313362 2026-04-26 15:21:58 -0700 [Sequoia+] imported/w3c/web-platform-tests/media-source/mediasource-changetype-play-implicit.html is a flaky TEXT failure 2026-04-26 16:16:50 -0700 1 1 1 Unclassified WebKit Media WebKit Nightly Build Unspecified Unspecified NEW InRadar P2 Normal --- 1 rackler jer.noble webkit-bot-watchers-bugzilla webkit-bug-importer oldest_to_newest 2204672 0 rackler 2026-04-26 15:21:58 -0700 Description: imported/w3c/web-platform-tests/media-source/mediasource-changetype-play-implicit.html is a flaky TEXT failure on mac Sequoia Debug since bringup. The test fails on the earliest available Tahoe build through the current build. The test also fails on Tahoe -- so not Sequoia-specific. This issue can be reproduced using the command: run-webkit-tests --no-build --no-retry --no-show-results --exit-after-n-failures=1 --expect-pass --iterations=553 --force -1 --debug imported/w3c/web-platform-tests/media-source/mediasource-changetype-play-implicit.html ------------- BISECTION AUDIT TRAIL ------------- 299693@main, 4bc8ba895595 --> TEXT 299693@main, 4bc8ba895595 --> TEXT 300779@main, 030569620280 --> TEXT 302241@main, 67566fbf18ea --> TEXT 303418@main, 23a95af7a9d8 --> TEXT 305057@main, a8c1ee2c5c05 --> TEXT 306544@main, 1e6abe4adab7 --> TEXT 307935@main, a2b0e55f4150 --> TEXT 309275@main, 760f1d48c0e4 --> TEXT 310593@main, 3ac5b0e0cb77 --> TEXT 312005@main, 709cde155d94 --> TEXT 312008@main, e07a37a66540 --> TEXT 312039@main, 9c5edc91546a --> TEXT ------------- BISECTION AUDIT TRAIL END ------------- History: https://results.webkit.org/?version_name=Tahoe&suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fmedia-source%2Fmediasource-changetype-play-implicit.html Diff: --- +++ @@ -1,8 +1,20 @@ -FAIL Check if browser supports enough test media types and pairs of audio-only or video-only media with same bytestream format assert_true: Browser doesn't support at least 2 audio-only or 2 video-only test media with same bytestream format expected true got false +Harness Error (TIMEOUT), message = null + +PASS Check if browser supports enough test media types and pairs of audio-only or video-only media with same bytestream format +TIMEOUT Test audio-only implicit changeType for audio/webm; codecs="vorbis" <-> audio/webm; codecs="vorbis" Test timed out +PASS Test audio-only implicit changeType for audio/webm; codecs="vorbis" <-> audio/webm; codecs="vorbis" (using types without codecs parameters for addSourceBuffer) PASS Test audio-only implicit changeType for audio/mp4; codecs="mp4a.40.2" <-> audio/mp4; codecs="mp4a.40.2" -PASS Test audio-only implicit changeType for audio/mp4; codecs="mp4a.40.2" <-> audio/mp4; codecs="mp4a.40.2" (using types without codecs parameters for addSourceBuffer) +TIMEOUT Test audio-only implicit changeType for audio/mp4; codecs="mp4a.40.2" <-> audio/mp4; codecs="mp4a.40.2" (using types without codecs parameters for addSourceBuffer) Test timed out PASS Test audio-only implicit changeType for audio/mpeg <-> audio/mpeg -PASS Test video-only implicit changeType for video/mp4; codecs="avc1.4D4001" <-> video/mp4; codecs="avc1.4D4001" -PASS Test video-only implicit changeType for video/mp4; codecs="avc1.4D4001" <-> video/mp4; codecs="avc1.4D4001" (using types without codecs parameters for addSourceBuffer) +PASS Test video-only implicit changeType for video/webm; codecs="vp8" <-> video/webm; codecs="vp8" +PASS Test video-only implicit changeType for video/webm; codecs="vp8" <-> video/webm; codecs="vp8" (using types without codecs parameters for addSourceBuffer) +FAIL Test video-only implicit changeType for video/webm; codecs="vp8" <-> video/webm; codecs="vp9" assert_unreached: Unexpected event 'error' Reached unreachable code +FAIL Test video-only implicit changeType for video/webm; codecs="vp8" <-> video/webm; codecs="vp9" (using types without codecs parameters for addSourceBuffer) assert_unreached: Unexpected event 'error' Reached unreachable code +FAIL Test video-only implicit changeType for video/webm; codecs="vp9" <-> video/webm; codecs="vp8" assert_unreached: Unexpected event 'error' Reached unreachable code +FAIL Test video-only implicit changeType for video/webm; codecs="vp9" <-> video/webm; codecs="vp8" (using types without codecs parameters for addSourceBuffer) assert_unreached: Unexpected event 'error' Reached unreachable code +PASS Test video-only implicit changeType for video/webm; codecs="vp9" <-> video/webm; codecs="vp9" +PASS Test video-only implicit changeType for video/webm; codecs="vp9" <-> video/webm; codecs="vp9" (using types without codecs parameters for addSourceBuffer) +TIMEOUT Test video-only implicit changeType for video/mp4; codecs="avc1.4D4001" <-> video/mp4; codecs="avc1.4D4001" Test timed out +TIMEOUT Test video-only implicit changeType for video/mp4; codecs="avc1.4D4001" <-> video/mp4; codecs="avc1.4D4001" (using types without codecs parameters for addSourceBuffer) Test timed out 2204687 1 rackler 2026-04-26 16:06:50 -0700 <rdar://175636559> 2204691 2 ews-feeder 2026-04-26 16:16:50 -0700 Test gardening commit 312054@main (c06ceeb97a16): <https://commits.webkit.org/312054@main> Reviewed commits have been landed. Closing PR #63647 and removing active labels.