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Multi Cam Green Screen- ATEM1

PostPosted: Fri Mar 15, 2013 4:37 pm
by broadcastvenue
Our production staff was advised we could use the ATEM 1 produce simple cuts only studio programs with different Chroma Key backgrounds (requirement) using the ATEM 1. Can this in fact be done and can anyone put together a quick tutorial for our TDs?
Thanks!

Re: Multi Cam Green Screen- ATEM1

PostPosted: Fri Mar 15, 2013 4:40 pm
by broadcastvenue
To be more precise, we have to key a different background angle behind each camera to look plausible as a green screen set. What is the workflow, (key set up to do so) Thanks

Re: Multi Cam Green Screen- ATEM1

PostPosted: Fri Mar 15, 2013 9:47 pm
by Chad
In theory it should work. The ATEM 1ME has 4 keyers, so you could have up to 4 "angles", and each keyer can be told to turn off/on during the next background transition, so technically it all should work.

However, many users seem to be having a difficult time getting the ATEM's chroma key to work to their liking. I've not used it myself, but apparently getting the settings dialed in can be troublesome, and some users still see some artifacts in the image.

Re: Multi Cam Green Screen- ATEM1

PostPosted: Fri Mar 15, 2013 10:05 pm
by rogersuski
Define simple. Talking heads with how many cameras? How fast is your "directing style"

There's only two media players (stills) so that will affect the "look" unless you bring in a 3rd background via a different source.

With the macro applications - you might be able to pull this off...and get away with only 2 still sources---but would take additional setup.

Personally, I wouldn't want to pull this off even with the 1 M/E panel

Re: Multi Cam Green Screen- ATEM1

PostPosted: Sat Mar 16, 2013 3:44 am
by Mathijs
With 2 shots it can easy be done, with more than 2 it gets complicated because you have only one DVE.
So when using fly to show a big set loaded within media player 1, you can cut to another camera with a close up shot on media player 2 without the DVE.
With more than these 2, you would need a very big screen, plus you need to change the background pictures within the media players on the fly.
Plus the fact that the chroma keyer is not perfect yet, so getting a perfect key is another problem.
Also, putting a desk in front will also be a problem, or you have to input that from an external source.

Re: Multi Cam Green Screen- ATEM1

PostPosted: Sat Mar 16, 2013 1:18 pm
by JohnBengston
broadcastvenue,

A few bits of advice:
  • Light your set, and particularly the green walls, well enough so no shadows are cast on the walls, and the talent / real-set elements don't get any green reflected light from the walls. This will increase your chances of being able to get a good chroma key result.
  • Fixed camera positions, no chance of 3D virtual studio with camera tracking without loads of external hardware.
  • Tune each camera angle to it's own key settings and store those snapshots.
  • Use a JustMacros OnPreview changed event to setup the next transition with the correct key and ME Transition settings, depending on what the operator selects on preview.
  • Always select next camera on preview then auto-transition / cut, to ensure the keys change and you don't end up with the background for camera one, providing the background for camera 2. Hot cutting on TX will not work.

Operationally the workflow should be the same as using none green-screened cameras, you just require a little extra setup during your rehearsals.

You should only ever need two USKs even if you are using 4 cameras, as you are just alternating between the Key providing the background for the camera on TX, and the one providing background for preview. Therefore you can still use the other two USKs and DSKs for individual desk control of graphics layers, or for DVEing a live window into the virtual set.

In the end, how good it will look, depends entirely on the design of your virtual set, and how well you match the camera angles with the rendered backgrounds.

Good Luck, hope you manage to pull it off using the ATEM.

John

Re: Multi Cam Green Screen- ATEM1

PostPosted: Sat Mar 16, 2013 2:11 pm
by Roman Pytkin Pekarek
Or look for old echolab atem.. It have macros, whitch can set everything with one click on controldesk.. We succesfully setuped 3 cams with keyed background a'la fixed virtual studio..

Re: Multi Cam Green Screen- ATEM1

PostPosted: Sun Mar 17, 2013 3:51 pm
by Mathijs
The question remains how big his screen setup is. If it is big enough, there is no need for the DVE within the keyer. If it isn't, it's a different story.

Re: Multi Cam Green Screen- ATEM1

PostPosted: Thu Aug 08, 2013 9:10 pm
by BrandtGillespie
Have an ME2 with 6 cam set up your answer helped me by switching through the ME2 bus and running Chroma Key on the ME1 bus. Thank you.

Re: Multi Cam Green Screen- ATEM1

PostPosted: Mon Feb 19, 2018 9:54 pm
by abogadosean
On a multi-angle ATEM M/E 1 new version, we are getting the previous CAMERA live, overlaying with the next "scene" other camera. Has anyone dealt with multi-angle chromakey camera artifacts? It is projecting both the first and second camera simultenously...

Re: Multi Cam Green Screen- ATEM1

PostPosted: Tue Feb 20, 2018 6:48 pm
by wicherdt
See examples live chromakeys videos on www_webcaster_pl (_ is dot)
ATEM 2 M/E Production Studio with CASPARCG as playout of backgrounds with ATEM macros.

I am waiting for somebodys tests "Advanced Chroma Keying" in new software 7.3 (5.0 camera micro studio) on ATEM 4 M/E .

Re: Multi Cam Green Screen- ATEM1

PostPosted: Tue Feb 20, 2018 7:54 pm
by Xtreemtec
wicherdt wrote:I am waiting for somebodys tests "Advanced Chroma Keying" in new software 5.0 on ATEM 4 M/E .
Make that 7.3 :) 5.0 was back in 2013 ;)