[ iOS18 ] 3 wpt/webcodecs/* layout tests are constantly failing.

• Component: Web Audio
• Status: NEW ---

[Ben Schwartz]

The following two tests (and many variants) are constantly failing on iOS 18:

imported/w3c/web-platform-tests/webcodecs/full-cycle-test.https.any.html
imported/w3c/web-platform-tests/webcodecs/full-cycle-test.https.any.worker.html

HISTORY:

No link, as we don't currently perform automated testing on iOS 18 in CI.

TEXT DIFF:

Most diffs have lines similar to "+(Encoder Configuration) AllowFrameReordering is not supported for H264_Baseline_3_0", or "DataError: Key frame is required".

REPRODUCIBILITY:

I was able to reproduce this issue on the latest iOS 18 simulator ToT using the following command:

run-webkit-tests --ios-simulator -v --clobber-old-results imported/w3c/web-platform-tests/webcodecs/full-cycle-test.https.any.html imported/w3c/web-platform-tests/webcodecs/full-cycle-test.https.any.worker.html

[Ben Schwartz]

It appears that the failures stem from an issue with h264. The unexpected failures are:

  imported/w3c/web-platform-tests/webcodecs/full-cycle-test.https.any.html?h264_annexb
  imported/w3c/web-platform-tests/webcodecs/full-cycle-test.https.any.html?h264_avc
  imported/w3c/web-platform-tests/webcodecs/full-cycle-test.https.any.worker.html?h264_annexb

[Radar WebKit Bug Importer]

<rdar://problem/131640556>

[Ben Schwartz]

^ and: imported/w3c/web-platform-tests/webcodecs/videoDecoder-codec-specific.https.any.html?h264_annexb

[EWS]

Test gardening commit 280929@main (1168d5b38082): <https://commits.webkit.org/280929@main>

Reviewed commits have been landed. Closing PR #30773 and removing active labels.