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only once its own first frame is on its slide.
Where the server had no first frame for a clip, its slide showed the post's still (a kept frame or the post's picture) and swapped it for the clip's first frame when one came — often a different picture, and the swap jarred (Adam, 2026-10-17: "i don't want to show posters and then switch to the first frame because sometimes the poster and first frame were not the same and that was jarring. could we just always wait until we have a non-black frame before including the video in the pager?"). Now such a clip gets no picture at all and waits out of the carousel until its first frame is drawn from its cached opening as the clip ahead; one with no frame to be had stays out. The clip tapped to open the pager is unchanged.
tools/pager-first-frame-test.js: the clip without a server frame has no stand-in and waits out of the carousel, then gets its drawn frame. pager-ready-gate, pager-no-poster, pager-eager, pager-loading and pager-swipe-fly pass.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_013ZDf1cyCQLkfjftYhymZAg
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the server's, full size — so no slide comes up black.
Some slides were black until the player had its frame, then the picture appeared all at once (Adam, 2026-10-16: "i'm still seeing mostly black between some videos and then they suddenly appear when it starts playing"). The frame drawn in the browser (ebaec42) needed the next clip's cached opening, a file led by its index and a host that allows the read — and only the next clip had one at all: not the one before (its player let go on leaving), not a flight's landing, not the clip two along.
vmedia gains /vmedia/first.jpg?u=<clip>: frame 0 itself, longest side 1280 (the player's size), any host, any layout, kept and cached at the CDN like the stills. The pager now gives every slide within three of the reader, the clips ahead and the slide landed on (not the one the pager opened on mid-clip) their clip's first frame: the server's, fetched and decoded aside and put on the slide when ready, so the flick glides onto the very picture the player shows first; a flight's landing slide fetches its frame as the flight sets off. Where the server has none the next clip's frame is drawn here as before, and a clip beyond keeps the post's still — soft, but not black — replaced by a first frame when one comes; never a soft still under the clip on screen. Data Saver is unchanged (posters at build).
pager-first-frame-test (https clips, vmedia answered by interception): the next clip holds the server's frame, asked once; a clip the server has none for keeps the still, then has its frame drawn here once it is the clip ahead; the clip left behind holds its frame for the swipe back and plays again on it. pager-no-poster, pager-eager, pager-seek-hide, pager-swipe-fly, video-tile-poster, video-fallback, pager-controls still pass. vmedia deployed to cs first (first frames of live clips: 47–144 KB, 0.4–1.7 s to make).
Co-Authored-By: Claude Fable 5.1 <[email protected]>
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