Workflow for interop DCP with a 23.976 to 24.000 conversion?

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Seth Goldin

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Workflow for interop DCP with a 23.976 to 24.000 conversion?

PostMon Sep 17, 2018 4:12 am

Was considering authoring an interop DCP last week, but the mezzanine file was mastered at 23.976 FPS.

I’ve read that Resolve 15 will take care of the conversion from 23.976 to 24.000, but I’m curious as to exactly how it does it. Does it take all the frames and speed up audio and video 100.1%? Does it correct the pitch when speeding up the audio?

I’m wondering what the proper workflow for something like this is. Specifically:
1. What’s the proper way to convert the video track from 23.976 to 24.000? If Resolve’s DCP encoder doesn’t take care of this, how should it be done?
2. Similarly for audio, does audio that had been mastered at 23.976 need to be sped up 100.1% with pitch correction or does Resolve leave the audio untouched?


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Krishna Pada

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Re: Workflow for interop DCP with a 23.976 to 24.000 convers

PostMon Sep 17, 2018 5:53 am

Transferring from 25 to 24 makes pitch correction necessary.

For 23.976 to 24, the shift in pitch is so minute that it's imperceptible.

But it's a good theoretical question though, what does Resolve do in this case?
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David Jahns

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Re: Workflow for interop DCP with a 23.976 to 24.000 convers

PostTue Jan 22, 2019 12:29 am

Any follow up to this? I am in the same boat. Film shot and edited at 23.98 - planning to make a DCP straight from Resolve Deliver page.

I’ve exported w both Interop and non-interop settings, and both created DCPs at 24.0 fps, and audio appears to be perfectly in sync after 85 minutes on both DCPs, so I would imagine the software is smart enough to to the 0.1% speed change during the encode.

But it would be nice to see confirmation or clarification of how it works. And why the hell didn’t SMPTE include 23.976 in the acceptable frame rates for DCPs? Why do we have this crazy dance to do for every feature length film - it’s pretty ridiculous... Although I guess if DR15 handles it for us, that’s about as painless as it can get - we don’t need the audio house to deliver both speeds anymore? I’ll take that as a win...
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Vit Reiter

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Re: Workflow for interop DCP with a 23.976 to 24.000 convers

PostTue Jan 22, 2019 10:43 am

DaVinci unfortunately doesn't do good sound quality after time stretching. Its sound after time stretching has audible phasing.

Use the proven time stretching systems: Zynaptiq Time Factory II, iZotope Radius, Serato Pitch 'n Time, ProTools DAW.
DaVinci Resolve 18.6.6 Studio (macOS Monterey 12.7.4)
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Andrew Kolakowski

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Re: Workflow for interop DCP with a 23.976 to 24.000 convers

PostTue Jan 22, 2019 10:57 am

Those mentioned apps are good, but for 23.976 to 24 stay away from pitch correction. It'll bring more damage to the audio than good things. Sometimes even for 24<->25 it's better not to use pitch correction.
Don't let such a things happen automatically without your control or knowledge what is actually happening behind your eyes. Bad practice.

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