Exporting sequence containing track matte key using alpha channel only - exports just white

Community Beginner ,
Dec 03, 2020

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Hi! I hope you can help me.

 

I would like to render out an intro sequence that opens my online training videos. I want it export alpha channel only so to preserve transparency (it's a transition sequence, so I want it to appear over the shots either side of it). The problem is that the sequence itself has a track matte key using alpha matte - and when I select 'export alpha channel only' in the output options, everything turns white (the background color). Can anyone please help me to export this with transparency AND having a track matte key?

 

Many thanks

 

jonathan

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Editing, Effects and Titles, Error or problem, Export

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Exporting sequence containing track matte key using alpha channel only - exports just white

Community Beginner ,
Dec 03, 2020

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Hi! I hope you can help me.

 

I would like to render out an intro sequence that opens my online training videos. I want it export alpha channel only so to preserve transparency (it's a transition sequence, so I want it to appear over the shots either side of it). The problem is that the sequence itself has a track matte key using alpha matte - and when I select 'export alpha channel only' in the output options, everything turns white (the background color). Can anyone please help me to export this with transparency AND having a track matte key?

 

Many thanks

 

jonathan

TOPICS
Editing, Effects and Titles, Error or problem, Export

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34

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Dec 03, 2020 0
Adobe Community Professional ,
Dec 03, 2020

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screenshot.jpg

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Dec 03, 2020 1
Community Beginner ,
Dec 03, 2020

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Thank you - I've posted them as a reply. 

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Dec 03, 2020 1
Community Beginner ,
Dec 03, 2020

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Screenshot 2020-12-03 at 15.50.21.pngScreenshot 2020-12-03 at 15.50.13.png

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Dec 03, 2020 0
Adobe Community Professional ,
Dec 03, 2020

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As far as I know H.264 does not support an alpha channel

Instead use Prores or Cineform.

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Dec 03, 2020 1
Community Beginner ,
Dec 03, 2020

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Thank you. I've experimented with a number of output options, but all of them bascially remove the track matte.

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Dec 03, 2020 0
Ann Bens LATEST
Adobe Community Professional ,
Dec 03, 2020

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Did you use a preset that contains the alpha channel such as Prores 4444 with alpha and then set the export option render alpha channel only?

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Dec 03, 2020 0