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test(auto-thumbnail): [PKG-AUTO-THUMB-03] isolate native first-frame decoding checkpoint

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Harvey Zhao committed 2026-09-14 11:41:33 +08:00
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commit afb632d16f
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refactor/risks.json
+4 -2
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@@ -4187,11 +4187,13 @@
"refactor/changes/2026-09-14-PKG-AUTO-THUMB-03-rendering-readiness.md",
"refactor/baselines/auto-thumbnail-rendering-readiness.json",
"refactor/changes/2026-09-14-PKG-AUTO-THUMB-03-first-seek.md",
"refactor/baselines/auto-thumbnail-first-seek.json"
"refactor/baselines/auto-thumbnail-first-seek.json",
"refactor/changes/2026-09-14-PKG-AUTO-THUMB-03-native-decoder.md",
"refactor/baselines/auto-thumbnail-native-decoder.json"
],
"compatibleResolution": "Establish actual decoded-frame readiness for the existing timeline/grid and preserve silent independent extraction; do not waive colored pixel checks as unsupported media. Intrinsic-size hidden/opacity/clip/visible rendering crossed with current/readyState/first-loadeddata-event strategies still misses the unique first frame in all 12 Windows WebKit profiles. Correct Firefox frames retain totalVideoFrames=0, so that counter cannot be a portable readiness gate. Do not reintroduce these unvalidated workarounds. First-seek diagnostics additionally exclude drawing the first loadeddata frame without seek, one/two RAF waits, post-seek RAF waits and verified forward/back seeking on the recorded Windows WebKit host. The warm comparison first had an invalid stale-event completion, then a timeout; final bounded retries verify actual [1,1,0] seeking and still miss purple. Controls retain purple. These are exclusions, not production fixes.",
"closureCriteria": "Candidate source and artifacts generate usable sampled pixels on native browser controls with lifecycle checks; supported Safari and core combinations remain explicit final gates.",
"workspaceState": "The frames module now waits for native presentation and seek completion on capable browsers. Chromium/Firefox source/main/legacy assert all five cells including first purple frame, second red cell, legitimate black and presentation times. Callback-less Windows WebKit first two cells remain diagnostic, later cells asserted; physical Safari/core combinations remain open. 84 native lifecycle/pixel cases passed with explicit held native-frame vs Blob-fallback paths; 19 new Node cases fail 17 ways on prior checkpoint and all 52 current cases pass per candidate. Risk and task03 remain open."
"workspaceState": "The frames module now waits for native presentation and seek completion on capable browsers. Chromium/Firefox source/main/legacy assert all five cells including first purple frame, second red cell, legitimate black and presentation times. Callback-less Windows WebKit first two cells remain diagnostic, later cells asserted; physical Safari/core combinations remain open. 84 native lifecycle/pixel cases passed with explicit held native-frame vs Blob-fallback paths; 19 new Node cases fail 17 ways on prior checkpoint and all 52 current cases pass per candidate. Risk and task03 remain open. Native-only18-case Windows probe also misses the purple first frame in all6 WebKit26.6 cases (hidden/visible paused and immediate play-pause, original and no-B-frame H.264);12 Chromium/Firefox controls recover it. No ArtPlayer/plugin is imported, narrowing but not resolving the native surface boundary. Rate/offset/layout explorations failed and must not be reintroduced as assumed fixes."
},
{
"id": "VTT-THUMB-DIST-01",