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Most Efficient QuickTime w/ Alpha

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Michael GeorgeMost Efficient QuickTime w/ Alpha
by on May 25, 2015 at 6:39:10 pm

I'm creating a running clock animation for a sports webcast that uses Telestream's Wirecast. Because the composition is very long (the length of the game), I'd like to know the best route to deliver a QuickTime with alpha that minimizes file size.

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Walter SoykaRe: Most Efficient QuickTime w/ Alpha
by on May 25, 2015 at 6:46:24 pm

There's really no such thing as a light-weight production codec that supports alpha.

For a clock, I'd use QuickTime Animation codec, but since it only update every second, I'd make the comp and output movie run at 1fps; that'll instantly cut the file size by a factor of 30.

Walter Soyka
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Matthew WoodsRe: Most Efficient QuickTime w/ Alpha
by on May 26, 2015 at 2:55:49 pm

1 fps is a great idea. Another thing to consider is having separate rgb and alpha movies, and luma matting/track matting the color movie with the alpha. Then you can use whatever codec you want for your rgb. Depending on your animation, for something like a clock, you might even be able to use a still image for your alpha channel.

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