[Webkit-unassigned] [Bug 262950] New: WebCodecs HEVC isSupported returns true but decoding failed

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=262950

            Bug ID: 262950
           Summary: WebCodecs HEVC isSupported returns true but decoding
                    failed
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: macOS 13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit API
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: zzy8200 at gmail.com

With Safari Technology Preview,

const decoder_config = {
     codec: "hev1.1.6.L90.90",
     hardwareAcceleration: "no-preference"
};
(await VideoDecoder.isConfigSupported(decoder_config)).supported // returns True

But then, decoding HEVC failed with error: Unhandled Promise Rejection: EncodingError: Decoder failure.

I made a minimum reproduce page: https://zeruniverse.github.io/webcodecs_bg_hevc_test/new.html
and HEVC file sample: https://zeruniverse.github.io/webcodecs_bg_hevc_test/sample.hevc

Same page works in Chrome 117 on both Windows and MacOS

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