FORUMS: list search recent posts

Live green screen with motion effects

COW Forums : Cinematography

<< PREVIOUS   •   VIEW ALL   •   PRINT   •   NEXT >>
Mark Bowen
Live green screen with motion effects
on Jul 15, 2012 at 11:45:54 pm

Hi All,

I'm after a little help with green screen technology. I can do a live green screen video using either wirecast or backdrop.tv but the are limited to what effects they can do...

If you have been to harry potter @ warner you can sit on a broom and on the screen you appear to fly (live) moving side to side and also fowards and backwards as you fly in/out of shot etc....

that is the kind of thing i am looking for but struggling to find out how to do it live on pc based software.

This is something like what i'm after doing.... but need to know how they get it to move around like they do and to show it live?







any help/advise is greatly appreciated


Return to posts index

Mark Suszko
Re: Live green screen with motion effects
on Jul 16, 2012 at 1:33:43 pm

Without a motorized motion platform, you have to do this all in the video environment.

That's a DVE move, some rotation plus x-y moves, more or less synched to a video playback and live compositied in greenscreen. The easiest way I can think of to do the greenscreen and the motion you want in one package is to get a Video Toaster or Tricaster, use A pre-programmed move you can trigger once and replay, to get the swishing movement, and the DDR in the toaster/tricaster will repeat the same pre-recorded clip so the motions should all more or less stay in synch.


There are other ways to do this but the Toaster or tricaster is the first one I can think of that can do this all in one box, in a pre-programmed, repeatable fashion. You might be able to rent one for the duration of the project.


Return to posts index

Mark Bowen
Re: Live green screen with motion effects
on Jul 16, 2012 at 10:17:02 pm

Hi Thanks for the info.

I've had a look and it seams like a cool piece of kit.

At the moment it is for some R&D for future to offer for our clients (tourism photography). Is there another option that is more software based as if it goes ahead it will be something we will buy but dont think the bosses would like me buying/hiring such expensive kit.

I was hoping for more of a software solution (if possible) that can be run on a pc as the tricaster could add approx 7k capex to each site

thanks


Return to posts index


Mark Suszko
Re: Live green screen with motion effects
on Jul 17, 2012 at 7:21:13 pm

If it doesn't have to be live, you could do it in anything from Apple Motion to Aftereffects, etc. on a mac or PC laptop, with great results, and a turn-around time of as little as maybe an hour. If you want these effects live, they come at a cost. The green screen can be done cheaply live with a thousand-dollar-or-less switcher. But adding in the complex motion simulation of the banking and swooping complicates it. I suppose you could mount your camera in a rig and do all that rolling with the camera, by hand, but it would take a skilled shooter with excellent consistency to match the camera moves to the pre-recorded moving background, for something like the broom dodging around obstacles. I can't think off-hand of anything cheaper that would do the job right, and do it live. And... if you can't afforrd to do it right, ....perhaps you shouldn't be doing it.


Return to posts index

<< PREVIOUS   •   VIEW ALL   •   PRINT   •   NEXT >>
© 2017 CreativeCOW.net All Rights Reserved
[TOP]