's that can be used like the iphone / at any speed.

Noticed the iPhone slomo sound as well, such a cool feature. I would also be very grateful if red would create a small scratch mic that could be used at any speed.

 

[D Fuller]

Like Bjorn says, if you could get supersampled audio to go with your pictures it sounds cool AND matches perfectly. Also you could ramp it without artifacts.

Interesting.

 

[AndreasOberg]

Hi Fuller,
Yes an equivalent to the iPhone but with higher quality is what I'm requesting. Actually I'm not sure what I'm requesting because I haven't dealt with sound in slow motion before.
I'm coming from computer games and there we can normally deal with it fairly "easy" we slow the simulation time and then all the sound effects (and the effects on top of them) are played back slower.

What I do know is that I would like to have sound when I have recorded video in slow motion so the question is how to best approach it.
It sounds like one way of doing it would be to record with a separate recorder with as high frequency as possible maybe if audio is recorded in 192kHz then it will work better to stretch out (4 times at least).
Perfect would of course be if this was then put together with the video and then you can do any speed ram in your NLE and the sound speed will change just as in the iPhone.

Best
/Andreas

 

[Marc Wielage]

How do you guys deal with sound when we are recording slow motion?

I think the best way to do it is to hire a location sound mixer, explain the problem, and have them record at a high sample & bit rate -- probably 192kHz / 24-bit -- with very high quality microphones at an optimum distance from the subject.

Once it's recorded, get a post sound effects editor to sync up the material in Pro Tools with your picture and come up with the proper varispeed rate at which the sound will more or less match the picture. This is done all the time, though typically it's for short segments, maybe :30-:40 seconds or so.

I would advise shooting a test beforehand and shooting & recording a physical clap at the head and a clap at the tail to aid in syncing. This will give the sound effects person an exact varispeed rate at which to process the material. You'll definitely need the high sampling rate for the sound material to be slowed down to this degree.

Under no circumstances would I recommend recording sound in camera, especially in situations like this.