I can't possibly be the only person with this problem. I am using After Effects but have the same issue. DNxHD files refuse to acknowledge the alpha channel on import. The old workaround does not seem to work, either
I posted our issue over at Creative Cow also and got help there. The issue
is with "Compressed" vs. "Uncompressed" alpha. I re-exported a comp from
After Effects CC using uncompressed alpha setting and it came into Premiere
CC with no problems. I hope this helps you too. I know how frustrating it
[Personal info removed.]
Yeah, that is annoying, seeing as I've been using compressed alphas and
have to re-render things. Thanks though - I'm trying to get help from
Well here we are a year later and the problem still persists.
The only workaround is compressing to uncompressed alpha, which would be fine if it didn't create files twice as big as they need to be.
Just hit upon this problem, I just inherited a whole bunch of DNxHD graphics with compressed alphas. What workflow are u guys using for getting an uncompressed alpha? I don't have access to the original project files just the DNxHD with the compressed alphas, can I use them to get an uncompressed alpha if I rerender the file as dnxhd with an uncompressed alpha in after effects or is that the whole problem?
Either use cs6 or use AME to recompress with uncompressed alpha. By the way cc2014.1 still has the bug, so I don't see that going away any time soon.
ok thx, so the current AME CC will work to convert the files, I was thinking maybe I'd need to use sorenson squeeze.
AME cc will do the trick.
thx, also I have premiere cs6 installed, dropped the same clip into cs6 and yup alpha channel works like it should, has anyone filed a bug report on this, or this a "feature"
This is actually a problem across the board for all adobe products. AME preview won't display the alpha, after effects won't play compressed alpha and I would guess other adobe products aren't supporting dnxhd compressed alpha either.
I don't know if this has been answered elsewhere, but after trying a whole bunch of setting combinations eventually found the problem wasn't with compressed vs uncompressed but with the bits per channel in AME.
I used a custom setting to render some captions.
This was the codec settings:
Alpha - Compressed
Resolution - 1080i/50 120 8-bit
In the Basic Video Setting (under the Video tab in AME) I chose quality of 100 and Match Source for the rest, then crucially changed the Depth to 32 bit.
Voila!! Compressed, manageable file sizes for graphics with alphas intended for use in Avid. BOOM goes the dynamite!!