png is another useful codec which has alpha support.

On Nov 14, 2007, at 4:13 PM, Pierre-Olivier Latour wrote:

QTZ tracks inside QT movies do have an alpha channel, so you can do compositing and other interesting stuff with it

On Nov 14, 2007, at 10:50 AM, Michael Mench wrote:

Right now the only codec that QT uses that will take an Alpha Channel along is the Animation Codec... at Millions of Colors +... where the + is the Alpha Channel
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