No alpha channel ?

[Adam Trachtenberg]

Since an alpha channel is grayscale there’s no need for 16 or 32 bit.

[Brian Bennett]

I was having this same problem. I couldn’t figure out how to render out an object with and Alpha Channel background and then I found out from my instructor at school what I was doing wrong. Tim Shetz is absolutely correct. I was rendering using “Make Preview” instead of “Render to Picture Viewer”. As soon as I rendered using “Render to Picture Viewer”, it worked perfectly. Hope this helps:

Settings:

QUICKTIME
1920 x 1080
Animation codec
Lossless
millions+

Alpha Channel is checked
Straight Alpha is checked

Render using “Render to Picture Viewer” NOT “Make Preview”