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What to capture in for green screen work.
I’m using Avid Media Composer v3.1.1 with an Avid Mojo. I’m doing shoots on a green screen and using the spectra matte keyer to remove the background. I’m shooting everything on BetaSP and my Beta deck is connected via component. What resolution should I be capturing my green screen work in? I’m doing it at 10bit 1:1 only because I believe it will give me the most information to do my compositing work. Is this true? Does it make any difference using that versus my normal capture resolution of DV50? Or should I be using a different resolution altogether?
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5 Replies
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I’d bring it in at 1:1. I believe Beta is basically a 2:1 or 3:1 compression, but if you bring it in at 1:1 you know you aren’t possibly recompressing it anymore. DV50 is nice because it preserves the 4:2:2 color from Beta, but it’s about a 3:1 compression I believe. So 1:1, while a bigger file size, at least isn’t compressing it anymore.
As far as 10-bit goes, Beta is only 8-bit I think so you really aren’t gaining anything there. The only advantage is that you have a bigger color space to work in, but it can’t add anything that’s already there. I suggest capturing 1:1 8-bit, trying to pull a key, then recapturing at 10-bit and see if it’s any cleaner. I’m guessing it won’t be.
Michael
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I’ll be working late. -
I agree with Michael, but, based on what your final use for the videos is, I would also try a short sample for comparison at 2:1. The resulting video may not show any significant compression, and the file size difference is notable.
All based on your final destination, useage, etc., of course.
Regards,
Joe Womble
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I get an irriatting aliased line vertically when I key 1:1 beta sp footage. Bringing it in at 2:1 fixes this and never have I seen any artifacts from 2:1.
BTW, betaSP is uncompressed, it’s digibeta that is 2:1.
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So let me ask you this then, since I shoot everything in BetaSP, what resolution should I be capturing in? Drive space is not an issue since I can expand when needed. The tech that setup my system set the default to DV25 411 resolution. It looks awful. I changed it to DV50. But should I be using something else?
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If DV50 looks good and keys well, stick with it. If you want to lighten the compression a bit, go to 2:1 or 1:1. 1:1 will take up a lot of space, and the difference between it and 2:1, visually, is practically imperceptible to the eye.
I’d go with 2:1.
Michael
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I’ll be working late.
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