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Take a thumbnail out of the video when the listed one is gone

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A favorite outlives its thumbnail. Sources sign their CDN paths and the
signature expires, so a video kept months ago has a `thumb` that 404s and
a card that is a grey box with a title under it. Asking the source page
for a fresh picture covers the case where the page still exists; nothing
covered the case where it doesn't.

The video does, because playback re-resolves from the page URL every time.
So once every route to the listed picture is exhausted, a frame a quarter
of the way in becomes the card's picture -- past the black lead-in, and a
fair guess at what the video looks like. It goes through our own proxy, so
the canvas can be read back, is scaled to card width and JPEG'd to a
handful of KB, and is kept: later mounts and later sessions paint it
without a request, instead of asking again for a picture that is known to
be gone.

Only for favorites, once per item, one at a time, and never for a live
stream or a manifest. Two things worth knowing, both found with the
browser rather than reasoned about: a browser fires `seeked` for its own
initial seek to zero, so taking the frame on the first one captures the
opening of every video; and the same item is on screen in more than one
place, so the captures are deduped by a promise rather than the first
asker getting the picture and the rest being told there isn't one.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MPZFnNdHbPGDTqQUNiE4ZN
This commit is contained in:
Simon
2026-10-20 07:33:38 +00:00
parent e8eac70f4d
commit 6dac1028a3
8 changed files with 702 additions and 16 deletions
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4
frontend/js/feed.js
View File

@@ -807,7 +807,7 @@ App.feed = App.feed || {};
</div>
`;
const poster = pane.querySelector('.feed-poster');
App.videos.attachThumbnail(poster, v.thumb, App.videos.sourcePageUrl(v));
App.videos.attachThumbnail(poster, v.thumb, App.videos.sourcePageUrl(v), v);
const slideVideo = pane.querySelector('.feed-video');
bindTimeline(pane, slideVideo);
bindSharedControls(pane, slideVideo, v);
@@ -1584,7 +1584,7 @@ App.feed = App.feed || {};
const titleText = pane.querySelector('.feed-title-text');
if (titleText) titleText.textContent = v.title || '';
const poster = pane.querySelector('.feed-poster');
if (poster) App.videos.attachThumbnail(poster, v.thumb, App.videos.sourcePageUrl(v));
if (poster) App.videos.attachThumbnail(poster, v.thumb, App.videos.sourcePageUrl(v), v);
loadSlideSource(pane, v, true);
setPipMetadata(v);
};