314997 2026-05-17 20:56:51 -0700 (313296@main) ASSERTION FAILED: m_samples.decodeOrder().findSampleWithDecodeKey 2026-05-18 07:11:40 -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 2211605 0 jean-yves.avenard 2026-05-17 20:56:51 -0700 ``` ASSERTION FAILED: m_samples.decodeOrder().findSampleWithDecodeKey(DecodeOrderSampleMap::KeyType(sample.decodeTime(), sample.presentationTime())) == m_samples.decodeOrder().end() /Volumes/Data/worker/macOS-Tahoe-Debug-Build-EWS/build/Source/WebCore/platform/graphics/TrackBuffer.cpp(132) : void WebCore::TrackBuffer::addSample(MediaSample &) 1 0x307f764e0 WebCore::TrackBuffer::addSample(WebCore::MediaSample&) 2 0x3007e9428 WebCore::MediaPlayerPrivateWebM::didProvideMediaDataForTrackId(WTF::Ref<WebCore::MediaSampleAVFObjC, WTF::RawPtrTraits<WebCore::MediaSampleAVFObjC>, WTF::DefaultRefDerefTraits<WebCore::MediaSampleAVFObjC>>&&, unsigned long long, WTF::String const&) 3 0x300809320 WebCore::MediaPlayerPrivateWebM::MediaPlayerPrivateWebM(WebCore::MediaPlayer&)::$_2::operator()(WTF::Ref<WebCore::MediaSampleAVFObjC, WTF::RawPtrTraits<WebCore::MediaSampleAVFObjC>, WTF::DefaultRefDerefTraits<WebCore::MediaSampleAVFObjC>>&&, unsigned long long, WTF::String const&) const ``` Regression from 313296@main bug 314723 2211606 1 webkit-bug-importer 2026-05-17 20:56:57 -0700 <rdar://problem/177312155> 2211608 2 jean-yves.avenard 2026-05-17 20:57:56 -0700 313296@main exposed a real bug, demuxed frames would have been silently dropped, luckily here they were all audio samples , but such error could lead to real decoding errors. 2211613 3 jean-yves.avenard 2026-05-17 21:09:59 -0700 Pull request: https://github.com/WebKit/WebKit/pull/65086 2211722 4 ews-feeder 2026-05-18 07:11:38 -0700 Committed 313413@main (57e44bb6ce39): <https://commits.webkit.org/313413@main> Reviewed commits have been landed. Closing PR #65086 and removing active labels.