HEVC playability is inaccurately evaluated on Firefox for Windows 10 17134

[privaloops]

HTTP-streaming try to play hev1.2.4.L120.B0 codec on Firefox > 133 (Since FF is capable of playing HEVC H265) on Windows_NT 10.0 17134

But

Windows 10 can play HEVC only >= Windows_NT 10.0 17763 (and with codec installed)

Note

• ‘video.canPlayType’ return « probably » on Windows_NT 10.0 17134 but ‘MediaSource.isTypeSupported’ return true (see captures) which is wrong.
• HLS.JS skip the H265 quality

Test url (⚠️select 1080p quality)

https://videojs-http-streaming.netlify.app/?debug=false&autoplay=false&muted=false&fluid=false&minified=false&sync-workers=false&liveui=true&llhls=true&url=https%3A%2F%2Fmanifest-arte.akamaized.net%2Fapi%2Fmanifest%2Fv1%2FGenerate%2F9113a29d-5262-4f17-9e6a-17a85675d341%2Fen%2FXQ%2BKS%2BCHEV1%2F117218-000-B.m3u8&type=application%2Fx-mpegURL&keysystems=&buffer-water=false&exact-manifest-timings=false&pixel-diff-selector=false&network-info=false&dts-offset=false&override-native=true&object-fit=false&use-mms=true&preload=auto&mirror-source=true&forced-subtitles=false&native-text-tracks=false

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