yep webcodecs api is not supported in firefox .. any non based chromium browsers

Firefox supports the WebCodecs API behind a feature flag. Set dom.media.webcodecs.enabled to true. I am able to use your app this way -- the media import, timeline, and player functionality seems to work fine.

good to know, hopefully they will add it soon to work without flags

We're aiming to release this half, so in a month or so, on all desktop platforms, mobile will follow shortly after.

Then we'll gradually optimize (e.g. enable the use of more hardware encoders, decoding being generally in hardware at launch of supported) release after release, but generally almost everything will be supported at launch.

Great! thanks for letting me know, users will finally no longer be faced with sad info that its not supported :D