[Webkit-unassigned] [Bug 85851] MediaStream API: support MediaStreamRecorder implementation

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=85851

--- Comment #52 from Diego Caravana <diego.caravana at gmail.com> ---
(In reply to Kim Scott from comment #50)
> We're currently just not supporting Safari at https://lookit.mit.edu
> (video-based online developmental research) because of this issue. Would be
> very excited about MediaStreamRecorder support!

Thank you Kim, I was planning to do something to fill this gap anyway, but your project gave me another strong reason to do it.

So I'm even happier now to share the proof of concept I put together.

Basically it's a MediaRecorder polyfill that merges code from these two projects:

- https://github.com/GoogleChromeLabs/webm-wasm
- https://github.com/kbumsik/opus-media-recorder


The first one provides a way to efficiently create a webm video file through Wasm, while the second is a (good) example of MediaRecorder polyfill (just for audio recording, though).

All the credit goes to these two projects, I just packaged them together.

Both are fairly complex projects, so to make things simpler I worked on this file only:

https://github.com/dcaravana/webm-wasm/blob/ios_test/demo/live_download_mediarecorder.html


I want to reiterate that this is just a prototype, the code is quite rough and far from being usable in production, so feel free to take inspiration from it or even contribute back.

I'm quite proud of this result as it defeats any  reasoning behind holding the MediaRecorder implementation back in Safari (in fact, it took me a bit more that one day of work).

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