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No luck with video files that contain Alpha channel
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Tone13  
#1 Posted : Sunday, April 3, 2022 6:20:26 PM(UTC)
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Hi all,

I'm trying to bring in a video file (DnXHD in a .mov wrapper) that contains an alpha channel but vMix isn't seeing the alpha at all. I select 'Video Contains Alpha' when importing the file and I've tried turning on Premultiplied Alpha but nothing works?

Any suggestions?
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paco3346  
#2 Posted : Sunday, April 3, 2022 7:14:39 PM(UTC)
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I've only ever had alpha work on uncompressed .mov

See Martin's comments here: https://forums.vmix.com/...deo-transparency-in-vMix
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Tone13  
#3 Posted : Sunday, April 3, 2022 7:55:12 PM(UTC)
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Originally Posted by: paco3346 Go to Quoted Post
I've only ever had alpha work on uncompressed .mov

See Martin's comments here: https://forums.vmix.com/...deo-transparency-in-vMix


I saw that thread, doesn't say anything about uncompressed files only. And the link that Martin provided is no longer active.

I've heard Martin say in a video somewhere that .mov files with an alpha will work. Doesn't mention codec though, just the .mov wrapper.

Have done it with .png before but surely vMix will support a video file with alpha?

Surprisingly, there is very little info online about this.
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paco3346  
#4 Posted : Sunday, April 3, 2022 10:32:09 PM(UTC)
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I know this isn't a direct answer but I recall that when my graphics department used to export content from Premiere they were limited on what codec they could use when exporting with alpha. I think it may have been ProRes.
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Peter1000  
#5 Posted : Monday, April 4, 2022 12:03:27 AM(UTC)
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I can easy export a Photoshop animation to a Quicktime Animation, direct in Photoshop. (file, export, render video)
It should be easy to do the same in Adobe Premiere.
vMix plays this well, with key.

download Animation-Video and PS file here

Sorry, my PS is in german.
animation export.PNG (204kb) downloaded 1 time(s).
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