How do I make a video animation with transparent background?

[Lawrence D’Oliveiro]

On Thursday, August 11, 2016 at 9:34:33 AM UTC+12, Martin Schöön wrote:
> Next on my TODO list is to look into the color composition idea. I
> have already looked this tutorial:
> https://youtu.be/sZzmksnzrX0

If the images you generate have an alpha channel, Blender can composite them directly, without needing colour-keying.