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Vegas Not Seeing Alpha Channel in DnxHD files rendered in After Effects

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Steven Broido
Vegas Not Seeing Alpha Channel in DnxHD files rendered in After Effects
on Apr 22, 2014 at 11:47:48 am

Hi All!

Just searched the forums and can't find anything recent on this topic.

Trying to export files from After Effects CC with alpha channels to Avid DnxHD format.

.MOV is the wrapper. Enabling RGB+Alpha, straight unmatted, with UNCOMPRESSED Alpha in Avid DnxHD pull down menu.

My question: Has anybody successfully imported Avid DnxHD file with Alpha channels intact in Vegas 13?

Also tried changing media type in Vegas to "straight unmatted" under media properties for the clip.

Still black where I should be seeing Alpha.

Any ideas?

OR - How are you kicking out lossless (or fairly lossless) files from After Effects to Vegas with Alphas intact?

Thx!

Steve


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Mike Kujbida
Re: Vegas Not Seeing Alpha Channel in DnxHD files rendered in After Effects
on Apr 22, 2014 at 12:19:26 pm

TO the best of my (somewhat limited) knowledge, DnxHD still doesn't do alpha channels.
If I need this feature from AE, I render it out as a PNG image sequence and then bring that into Vegas using the Import Image Sequence feature. Works like a charm for me.


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Don Cady
Re: Vegas Not Seeing Alpha Channel in DnxHD files rendered in After Effects
on Apr 22, 2014 at 2:03:07 pm

I just tried exporting and importing a file using DNxHD 145 in Sony Vegas and it worked fine. I did have to go into the properties and enable the alpha channel. I did this by clicking on the configure button and turning on the alpha channel under the quicktime settings for Avid DNxHD 145. It is near the video format selection area. I hope this helps you.



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Steve Rhoden
Re: Vegas Not Seeing Alpha Channel in DnxHD files rendered in After Effects
on Apr 22, 2014 at 2:44:59 pm
Last Edited By Steve Rhoden on Apr 22, 2014 at 2:45:44 pm

From what you outlined in your description, you should not
be having any issues. In the project media window you will
still see a black background, its when you drop it on the
timeline above your composite you will notice the change.
Or try premultiply from After effects in the render settings
and Premultiplied in its media properties back in Vegas.

Steve Rhoden
(Cow Leader)
Film Editor & Compositor.
Filmex Creative Media.
http://www.facebook.com/FilmexCreativeMedia
1-876-461-9019


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Tyson Onaga
Re: Vegas Not Seeing Alpha Channel in DnxHD files rendered in After Effects
on Apr 22, 2014 at 7:49:58 pm

DNxHD does do Alpha. The problem is that is Avid's Alpha ... which is back-asswward from everybody else. I opened a ticket with Avid re: their DNxHD encoder w/ Alpha. Turns out the resulting file works ONLY in Avid software.

If you need Alpha from AE to Vegas, best to use QT w/ Animation or PNG.



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Norman Black
Re: Vegas Not Seeing Alpha Channel in DnxHD files rendered in After Effects
on Apr 22, 2014 at 11:43:48 pm

Avid does Alpha inverted from what most everyone else does.

If the Alpha channel coming in from a DNxHD is in "avid" format, aka Inverted, then all you need to is Invert the alpha channel using Mask Generator, select the alpha channel and check invert. This is for files coming into Vegas.


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Lori Lin
Re: Vegas Not Seeing Alpha Channel in DnxHD files rendered in After Effects
on Dec 6, 2016 at 10:03:26 am

I'm bumping this hoping that Norman can elaborate on the "Mask Generator" fix for DnxHD files alpha channels in Vegas, and what are the exact settings being used?


On VP 12 I have tried every permutation of this and it doesn't really work. If I export a pure white text on a transparent background, that works well with the luminance mask, but anything else doesn't look right in Vegas. If there are colors in what I want to show, they are still partially transparent.

Cheers,
Lori


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