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Video with Alpha Channels

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Greg Ball
Video with Alpha Channels
on Mar 10, 2017 at 8:47:27 pm

My graphic artist gave me several animations of an iPhone and iPad He gave them to me with alpha channels. I'm trying to key these over a matte background, and no matter what composite mode I try, I can't seem to get it to work. I still get a black background, and never get to the matte colored background I want.

Is there a suggestion on how to do this? What combo do I use in composite mode and alpha channel?

Thanks so much.

Greg Ball, President
Ball Media Innovations, Inc.
https://www.ballmediainnovations.com


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Shane Ross
Re: Video with Alpha Channels
on Mar 11, 2017 at 1:00:28 am

No mode...you KEY it. Luma key most likely. Actually, if this is a file with a built in alpha, it should just DO it. What codec is this? ProRes 4444 allows embedded alphas

Shane
Little Frog Post
Read my blog, Little Frog in High Def


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Greg Ball
Re: Video with Alpha Channels
on Mar 11, 2017 at 3:27:47 am

Hi Shane,

The video as given to me keys perfectly. But it's an .h264 with an animation codec. I'm editing this on a 720p prores sequence.

I tried converting the videos to prores444 but it didn't key. Thoughts?

Greg Ball, President
Ball Media Innovations, Inc.
https://www.ballmediainnovations.com


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Shane Ross
Re: Video with Alpha Channels
on Mar 11, 2017 at 5:16:54 am

[Greg Ball] "But it's an .h264 with an animation codec. "

Sorry, that makes no sense. H.264 is a codec...Animation is a codec. It can be a MOV with the Animation codec.

[Greg Ball] "The video as given to me keys perfectly."

Wait....but I thought you said it doesn't key. You said:

[Greg Ball] "I'm trying to key these over a matte background, and no matter what composite mode I try, I can't seem to get it to work. I still get a black background, and never get to the matte colored background I want."

Shane
Little Frog Post
Read my blog, Little Frog in High Def


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