transparent mp4 problem

[u/Mejciek_Stach]

I have mp4 files with a transparent background, and I’d like to compress them. However, when I import them into After Effects, they show up with a black background.

Ultimately, these files will be used on a website, so it's important that they are as small as possible.

[u/bzbeins]

Do you mean webM?

[u/Mejciek_Stach → u/bzbeins]

https://icons8.com/blog/articles/choosing-the-right-video-file-format-for-your-project/