305208 2026-01-09 09:21:36 -0800 [MSE] Fix sample DTS to prevent deletion of preexisting samples when PTS doesn't conflict 2026-02-12 04:51:12 -0800 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 eocanha eocanha webkit-bug-importer oldest_to_newest 2170697 0 eocanha 2026-01-09 09:21:36 -0800 (This text is best viewed using a monospace font) Let's consider a preexisting samples A, B, C, and a new sample N with the following timestamps: Decoding time Presentation time ------------- ----------------- Sample A: 827.826164000 827.826164000 Sample B: 827.826164100 827.826164100 Sample C: 827.826164200 827.826164200 Sample N: 827.826125000 827.909542000 These disparities in DTS vs. PTS offsets between samples A and B exist because both samples come from completely different videos (eg: because of ad insertion). In a timeline: DTS ···NABC······· PTS ····ABC···N··· Judging by PTS, the samples A, B, C should remain and theoretically don't need to be erased. However, considering DTS, the samples A, B, C have to be erased, because the sample N would reach the video decoder earlier (by decoding ordering) and change the state of the decoder, making it unsuitable for samples A, B, C. It would be nice to find a way to avoid erasing samples A, B, C in this specific case. 2170702 1 eocanha 2026-01-09 09:29:11 -0800 Pull request: https://github.com/WebKit/WebKit/pull/56346 2170703 2 eocanha 2026-01-09 09:33:34 -0800 See: https://github.com/WebPlatformForEmbedded/WPEWebKit/issues/1542 2171479 3 eocanha 2026-01-13 10:32:12 -0800 Some of the detected test failures are caused by the fact that edit list support is disabled in WebKitGTK, and this is creating small offsets that trigger unnecessary "out-of-order frame detected" events. I've also tested the patch in downstream wpe-2.38[1] (with edit lists support), running the layout test there, and the mediasource-config-change-mp4-v-framerate.html test at least passes, but video decoding errors appear. This is enough evidence to consider the fix as problematic. I'm withdrawing this PR by now. [1] https://github.com/WebPlatformForEmbedded/WPEWebKit/tree/eocanha/eocanha-debug-160 2175573 4 eocanha 2026-01-27 15:22:11 -0800 Re-opening for pull request https://github.com/WebKit/WebKit/pull/57363 2180752 5 ews-feeder 2026-02-12 04:50:19 -0800 Committed 307359@main (13a26d1f9065): <https://commits.webkit.org/307359@main> Reviewed commits have been landed. Closing PR #57363 and removing active labels. 2180753 6 webkit-bug-importer 2026-02-12 04:51:12 -0800 <rdar://problem/170225068>