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DNxHR with Alpha not working
Hi,
I’m working in Resolve and have exported keyed clips to DNxHR 12Bit with Alpha PreMult for finishing in AVID.
When I check the exported clips by re-importing them into Resolve, everything works as it should. In AVID however, the editor only has a black background, no Alpha (no transparency).
What gives? Any thoughts much appreciated.
Clay -
6 Replies
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Does Avid still import the extra data for Alpha clips/images?
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Your import or link options in Avid have to be specifically set to include the alpha channel. (Usually reversed alpha, if made with common workflows)
Glenn
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Thanks for the info. I’ve passed it on to the editor.
I’ll see what I can find online, but can you point me to a tutorial or documentation that covers this in depth?Best,
Clay -
In MC 2021, I can’t seem to get an alpha channel to import. Just upgrade so dealing with QuickTime limitations, so I made an OP1a mxf is After Effects with alpha… still no go. Just comes into Avid as a plain clip.
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I think this is what the dnxmov2mxf utility was built for.
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As mentioned above — double check that alpha channels are turned on in the import settings.
You also need to use straight matte when rendering — the alpha channel will still import but you’ll see issues with transparency. Without knowing more, that could be why you’re not seeing anything. In the most recent versions of MC, if you open up the effects controls for a clip with alpha, there’s now a checkbox for “foreground is premultiplied” that I assume takes care of that issue, but it is off by default.
I’m running MC 2020.12 and just did a quick test export from After Effects. These codecs imported properly with straight matte and alpha channel:
Quicktime DnxHR HQX
Quicktime DnxHD 175x
AVI
Prores4444
Quicktime animation
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