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Pro Res: dropped frames on capture
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 -
9 Replies
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Not a problem and glad to help.
How fast is your drive array?
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It’s a 6 drive SATA RAID 0. Not super fast.
Michael Rothenberg
Peak Productions -
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 4×4 files (they support an alpha). You can playback ProRes, but capturing is not possible.
Jeremy
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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 -
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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Plugging in DVCPRO-HD 1080i60 & 1 GB file size as parameters, I get:
Write: 223 MB/s
Read: 226 MB/sMichael Rothenberg
Peak Productions -
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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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 -
[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 4×4 files with alpha.
Jeremy
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