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Keying Options
I have some footage that I need to key that was taped using the Panasonic VariCam in 720p 59.94. I will be capturing this footage using the Panasonic DVCPro HD1200 Deck. If I capture in 720p, it will give me a cleaner key, correct?
I will be compositing this footage with 1080i and maybe even some SD footage. Now, I am dealing with different frame rates. I know FCP6 has a mixed format timeline, but I want and most likely need to, use AE CS3 for most of my compositing. In the end, the final output will end up being 1080i, but I could also go with 720p and upconvert through hardware.
I am looking for the best way to mix different frame rate footage in AE? Or should I just capture my footage to be keyed in 1080i, so I have all the same frame rates?
In the past when I used 720p and put it in a 29.97 fps timeline I get extra frames..?
Just in case you want to know I am using:
Mac Pro
Quad-Core Intel Xeon
3 GHz
Memory: 8 GB
Bus Speed: 1.33 GHz -
1 Reply
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you could probably get a lot of different answers for this one…
but i agree with 720p60 for keying. you will have an easier time keying the 720p and should get cleaner keys. if you do this often, you may want to get third party scaling software/effects to up-rez the 720 to 1080, but ae should be able to do a decent job and you’ll want to output your 720p60 to 1080i30 from ae either after you pull the key or when you composite it with the 1080i30.
i think you’d be better off this route, than de-interlacing the 1080i30 to scale to 720p60. however the image quality should holdup pretty well, so if you notice you are having problems with scaling up the 720p after the key, it might be a better way to go. it kind of comes down to the footage and how clean you are able to get the key (remember the image will get interlaced in the end, so some edge problems probably won’t be noticeable after that)…
as far as up-rezing sd to hd, there are several thrid party effects that have better scaling algorithms than ae. but if you have hardware that can up-rez at capture, that may be a better way to go. have you thought about how to handle the aspect ratio difference? or is the sd already widescreen.
Kevin Camp
Designer – KCPQ, KMYQ & KRCW
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