314723 2026-05-13 05:59:38 -0700 [MSE] Narrow processMediaSample's decode-key cleanup to true orphans and equal-key replacement 2026-05-15 00:01:56 -0700 1 1 1 Unclassified WebKit Media WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 jean-yves.avenard jean-yves.avenard webkit-bug-importer oldest_to_newest 2210476 0 jean-yves.avenard 2026-05-13 05:59:38 -0700 Address a latent gap in MSE "Coded Frame Processing" step 1.15 and tighten the B-frame DTS re-key guard it sits next to. The gap: samples whose decode key lies in [incoming.decodeKey, erasedSamples.decodeOrder().begin()->first) survive both step 1.14's sync cascade (which uses findSampleAfterDecodeKey = upper_bound, strictly greater) and step 1.15's main dependents sweep (which starts at erasedSamples.begin()). The block originally added in 205636@main covered this gap, but its range was too wide (lower_bound inclusive on both ends), so it also erased legitimate next-GOP samples when the cascade had deliberately broken early on a sync whose pts was greater than the incoming sample's. Spec issues were lodged as https://github.com/w3c/media-source/issues/374 and https://github.com/w3c/media-source/issues/375 2210477 1 webkit-bug-importer 2026-05-13 05:59:44 -0700 <rdar://problem/176971800> 2210711 2 jean-yves.avenard 2026-05-13 18:00:26 -0700 Pull request: https://github.com/WebKit/WebKit/pull/64888 2211133 3 ews-feeder 2026-05-15 00:01:54 -0700 Committed 313296@main (9d7e16e79a52): <https://commits.webkit.org/313296@main> Reviewed commits have been landed. Closing PR #64888 and removing active labels.