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HD 25fps - 29.97fps frame rate best conversion

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HD 25fps - 29.97fps frame rate best conversion
by PETER LEE-JONES on May 29, 2008 at 10:03:19 pm

Hi CC FCP,

What are the best settings to convert HDCAM footage from 25 to 29.97 fps using Compressor. Should I use frame blending?

What happens to the sound? Does it need stretching in ProTools

Pete


FCP since 2003 -- G5 w/ Blackmagic Decklink HD

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Re: HD 25fps - 29.97fps frame rate best conversion
by Chris Borjis on May 29, 2008 at 11:41:55 pm


BETTER (motion compensated)
with the setting below it set for 100% of original


Best will take a lifetime and not look any different.



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Re: HD 25fps - 29.97fps frame rate best conversion
by Sean ONeil on May 30, 2008 at 2:49:09 am

Have you considered just conforming it to 23.98 in Cinema Tools?

Sean

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Re: HD 25fps - 29.97fps frame rate best conversion
by PETER LEE-JONES on May 30, 2008 at 8:46:30 am

Why would I want to go to 23.98?

My delivery format is 29.97

FCP since 2003 -- G5 w/ Blackmagic Decklink HD

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Re: HD 25fps - 29.97fps frame rate best conversion
by gary adcock on May 30, 2008 at 11:44:25 am

[PETER LEE-JONES] "Why would I want to go to 23.98?
My delivery format is 29.97 "


Because that is the standard method for converting between the NTSC and PAL frame rates.

by conforming the the clip in CT to 23.98, and then adding pulldown to get your output to 29.97- you can achieve the conversion. It will not be as accurate as going through a teranex, but it does work.




gary adcock
Studio37
HD & Film Consultation
Post and Production Workflows
Inside look at the IoHD




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Re: HD 25fps - 29.97fps frame rate best conversion
by Peter Lee-Jones on May 30, 2008 at 12:16:35 pm

interesting I will try that

FCP since 2003 -- G5 w/ Blackmagic Decklink HD

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Re: HD 25fps - 29.97fps frame rate best conversion
by Matthew Nelson on May 30, 2008 at 5:41:46 pm

There is a caveat to the 25 to 23.98 conform process. Your TRT will grow by 4% and your audio with shift in pitch.

A quick way to pitch correct the audio is to conform the video, note the new TRT. Take the 25fps audio into soundtrack and use the time stretch process. Enter in the new TRT, render and output.

Matt



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Re: HD 25fps - 29.97fps frame rate best conversion
by Peter Lee-Jones on May 30, 2008 at 6:14:31 pm

We found a good way to do this.

Playout the program as 25p

then convert the SRW5500 to 29.97

then digitise into FCP 29.97 and time stretch the picture at 83.33%
Our films are only

the reason for this is we have Dolby surround sound which must not be corrupted.

Then master onto SRW5500





FCP since 2003 -- G5 w/ Blackmagic Decklink HD

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Re: HD 25fps - 29.97fps frame rate best conversion
by gary adcock on May 30, 2008 at 7:59:42 pm

[Peter Lee-Jones] "the reason for this is we have Dolby surround sound which must not be corrupted. "

I am going to bet FCP tears it up....

just a guess





gary adcock
Studio37
HD & Film Consultation
Post and Production Workflows
Inside look at the IoHD




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Re: HD 25fps - 29.97fps frame rate best conversion
by Matthew Nelson on May 30, 2008 at 8:08:07 pm

I believe that the 5500 can playout 25 as 23.98 and pitch correct the audio at the same time. But what that would do to your audio encode I do not know.

If you found something that works go with it.

Matt



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