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Keying and resolution
I am working in a 720/24p workflow and I would like to shoot some footage that will be keyed. Would you recommend shooting the footage at the 1080/24p setting and down rez to 720/24p for more information? Are there any inherent problems with this workflow, or any additional tips one could give that work well with the hvx? Thank you.
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4 Replies
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I’d shoot in the same format you are editing. I have gotten great keys off 720p24 footage. Make sure the key is nice and even.
Shane
Littlefrog Post
http://www.lfhd.net -
I would shoot 1080/24p for any keying situation. You get a tad more detail, but you get effectively quite lower compression, which gives you a cleaner image to start from.
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Get the most from your DVX camera. The DVX Book and DVX DVD are now available on ebay and at Amazon (https://www.fiftv.com/db) -
Barry,
Aren’t both 720P and 1080P(i) 100mb/s? How do you figure that the 1080/24p footage would have “effectively quite lower compression?” I would think it would have effectively MORE compression… over a larger canvas. But I also know that you’re quite the expert on these things… so I’d just like to understand your conclusion.
Thanks!
Kyle
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You have about 20% more detail in the 1080 picture, but 100% more pixels to record it in. So a lot more bandwidth allocated per pixel.
It’s true that in both 1080 and 720, a 6.7:1 compression ratio is used. But the thing is, in 1080 mode, there’s twice as much bandwidth per frame, but not twice as much detail. So the 1080 mode places a lot less stress on the codec than the 720 mode does. This results in milder compression artifacts etc; it effectively gives you around 80% more bandwidth.
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Get the most from your DVX camera. The DVX Book and DVX DVD are now available on ebay and at Amazon (https://www.fiftv.com/db)
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