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Pro Res: dropped frames on capture

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Michael Rothenberg
Pro Res: dropped frames on capture
on Oct 27, 2009 at 2:47:52 pm

For another user in this forum, Jeremy posted the following:

The reason why I said DVCPro HD for an 'offline' codec and not ProRes on your system is because you have a PowerPC dual 2.0 G5. If you had an intel machine, I would most definitely say use ProRes. Since ProRes is a pretty processor intense codec, capturing ProRes requires an intel machine.

Thank you for this. I lost a day trying to figure out what was wrong with my settings! (I also have a PPC dual proc G5.) Now I know I was attempting the impossible.

My followup question is this: I've captured in DVCPRO-HD (1080i), but many AE graphics will be added to my cut later. What workflow would you suggest? Here are the options we're considering:

1 - AE artist gives me elements w/ alpha channel (Animation codec). I render in DVCPRO-HD.

2 - I export a Pro Res version and give it to him; all the rendering gets done in After Effects.

Is there a better option? In the past I haven't found DVCPRO-HD to be a good post production codec.

Thanks much - and thanks for your other post reassuring me about mixing 720/30P and 720/30PN (different project).

Michael

Michael Rothenberg
Peak Productions


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Jeremy Garchow
Re: Pro Res: dropped frames on capture
on Oct 27, 2009 at 3:33:13 pm

Not a problem and glad to help.

How fast is your drive array?



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Michael Rothenberg
Re: Pro Res: dropped frames on capture
on Oct 27, 2009 at 3:40:54 pm

It's a 6 drive SATA RAID 0. Not super fast.


Michael Rothenberg
Peak Productions


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Jeremy Garchow
Re: Pro Res: dropped frames on capture
on Oct 27, 2009 at 3:46:35 pm

Yeah, but that should be enough to handle 720p30 a 10bit UC.

I would recapture those shot to 10bit UC and have your AE artiist send you ProRes 4x4 files (they support an alpha). You can playback ProRes, but capturing is not possible.

Jeremy


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Michael Rothenberg
Re: Pro Res: dropped frames on capture
on Oct 27, 2009 at 3:54:25 pm

Oops, I was afraid I would confuse things with my reference to 720.

The project I'm asking about now (sorry about that) is 1080i/29.97. Can I still use 10 bit UC for that?

Michael Rothenberg
Peak Productions


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Jeremy Garchow
Re: Pro Res: dropped frames on capture
on Oct 27, 2009 at 4:01:11 pm

No, sorry. My mistake, I missed it.

Run the AJA System Test and tell me how fast your array is running.

It's in the AJA Utilities folder in your Applications.


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Michael Rothenberg
Re: Pro Res: dropped frames on capture
on Oct 27, 2009 at 4:24:36 pm

Plugging in DVCPRO-HD 1080i60 & 1 GB file size as parameters, I get:

Write: 223 MB/s
Read: 226 MB/s


Michael Rothenberg
Peak Productions


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Jeremy Garchow
Re: Pro Res: dropped frames on capture
on Oct 27, 2009 at 4:29:48 pm

Yeah, that's just fast enough for 10bit UC 1080i. Give a small clip a shot and see if it's possible.

Jeremy


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Michael Rothenberg
Re: Pro Res: dropped frames on capture
on Oct 27, 2009 at 4:44:17 pm

I don't have the deck here right now, but I will in a day or so and will test it then. At that point I'll just be batch capturing the final approved piece (I hope). Thanks so much for the advice - it's like having you here in the room.

Are you OK with my picking up this thread in a day or so if I run into problems with the 10 bit UC capture? Or maybe a better way of putting it is... if I do run into problems, what should my fallback position be?

Thanks again Jeremy.

Michael Rothenberg
Peak Productions


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Jeremy Garchow
Re: Pro Res: dropped frames on capture
on Oct 27, 2009 at 4:52:11 pm

[Michael Rothenberg] "Are you OK with my picking up this thread in a day or so if I run into problems with the 10 bit UC capture?"

Of course, just post back.

[Michael Rothenberg] "Or maybe a better way of putting it is... if I do run into problems, what should my fallback position be? "

Just send the DVCPro HD files, and have your animator export ProRes 4x4 files with alpha.

Jeremy


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