webm-muxer has been deprecated in favor of Mediabunny, which entirely supersedes it. Mediabunny ships with an even better, easier-to-use, faster and more feature-rich WebM multiplexer, as well as muxers for many other formats, demuxers, WebCodecs abstractions and more, while keeping the bundle size tiny thanks to a tree-shakable design.
webm-muxer is no longer being maintained and will not receive any new features or bug fixes.
Mediabunny has got you covered. Refer to the following documents to jump right in:
No worries. You can easily migrate to Mediabunny in 10 minutes.
If you still need the docs for webm-muxer, you can find them here.