[Webkit-unassigned] [Bug 231449] New: Unity WebGL cannot play audio (MP3) in Safari 15 on macOS 10.15

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=231449

            Bug ID: 231449
           Summary: Unity WebGL cannot play audio (MP3) in Safari 15 on
                    macOS 10.15
           Product: WebKit
           Version: Safari 15
          Hardware: Mac (Intel)
                OS: macOS 10.15
            Status: NEW
          Severity: Blocker
          Priority: P2
         Component: Web Audio
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aaron at shadowhealth.com
                CC: cdumez at apple.com

Created attachment 440667

  --> https://bugs.webkit.org/attachment.cgi?id=440667&action=review

Console errors related to this issue

Unity3D WebGL builds cannot play audio in Safari 15.0 on macOS 10.15.7

Errors:

Unhandled Promise Rejection: EncodingError: Decoding failed
Loading FSB failed for audio clip: "(name)".


Reproduced on a few machines ranging from MB air 2013 to MBP 2019
Reproduced with Unity builds from Unity 2018.3, 2019.4, and 2020.3 versions
Fails playing audio clips which are included in the build as well as those retrieved at runtime via Unity's www interface (XHR)
Confirmed for at least MP3 format files; Mime type "audio/mpeg"

This has been reproduced on our own products as well as games on simmer.io (which is a better repro as they're publicly accessible!)
to pick one simmer.io game at random: https://simmer.io/@henridecamps/learn-french-rpg

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