Ogg Opus is fully supported from iOS 18.4 and macOS 15.4 Sonoma onwards

[Schweinepriester]

Ready to merge, imho!

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See discussion below, insights have changed since posting 😅

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Following #7282 I now tried to actually test:

While https://wpt.fyi/results/?label=master&product=chrome%5Bexperimental%5D&product=edge%5Bexperimental%5D&product=safari%5Bstable%5D&product=safari%5Bexperimental%5D&aligned&q=opus sees changes

the first example on https://tests.caniuse.com/opus continues to not work

and neither does "Example of use in a web page" on https://opus-codec.org/examples/

All tests done on macOS 14.7.4 using Safari_18.4_for_macOS_Sonoma_beta_3.dmg.

As such, revert the changes from #7282.

CC @jensimmons in case I missed something or support needs macOS 15 or the like.

[jensimmons]

Yes, macOS 15.4 Sonoma is required — or iOS/iPadOS 18.4, visionOS 2.4.

[Schweinepriester]

Thank you, I shall test and adjust the PR accordingly!

[jyavenard]

For added clarity:
Opus is an audio codec. It can be used in the Ogg, WebM and MP4 containers.

Safari supports opus in webm and mp4 on all platforms.
Opus in Ogg is supported from Sonoma and iOS 18. Maybe the title of the test should be improved for clarity.

[Schweinepriester]

thank you both for clarifying!

Opus is an audio codec. It can be used in the Ogg, WebM and MP4 containers.

aye, and https://tests.caniuse.com/opus tests all three - unfortunately only visible on hover, so here's a screenshot of the DOM:

though, as I've only just now learned via https://en.wikipedia.org/wiki/Opus_(audio_format)#Containers

Opus was originally specified for encapsulation in Ogg containers, specified as audio/ogg; codecs=opus, and for Ogg Opus files the .opus filename extension is recommended.

i.e., at least confusing to me, that .opus is Opus in Ogg 😅

[jensimmons]

This PR (at the moment) basically resets Safari back to only supporting in WebM. Which is not correct. Safari 18.4 adds support for Opus in Ogg, for macOS Sequoia 15.4 and above, as well as iOS, iPadOS, and visionOS.

Also, I expect we have had support for Opus in MP4 for some time, but am looking into since when.

[Schweinepriester]

This PR (at the moment) basically resets Safari back to only supporting in WebM. Which is not correct. Safari 18.4 adds support for Opus in Ogg, for macOS Sequoia 15.4 and above, as well as iOS, iPadOS, and visionOS.

yepyep, working on adjusting o7

[Schweinepriester]

Can confirm that Ogg Opus works on iPadOS 18.4:

iPadOS 18.3:

iPadOS 18.4

🚀

As such, PR adjusted!

[jensimmons]

Footnotes 1, 2, and 3 need to be update to reflect support for MP4. Maybe it should say doesn't support Ogg Opus instead of does support?? (I'm too tired to tell atm.) Something more than

Supported in a WebM container (all bitrates).

Because it was supported in WebM and MP4 during all that time.

(I can take a fresh look tomorrow with a better suggestion.)