Bug 266764 – ManagedMediaSource not working on iOS 17.2 simulator

• Component: Media
• Status: NEW

[Yoeri]

Created attachment 469159 [details]
experiment result

ManagedMediaSource refuses to play or instantiate a ManagedSourceBuffer using addSourceBuffer on the iPhone Pro Max simulator with iOS 17.2.

I tried running the experiment here https://github.com/jyavenard/htmltests/blob/master/tests/ManagedMediaSource/bipbop.html on Safari on macOS 14.2 (with M2 pro chip) this resulted in the expected playback. On the iPhone simulator this resulted in no playback and only the 'loadstart' event being called. I've ran the experiment with both AirPlay required being enabled and disabled.

ManagedMediaSource.isTypeSupported also returns false for any codec, with the exception of 'media/webm'. I tested using an altered version of https://cconcolato.github.io/media-mime-support/ (altered to use ManagedMediaSource instead of MediaSource).

I have attached a screenshot of the result after trying the experiment on both macOS and the simulator.

I haven't been able to test on actual hardware running iOS 17.2. I'll hopefully be able to tonight.

[Radar WebKit Bug Importer]

<rdar://problem/120017425>

[Andriy]

ManagedMediaSource.isTypeSupported returns `true` for 'video/webm;codecs="vp8,opus"' in 17.2 iPhone simulators. Unfortunately, MP4 media sources aren't supported, making it useless in testing the most popular real-world libraries: Shaka Player, Hls.js, Dash.js, etc.