Export WebM with Transparency (Alpha)

[CCLB77]

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)

    

[Alba0D45]

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

[CCLB77]

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.

[CCLB77]

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!

[Alba0D45]

Than you so much. You have saved my day. 

[Lochie1979]

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.

[Supabets Studio2]

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

[Rick Gerard]

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.