How to Fix Transparent Background Issue When Encoding Overlays Using the WebM Format
Channel: The Feelz
Date: 2020-11-16

Whenever you encode a WebM video with an alpha channel using Adobe Media Encoder, do you get a crappy-looking footage at the end? If so, then you're in the right place.
In this short tutorial, I'm going to walk you through fixing the transparent background issue when encoding overlays using the WebM format.
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SOLUTION:
Instead of using Media Encoder to render your overlay, use After Effects, instead. Add your footage to the render queue and under the Out Module dropdown panel, click on Lossless.
Under the Video Output section, change the channel to RGB + Alpha and start the rendering process.
While that is working, download Shutter Encoder from the link provided and proceed with the installation:
Software: https://www.shutterencoder.com/en/

Open Shutter Encoder and import or drag and drop your massive After Effect footage inside the software. Inside the "Choose Function" dropdown menu, select VP9 and the exit format should now be depicting WebM.
Next, to your right, click on "Advance Features" and check the "Enable Alpha Channel" box. Follow up by also checking the "2-pass" and "Max. Quality" check-boxes and then "Start Function".
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And that, ladies and gentlemen, would be the fix to your problem. You now have a small WebM overlay for your streams that also has a transparent background. If you have a better solution, be sure to drop a comment in the comments section. Questions are welcomed, as well.

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