Alpha Channel Not Working

[Jes2000]

I rendered a QuickTime move today RGB+Alpha in After Effects and imported it into the Premiere to layer on top of another file. It does not show at all on the timeline though I can scrub through it just fine in the source Window. I know Adobe dropped support for older codecs, but I have the latest updates for both programs. Shouldn't they be equipped with the latest codecs?

[Ann Bens]

Alpha shows as black if you do not have any clip or whatever underneath in the timeline.

Check if the clip has alpha in the Preview Area.

[Jes2000]

It does

[excited_Genie16B8]

Are the QuickTime file and sequence set to the same resolution?

[Jes2000]

They are

[Carlos Ziade · Accepted solution]

try to go to 'Project Panel', from there right click on your .mov file - modify - interpret footage

and under Alpha Channel try to toggle between use alpha premultiplication from file and

conform alpha premultiplication to premultiplied alpha ... when dropping your .mov file into

the timeline right click on it and set to frame size

check if that helps

if it doesn't try exporting from After Effects as PNG / RGB + Alpha

[Jes2000]

Thank you.  I will try this in a second.

[Jes2000]

Set to frame size did it! (toggling the premultification settings didn't work) Is there something I need to do differently on the front end, or will I have to keep setting to frame size every time I want to do this?

[Carlos Ziade]

The After Effects comp size is different from the Premiere Pro Sequence

size, or the export settings from AE are set at different size from pp

sequence... should be the same

[Jes2000]

But they're both 1920 x 1080. Is there another factor?

[Ann Bens]

Post screenshot of properties of the AE mov file and sequence settings.

[Jes2000]

I checked, and you're right; they're different. Could have sworn I changed the AE comp. Thanks for your help!

[Carlos Ziade]

No problem you are welcome

[Michael24002861hvz5]

I just realized what I was dealing with. My ingest settings were creating proxies that didn't have an alpha channel.  Detaching proxies for those files brought them back.

[antonh65104129]

This saved me.... I had transcoding activated. You're a hero