[Experimental][WebAPI] Implement VideoEncoder on Linux

[pepelsbey]

Acceptance Criteria

• [x] The listed features are documented sufficiently on MDN
• [ ] BCD is updated
• [x] Interactive example and data repos are updated if appropriate
• [x] The content has been reviewed as needed

For folks helping with Firefox related documentation

• [x] Set bugs to dev-doc-complete
• [x] Add entry to Firefox release notes if feature is enabled in release
• [x] Add entry to Firefox experimental features page if feature is not yet enabled in release

Related Gecko bugs

• https://bugzilla.mozilla.org/show_bug.cgi?id=1749047

Other

• [x] Check content open issues to see if any pertain to the subject matter. If there are any that can be closed because of the work, do so. If there are any that can be fixed relatively quickly because of the knowledge from completing this issue and you have time, feel free to go ahead and fix them.
• [x] Check if glossary updates are required for the feature you're documenting - whether an existing term needs to be updated or a new term should be added.
• [x] Check if BCD update means that content pages need to have experimental markup removed or deprecated markup added (front matter tags and macros).

[hamishwillee]

EDITED. From https://bugzilla.mozilla.org/show_bug.cgi?id=1749047 and responses

• Work done is behind pref dom.media.webcodecs.enabled which is enabled on nightly.
• Right now only works on Linux platforms.
• Planned to work on other platforms in coming cycles and then be released.
• Includes (at least) VideoEncoder (and EncodedVideoChunk, VideoFrame, VideoColorSpace and VideoDecoder (though not fully check if that uses anything.
• MDN IDL appears to matches the spec and the developers asserts that it does.
• Developer (Paul) has offered to do BCD and I have accepted. That will confirm the supported items.

So essentially I think for this release we just need experimental features/release note update, and a sanity check that the docs above broadly match the spec.

[hamishwillee]

Status

Note, developer has offered to do BCD for this feature. As exposing stuff is up to the dev team, not waiting on this for a "done" status.

• [x] BCD - https://github.com/mdn/browser-compat-data/pull/22289
• [x] Docs - seems in pretty good state - matching the spec
• [x] Release notes #32233
• [x] Experimental features #32233
• [x] dev-doc-complete

[pepelsbey]

@hamishwillee, I asked Paul regaring the BCD entry for the feature. Is it something that we can maybe do ourselves?

[hamishwillee]

@pepelsbey Yes we could - but when is the trigger since we've asked for this? I can do this next week if no response.

[hamishwillee]

OK, I added a BCD.

[pepelsbey]

Thank you :)