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Multiple frame rates

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james Lackleter
Multiple frame rates
on Jan 21, 2014 at 11:17:47 am

The film I'm editing has one scene that was shot in 24fps, along with audio recorded in 24 fps. The rest is in 23.98 fps... I have never encountered this. I can't change the audio to 23.98 seconds as it's too distorted as a result. Any suggestions as how to deal with this.


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John Fishback
Re: Multiple frame rates
on Jan 21, 2014 at 4:12:11 pm

Try Wave Agent, a free download from Sound Devices. It allows you reset the t/c of an audio file.

John

MacPro 8-core 2.8GHz, 16 GB RAM, OS 10.8.4, QT10.1, Kona 3, Dual Cinema 23, ATI Radeon HD 5870, 24" TV-Logic Monitor, ATTO ExpressSAS R380 RAID Adapter, PDE enclosure with 8-drive 6TB RAID 5
FCS 3 (FCP 7.0.3, Motion 4.0.3, Comp 3.5.3, DVDSP 4.2.2, Color 1.5.3)
FCP-X 10.0.9, Motion 5.0.7, Compressor 4.0.7

Pro Tools HD 10 w SYNC IO & 192 Digital I/O, Yamaha DM1000, Millennia Media HV-3C, Neumann U87, Schoeps Mk41 mics, Genelec DSP Monitors, Prima CDQ120 ISDN


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james Lackleter
Re: Multiple frame rates
on Jan 21, 2014 at 4:21:49 pm

Thanks John, I'll give it a whirl, I just changed the rate in compressor last time. I did lower the actual compression on the on the clip and that took some distortion away, so hoping this kills it completely.

Little confused why they would shoot with different frame rates though, maybe different DP or something.


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Jeremy Garchow
Re: Multiple frame rates
on Jan 21, 2014 at 8:23:17 pm

One second of audio is one second of audio. Audio has no frame rate, only sample rates.

Your 23.98 audio should match the 24.0 picture. If you need to make your 24.0 sources 23.98, then slowing down the video is easy, but the audio is more difficult if you need to match the audio to the now slowed down video.

isotope makes a good one. http://www.izotope.com/products/audio/rx/

There are others.

Compressor will not do a good job with the audio.

Are you sure your sources are 24.0?

Jeremy


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james Lackleter
Re: Multiple frame rates
on Jan 22, 2014 at 12:01:06 am

Yes technically I guess you're correct. Entering a frame rate in the mixer is for length duration. Correct me if I'm wrong. I have however fixed the issue thanks guys, I corrected the pitch which was pretty subtle. But I'm curious how is that program able to perceive what frame rate the audio signal was recorded in.


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Jeremy Garchow
Re: Multiple frame rates
on Jan 22, 2014 at 12:04:50 am

[james Lackleter] "But I'm curious how is that program able to perceive what frame rate the audio signal was recorded in."

It has a tc rate of 23.98 (or 24), not a frame rate.

It is metadata.


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John Fishback
Re: Multiple frame rates
on Jan 22, 2014 at 12:20:01 am

Wave Agent, free from Sound Devices, allows you to change that metadata in the audio file. I've used it once or twice to change audio t/c that was entered incorrectly during a shoot.

John

MacPro 8-core 2.8GHz, 16 GB RAM, OS 10.8.4, QT10.1, Kona 3, Dual Cinema 23, ATI Radeon HD 5870, 24" TV-Logic Monitor, ATTO ExpressSAS R380 RAID Adapter, PDE enclosure with 8-drive 6TB RAID 5
FCS 3 (FCP 7.0.3, Motion 4.0.3, Comp 3.5.3, DVDSP 4.2.2, Color 1.5.3)
FCP-X 10.0.9, Motion 5.0.7, Compressor 4.0.7

Pro Tools HD 10 w SYNC IO & 192 Digital I/O, Yamaha DM1000, Millennia Media HV-3C, Neumann U87, Schoeps Mk41 mics, Genelec DSP Monitors, Prima CDQ120 ISDN


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Oliver Peters
Re: Multiple frame rates
on Jan 22, 2014 at 12:53:28 am

I replied to the same question here:

http://forums.creativecow.net/readpost/335/64880

- Oliver

Oliver Peters Post Production Services, LLC
Orlando, FL
http://www.oliverpeters.com


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james Lackleter
Re: Multiple frame rates
on Jan 22, 2014 at 8:09:34 am

That's useful information, I didn't know the audio actually kept TC in it's metadata. Interesting. Thanks everyone. And Oliver the show with a mixed frame rate is something my friends did. It's pretty cool, some scenes in 24fps, some scenes are in 48 fps. I'll send it if you'd like.


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Oliver Peters
Re: Multiple frame rates
on Jan 22, 2014 at 1:12:25 pm

No need to send anything, but thanks. How would the projector handle that? I presume there's one common base rate, for example everything at 48 (I'm assuming real time and not slomo). Then the 24fps scenes would be played with a 2:2 cadence.

Oliver

Oliver Peters Post Production Services, LLC
Orlando, FL
http://www.oliverpeters.com


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