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Export WebM with Transparency (Alpha)

Community Beginner ,
Nov 17, 2020 Nov 17, 2020

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Hello everyone,

I have a problem with rendering a project.

I want to export my comp to a .webm (for streamlab) to keep the transparency (alpha). I see my transparency in AE and I check the box "include alpha channel" in Media Encoder but the result is with a black background and no transparency.

When i render in .mov i see the transparency and even by trying to convert the .mov file into a .webm file it doesn't work and the transparency dissapear.

Any ideas how to fix this ?

Here is some capture of my files (AE view, Media Encoder settings, .mov, .webm)

AE.PNG

mediaencoder.PNG

rendumov.png

renduwebm.png

    

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New Here ,
Mar 13, 2021 Mar 13, 2021

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I have the same problem and I think I'm going crazy. If you have solved the problem can you share it with the world please?

Thank you anyway, I don't feel so lonely anymore xD

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Community Beginner ,
Mar 13, 2021 Mar 13, 2021

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Hello, yes i have solved this (well kind of).

I export my video in Quicktime with the alpha channel checked. (Like that i have a quicktime video with transparency.)

Then i open this quicktime video in a new comp in after effect and i export it in webm with alpha channel checked.

 

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Community Beginner ,
Mar 13, 2021 Mar 13, 2021

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The thing is that it seems to not appear transparent in the viewport with VLC for exemple but when you put it in streamlab, the transparency do work!

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New Here ,
Mar 13, 2021 Mar 13, 2021

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Than you so much. You have saved my day. 

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Community Beginner ,
Sep 27, 2023 Sep 27, 2023

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Are you using media encoder or straight from AE? I don't have the ability to export from AE to WebM, and in ME I do, but I have no check box for alpha channel, just alpha channel only, Then I end up with the content I want missing, and a black background.

 

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New Here ,
Dec 06, 2023 Dec 06, 2023

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I have the same problem. Did you find a solution?

 

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Community Expert ,
Mar 13, 2021 Mar 13, 2021

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Almost all media players display transparency as black. Transparency is not usable unless the app you are using to playback the video supports it. It takes another 8-bit channel and most media players are RGB only. 

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