Video fitted poster frame (declared poster slot) - #6031
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The video family declares a poster screenshot slot whose capture-only component decodes one frame — an exact timestamp derived only from the file's duration (one second in, clamped to the middle of shorter clips) — and cover-crops it into a static canvas. The <video> element never enters the DOM, so nothing animates between settle and shot and unchanged bytes byte-hash to the same poster across reindexes; readiness flows through the data-screenshot-pending contract. jpeg output (a photographic frame), keyBy 'file-content', useAsThumbnail routing it to the fitted cell through the view model's thumbnail seam. Part of CS-12573. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Host Test Results 1 files ±0 1 suites ±0 2h 4m 57s ⏱️ + 3m 39s Results for commit d1d1a4f. ± Comparison against earlier commit ce06c1c. Realm Server Test Results 1 files ±0 202 suites ±0 1h 9m 16s ⏱️ +23s Results for commit d1d1a4f. ± Comparison against earlier commit ce06c1c. For more details on these errors, see this check. |
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What this does
Stacked on #6030 (Office posters).
VideoDef(MP4/WebM/MOV families inherit it) declares aposterscreenshot slot (170×250 @ dsf 2,type: 'jpeg',keyBy: 'file-content',useAsThumbnail). The capture-only component (file-formats/video-captures) seeks a deterministic timestamp — one second in, clamped to the middle of shorter clips, derived only from the file's own duration — draws the frame cover-cropped into a static canvas, and signals readiness viadata-screenshot-pending.<video>element never enters the DOM (nothing animates between settle and shot), one draw into a static canvas — so unchanged bytes byte-hash to the same poster across reindexes.Test plan
Realm-server e2e (extends the file-capture suite): writes the licensed
webm-simple.webmfixture (VP8/9 decodes in every Chromium build), asserts the jpeg poster manifest entry and that the prerendered fitted HTML embeds the durable poster URL. CI-validated (the cached-fixture suite doesn't run locally).🤖 Generated with Claude Code