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Capture live from one machine to another

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Al Sinclair
Capture live from one machine to another
on Jan 9, 2012 at 10:58:22 pm

Hi all,

Here's a stumper:

Can you capture live output from one FCP machine to another?

Here's what we're trying to achieve...

We have a job coming up in a few weeks where we'd like to scrub through footage (it's a stop motion job) and use the natural motion of the scrubbing to speed up / slow down the action. The aim is to get a natural feel to the motion rather than keyframing it. It sounds like a convoluted method, but let's just say it's something we'd like to try.

We'd be aiming to play out ProRes 4444 via HD-SDI (AJA/Blackmagic) and hook it into the input of another AJA/Blackmagic box.

We'd be looking at a pretty (very) fast drive to get smooth motion I guess, but our big unknown is whether there'll be hiccups with lack of timecode or sync issues or any other pitfalls we haven't thought of.

Does anyone know if it is feasible?

Thanks in advance,

Al



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Chris Tompkins
Re: Capture live from one machine to another
on Jan 9, 2012 at 11:29:03 pm

Yes, you can do it. Turn off Machine Control on the recording machine.

Chris Tompkins
Video Atlanta LLC


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Chris Tompkins
Re: Capture live from one machine to another
on Jan 9, 2012 at 11:29:55 pm

As for the scrubbing while recording, I don't know, I would guess no.

Chris Tompkins
Video Atlanta LLC


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Dave LaRonde
Re: Capture live from one machine to another
on Jan 9, 2012 at 11:32:13 pm

Wouldn't it be possible to use Capture Now on the record machine?

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


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Al Sinclair
Re: Capture live from one machine to another
on Jan 9, 2012 at 11:35:14 pm

Hi Chris,

Thanks for your response...

We'd be scrubbing on one machine and capturing "now" on the other machine. So not scrubbing and recording on one machine at the same time.



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Chris Tompkins
Re: Capture live from one machine to another
on Jan 9, 2012 at 11:37:42 pm

No, I get it, Realtime no issues, It's when you scrub the Play machine, that the record machine might freak b/c it wants to "lock" every frame coming over SDI...

I have recorded from one NLE to another on occasion w/o issue. I have not tried the scrubbing you mention.

Let us know how it goes.

Chris Tompkins
Video Atlanta LLC


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Al Sinclair
Re: Capture live from one machine to another
on Jan 9, 2012 at 11:41:45 pm

Ah yes - I'm with you.

That's the kind of worry I had. But encouraging that you've had success before with a different setup.



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Michael Gissing
Re: Capture live from one machine to another
on Jan 10, 2012 at 12:03:59 am

The SDI output will be at the frame rate determined by the Easy Setup so regardless of scrubbing, the output remains fixed frame rate so it will record correctly on the second machine via SDI.

Because you are scrubbing, timecode is irrelevant, so capture now, uncontrolled device will work.


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Bret Williams
Re: Capture live from one machine to another
on Jan 10, 2012 at 3:18:28 am

Reminds me of 1993 - VideoCube 1.0. It had no way of creating slowmo, so we captured it off the betacam sp with dynamic tracking right into the system. It was an art getting your ramp up/down just right.


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Al Sinclair
Re: Capture live from one machine to another
on Jan 10, 2012 at 6:54:34 am

Thanks for all the responses...

It's sounding pretty likely that we can achieve what we're after. My next question is this:

What would you think is the most effective way of achieving this? ...remembering that we don't want to lose quality from the original ProRes 4444...

In my head I've been thinking "scrub in FCP, capture in FCP" - using 2x capture units. Maybe there's a different way? Is there any other software that'll scrub smoothly and offer 4444 output?

I've only just thought of that, so will go do some research.

Thanks again everyone!



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Chris Tompkins
Re: Capture live from one machine to another
on Jan 10, 2012 at 11:00:53 am

Create the effect you're after in AE?

Chris Tompkins
Video Atlanta LLC


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Al Sinclair
Re: Capture live from one machine to another
on Jan 10, 2012 at 11:07:53 am

Yup, that's definitely one option... And it's our fallback really. Or Twixtor in FCP, but that's a bit slow and rendery for my liking.

The director really wants to get that human feel in the motion.

It's something I've been talking myself in and out of for the last couple of weeks.



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Mark Suszko
Re: Capture live from one machine to another
on Jan 10, 2012 at 3:25:08 pm

Another way to do this might be to apply a screen recorder program to the same computer where you're doing the timeline scrubbing. I don't know if it will get the kind of resolution you want, though.

I know the effect you're going for, I did something similar a long time ago with some keyframed animation of a talking cow I did in Lightwave. I was able to "puppeteer" the output by hand-scrubbing along the timeline to get a more organic kind of motion, and in my Discreet Edit*6 days, once did some of this "DJ-scratching" kind of timeline scrubbing, while recording to DVC Pro via SDI. Then I would re-import that footage thru SDI back into my timeline for further manipulation.


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Matt Hall
Re: Capture live from one machine to another
on Mar 12, 2012 at 2:20:29 pm

old topic - but wanted to give another technique: using a screencap program to capture final cut as you scrub. i do this often and it works great. i use screenflow http://www.telestream.net/screen-flow/overview-m.htm


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Graham Spice
Re: Capture live from one machine to another
on Sep 1, 2012 at 7:00:53 pm

+1 for Screenflow - fantastic program


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