I have that kind of problem: I have video footage of TV Show on the green screen. TV Show have 8 camera positions (we call them "plans"). In the footage all plans goes randomly and a lot of times. I need to add for every plan individual background and individual keying properties.
The question is: Is there any way to automate all this actions?
Technically it shouldn't be very difficult to trace every plan, because on each of them on the screen is special people silhouette. But is there any way to do this? Or should use any other software or add-ons?
If I understand correctly your issue, you could create a precomp with a colored solid for each of the 8 cameras to match in 3d the position of your background. Once you're done, you can just replace the solid with any new background plate you need or open the precomp and animate inside a change between multiple background plates.
Yep, I doing like it right now. But I speaking about different thing: my footage have several hundreds plan changes. Make it manually — really long work. If there is some plugin to automatically trace change of the plan in my footage?
As for automatically placing the correct background on each shot -- that's actually very complicated. If you could come up with certain patterns of pixels that are always green or always not green for each of the specific camera angles, you could use a series of expressions that sample the image and adjust the opacity of each background accordingly.
I'd suspect it'll take a lot longer to get this right than it will to just manually identify the shots. Consider using layer colors or maybe Zorro the Layer Tagger [link] to help you sort your shots.
Alternately, separate the shots onto separate tracks in Premiere and send them to AE one track at a time.
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