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Codec w/Alpha Channel?

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James Whittington
Codec w/Alpha Channel?
on Apr 21, 2010 at 11:16:36 pm


I am creating a video that is to be used in a web banner.

It is 11 seconds long, must include an alpha channel, and has to be 512x288 pixels.

I was told to provide a .mov that is under 1MB. I'm having a really hard time finding a codec that supports alpha channels and provide decent quality at this size. I've even tried exporting straight to flash (out of AE) and can't get it under 3MB or so.

Any ideas???


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Mike Smith
Re: Codec w/Alpha Channel?
on Apr 22, 2010 at 8:12:39 am

I'm a little confused as to who is going to be encoding the actual video to be deployed.

For the alpha channel to be used on the web, the video will have to be an flv file, in Flash's native VP6 codec. So that's what you'd be encoding to, finally.

If you are supplying a mov with alpha channel, someone else would have to encode that to flv. Perhaps they want to key your video over some other background (or backgrounds, prior to encoding - so the mov is an intermediate step?)

In that case, animation with colors set to Millions+ would seem good - though nowhere near the file size limit.

But again, why the file size limit if this is an intermediate step - if the video were to be keying and recompressing, then it might produce better results to supply a large file with a clean codec ... hmm, as I started, I am confused.

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