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Can I create a PNG (no BG) video of my GS video?

Posted: Mon, 21st Mar 2011, 6:31pm

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Moonloon1

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I want to create a PNG (no BG) video (from a Greenscreen video) that I can drop into FCP as the background could change. I don't want to be stuck with a final BG that the client might not like. This is an ethereal dream like music video. Can this be accomplished with VisionLab Studio?
Posted: Mon, 21st Mar 2011, 8:16pm

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Axeman

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Yes, its possible to export with alpha transparency. I'd recommend using the Quicktime Animation codec over a series of PNG images, as its simpler to manage a single video file, but PNG files should work just as well, if that's what you prefer.
Posted: Mon, 21st Mar 2011, 8:26pm

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Moonloon1

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I think I got it, I'm rendering a short clip right now but I used Apple Intermediate Codec will this work? Thanks for the quick reply, I used the alpha channel info link for the setting alpha channel, guess I'll find out shortly.
Posted: Mon, 21st Mar 2011, 9:06pm

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Axeman

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Yeah, I've not tried alphas in the Intermediate codec, but the Animation codec is 100% reliable, handles them perfectly, and ensures zero quality loss in the footage. So if Intermediate doesn't work out for you, I'd recommend Animation.
Posted: Mon, 21st Mar 2011, 9:44pm

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Moonloon1

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Ok, that didn't work, FYI you get a ghost of the composite shot. I am rendering a short clip with Animation Codec. I was trying to keep all the clips AIC but the alpha's will have to be rendered anyway so it really doesn't matter. I'll let you know here in a few minutes.

Oh, but what setting do I set the clips in FCP 6.0.8? Control click shows a menu for add, subtract, difference, alpha et.... I'm guessing the alpha? Sorry but I'm just now trying to wrap my head around the alpha thing. Thank you for pointing me in the right direction.
Posted: Mon, 21st Mar 2011, 11:36pm

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Moonloon1

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Animation looked the same as AIC "ghosty". While that works on the segment where the singer is dead on a bed in a washed out white room. I then overlap the part of the video where he gets up (this one gan be ghostly) and his body stays on the bed, I used a freeze frame for that part. But I still can't get the video to come out clear. I am trying to render in PNG this time will see.So what am I doing wrong here?
Posted: Tue, 22nd Mar 2011, 1:51am

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Axeman

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Can you explain what you mean by "ghosty"? Is the footage interlaced? Are you sure that your key is clean?
Posted: Tue, 22nd Mar 2011, 9:14am

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Simon K Jones

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Are you able to upload a sample for us to take a look at?
Posted: Tue, 22nd Mar 2011, 5:10pm

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Moonloon1

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Thats what I mean by ghosty. I have tried with AIC, Animation and PNG but all are getting the same results. I used the key in FCP and got it to work but I would like it cleaner.
Posted: Tue, 22nd Mar 2011, 6:10pm

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Axeman

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Are you sure the blend mode in FCP is set to Normal? It looks like there is an Add blend going on, or something.
Posted: Tue, 22nd Mar 2011, 7:47pm

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Moonloon1

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In FCP a Normal setting gives me a black BG, I tried them all. Am I using the wrong setting on the clip or is there another setting in the top menu for this?
Posted: Tue, 22nd Mar 2011, 9:26pm

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Axeman

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If normal gives you a black background, that's good, and that's the one you should use. The black background just means that the alpha channel isn't being applied yet, so you need to adjust the alpha mode to make sure the alpha is being applied. Open the Item Properties for the item, and change the alpha mode there.

I guess its worth double-checking; did you exactingly follow the instructions in the link I provided earlier, for alpha rendering?
Posted: Tue, 22nd Mar 2011, 11:09pm

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Moonloon1

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Yes, I have it bookmarked and referred to it while I was creating the clip (I have dual screens). "Open the Item Properties for the item, and change the alpha mode there." Ahh I didn't try that yet... I'll let you know. Thanks for all the help