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Play 24p file (IshowU file) on a 23.976 project (FCP)

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Guillaue Chadaillac
Play 24p file (IshowU file) on a 23.976 project (FCP)
on Oct 7, 2010 at 5:13:12 pm

Hi Everyone!
I am having a bit of a hard time with the Software IShowU.
I am trying to make a tutorial with FCP mixing footages of my Canon 7D (in 23.976fps) and footages from IshowU.
It appears that IshowU is not able to provide actual 23.976p but ONLY 24p.

I am therefore forced to mix these 2 formats (23.976 & 24) on my timeline.

What would be the impact of it on my project? audio pitch shifting? video and/or audio playing faster?

Thanks!

Guillaume.


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Dave LaRonde
Re: Play 24p file (IshowU file) on a 23.976 project (FCP)
on Oct 7, 2010 at 5:49:12 pm

What did you capture using iShowU?

[Guillaue Chadaillac] "It appears that IshowU is not able to provide actual 23.976p but ONLY 24p"

....which could actually be 23.976. What frame rate appears in the FCP browseer when you import the footage?

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Guillaue Chadaillac
Re: Play 24p file (IshowU file) on a 23.976 project (FCP)
on Oct 7, 2010 at 6:17:33 pm

Final Cut Pro and Mpeg stream clip both tell me it is 24p and NOT 23.98...


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Dave LaRonde
Re: Play 24p file (IshowU file) on a 23.976 project (FCP)
on Oct 7, 2010 at 6:30:18 pm

Then it's time to conform a COPY of the file to 23.976 in Cinema Tools. Not 23.98. 23.976.

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Guillaue Chadaillac
Re: Play 24p file (IshowU file) on a 23.976 project (FCP)
on Oct 7, 2010 at 7:05:39 pm

Thanks Dave!
Will this have any effect on the speed of my clips and on my audio?


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Guillaue Chadaillac
Re: Play 24p file (IshowU file) on a 23.976 project (FCP)
on Oct 7, 2010 at 7:06:21 pm

Thanks Dave!
Will this have any effect on the speed of my clips and on my audio?


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Dave LaRonde
Re: Play 24p file (IshowU file) on a 23.976 project (FCP)
on Oct 7, 2010 at 7:24:50 pm

You should be okay if the audio is NOT muxed into the video track. Is it video with an audio track, and not originally h.264? You should be good to go.

The audio should be uncompressed, too: no AC3 foolishness.

But still, you should do this to a COPY of the original. Don't leave yourself in a jam if it doesn't work,

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Guillaue Chadaillac
Re: Play 24p file (IshowU file) on a 23.976 project (FCP)
on Oct 7, 2010 at 7:38:07 pm

I tried to use cinematools.
Indeed, I can convert my 24fps to 23.976 fps and FCP is happy with that.
However, my audio got changes to from 48khz to 47.777khz.
Does this mean that I should use the conformed video AND the orginial audio file?

I am using IShowU and recording in prores LT to match the format of my Canon 7d thatI also converted to Prores LT.


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Dave LaRonde
Re: Play 24p file (IshowU file) on a 23.976 project (FCP)
on Oct 7, 2010 at 10:09:20 pm

[Guillaue Chadaillac] "Does this mean that I should use the conformed video AND the orginial audio file?"

The original audio file will be shorter in duration than the conformed video.

You can use Soundtrack Pro's Time Stretch feature (don't forget to look at the time measurement units) on a copy of the original audio to make them match.

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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