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60p or 30p out to D5 for Chroma Key and Compositing
Okay, riddle me this.
We have a green screen shoot coming up next week, shooting varicam and would like to go straight to D5, we have a D5 deck in house and this will help avoid a later 1700 deck rental and dub costs. I know this isn’t as good as going direct to disk uncompressed 10bit, but D5 is less compressed than DVCProHD so it should gain us a little, right?
I was thinking we should shoot 720p @ 59.94, cut in 59.94 uncompressed 10 bit and composite in After Effects at 59.94. We are finishing to digibeta SD 29.97.
There is no need for true slow-mo with this material, if anything some material will be sped up in post but not slowed down. There will be no over or undercranking done during the shoot as we are capturing to D5 and I don’t believe it will hold the varicam flags.Footage look aside, If our end delivery is SD 30p (29.97), is there anything gained for compositing by shooting 60p vs 30p if there is no need for slow-mo?
The entire spot will be in a graphic environment. I was thinking that we would do all post at 60p to help avoid any interlacing issues when we down-convert to SD 29.97 via Kona 3. Is this overkill? Would we be okay shotting 30p?
Considering footage look, if we do shoot and post in 60p and then output to 30p, will the 30p output start to look like 30p shot off the camera?…ie: throw away the extra frames? or will it still be ultra smooth 60p look.
Any feedback is greatly appreciated…..Gary if you’re out there I’d love to hear what you think. I know you deal with this question often.
cheers,
Ted -
3 Replies
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[griffisart] “Footage look aside, If our end delivery is SD 30p (29.97), is there anything gained for compositing by shooting 60p vs 30p if there is no need for slow-mo? “
You would have less motion blur to deal with (depending on shutter speed).
[griffisart] “Considering footage look, if we do shoot and post in 60p and then output to 30p, will the 30p output start to look like 30p shot off the camera?…ie: throw away the extra frames? or will it still be ultra smooth 60p look. “
If you’re going from 60P to 30P, then you’d throw away half of the frames. If you’re doing from 60P to 60i then you’re throwing away half of each frame.
-Russ
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I often shoot chroma keys at 30 fps, but we’ll shutter to 1/100 or 1/120 to get sharper frames in case they want to clean up some individually with less blur!
JS
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Thanks for all your help, very helpful.
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