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59.97 to 29.97 stutter

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Nick Ravich
59.97 to 29.97 stutter
on Jan 15, 2015 at 7:13:43 pm

Hello-

Working in APR LT 29.97 project in FCP7.
Have some markiii shot 720p 59.94 footage that I want to get into that FCP project.
Transcoded the original h264s in MPEG Streamclip to 1080 59.94 (left the frame rate the same) APR LT.
Then batch conformed those files to 29.97 in Cinema Tools.
Motion is smooth and even when I play those conformed files in QT.
But when I drop into FCP bin and play in a sequence, there's a stuttery movement, almost as if screen can't refresh fast enough.
Switched field dominance to "None" in bins. Originally come in with "Odd/Upper", irritating thing that I noticed MPEG does, assigning field dominance when presumably the footage is progressive.
Any ideas on how to smooth out?

Thanks, Nick.


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Dave LaRonde
Re: 59.97 to 29.97 stutter
on Jan 15, 2015 at 7:59:29 pm

Your mistake was conforming them to 29.97. You made them twice as long as they were at 59.94 by conforming. They probably would have been okay at 59.94.

Or to be double-dog sure they would work, you could have changed the frame rate to 29.97 when you transcoded them.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Nick Ravich
Re: 59.97 to 29.97 stutter
on Jan 15, 2015 at 8:49:28 pm

Thanks Dave.
Sorry, should have explained - I shot 59.94 with intention of playing back in a slow motion look in 29.97.
I know I've done that successfully in the past using the same workflow.
Presumably straight up transcoding to 29.97 will kill the slo-mo possibility.
Again, I'm getting the slo mo look in Quick Time player, but not the FCP app.
But maybe there's something I'm not getting?
Nick.


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Dave LaRonde
Re: 59.97 to 29.97 stutter
on Jan 15, 2015 at 9:12:54 pm
Last Edited By Dave LaRonde on Jan 15, 2015 at 9:18:40 pm

Yeah, double and triple-check all frame rates throughout the project. It's the most likely cause for stuttering playback. Could be as minor as a fractional mistake in typing a bad frame rate, e.g. 29.98 instead of 29.97, or 60 instead of 59.94, or 30 instead of 29.97.

Second would be a bad codec for FCP, but you're in ProRes LT. Personally, I would have picked ProRes 422, but that's me.

Third would be you're not used to seeing the slo-mo... but that's moot because the conformed footage looks okay in a viewer.

Fourth MIGHT be that if you have multiple layers playing back in the timeline, your drives (or their connections) can't keep up with the bit rate for playing back multiple streams.

You don't have any sections of the timeline that need rendering, do you?

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Nick Ravich
Re: 59.97 to 29.97 stutter
on Jan 15, 2015 at 9:54:34 pm

Thanks Dave.

You mean check frame rates for all individual clips in the project?
I'm pretty good about converting/transcoding everything to 29.97 but will check.

Playing back clips in a single video track sequence, coming off FW800 external drive, working on an old Mac Pro, Duo Quad Core with 12GB of RAM.

And no, nothing needs to be rendered in that timeline.

Nick.


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Dave LaRonde
Re: 59.97 to 29.97 stutter
on Jan 15, 2015 at 10:55:16 pm

How full is that drive? Weird things begin to happen when drives reach about 80% capacity.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Nick Ravich
Re: 59.97 to 29.97 stutter
on Jan 16, 2015 at 2:05:06 am

About 1 TB left on a 4 TB drive, so don't think that should be an issue.
I do have a lot of 4-5MB 1080+ sized jpegs in the project.
Not in the same sequences/timeline, but def in same project.
I know in past FCP doesn't like a lot on non-1080 frame-sized pics.
Nick


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Dave LaRonde
Re: 59.97 to 29.97 stutter
on Jan 16, 2015 at 4:52:20 pm
Last Edited By Dave LaRonde on Jan 16, 2015 at 11:19:02 pm

Well, there's a revelation. Any stills with dimensions over 4000 pixels in either direction will send FCP into a tailspin. It can't handle them properly.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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