[bug][reproductible in sample app] VP8/VP9 codecs do not work on intel-mac safari

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Assessment

Research direction

Description

Describe the bug

VP8/VP9 codecs do not work on intel-mac safari - they either show green screens or a still frame of the publisher on all the subscriber videos.

In Livekit Sample app:

To Reproduce

Enter a meeting with a user using an intel-mac, on safari browser. Observe the videos.

Expected behavior

Videos should work normally.

Platform information

Whatever is in https://livekit.github.io/client-sdk-flutter/ as of today.

*** IMPORTANT ***
The issue is observable only in macs with intel chipset, when using Safari.

Getting set up

First steps

1. Read the whole issue, then the project's contributing guide.
2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
3. Fork the repository and make your change on a branch.
4. Open a pull request that references the issue number.

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