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fix: reliable thumbnail resolution in hqify with async sddefault upgrade #400

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fix: reliable thumbnail resolution in hqify with async sddefault upgrade #400

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d0d2d63
fix(hqify): use hqdefault with async sddefault upgrade
KrX3D Mar 8, 2026
2164210
Merge remote-tracking branch 'upstream/main' into sync/upstream-to-hq…
KrX3D Apr 10, 2026
f881728
Merge pull request #493 from KrX3D/sync/upstream-to-hqify_fix
KrX3D Apr 10, 2026
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31 changes: 17 additions & 14 deletions mods/features/adblock.js
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Original file line number Diff line number Diff line change
Expand Up @@ -341,24 +341,27 @@ function deArrowify(items) {
}
}


function hqify(items) {
for (const item of items) {
if (!item.tileRenderer) continue;
if (item.tileRenderer.style !== 'TILE_STYLE_YTLR_DEFAULT') continue;
if (configRead('enableHqThumbnails')) {
if (!item.tileRenderer.onSelectCommand?.watchEndpoint?.videoId) continue;
if (!item.tileRenderer.header?.tileHeaderRenderer?.thumbnail?.thumbnails?.[0]?.url) continue;
const videoID = item.tileRenderer.onSelectCommand.watchEndpoint.videoId;
const queryArgs = item.tileRenderer.header.tileHeaderRenderer.thumbnail.thumbnails[0].url.split('?')[1];
item.tileRenderer.header.tileHeaderRenderer.thumbnail.thumbnails = [
{
url: `https://i.ytimg.com/vi/${videoID}/sddefault.jpg${queryArgs ? `?${queryArgs}` : ''}`,
width: 640,
height: 480
}
];
}
if (!configRead('enableHqThumbnails')) continue;
const videoID = item.tileRenderer.onSelectCommand?.watchEndpoint?.videoId;
if (!videoID) continue;
// Guard: some home page tiles have no thumbnail yet (lazy-loaded) — skip rather than crash.
const existingUrl = item.tileRenderer.header?.tileHeaderRenderer?.thumbnail?.thumbnails?.[0]?.url;
if (!existingUrl) continue;
// Do NOT carry over query args: the original `sqp` param is a signed token tied to the
// original filename — reusing it on a different filename causes a CDN signature mismatch
// and YouTube returns the grey "not available" placeholder instead of the real thumbnail.
// Start with hqdefault (guaranteed for every video), then async-upgrade to
// sddefault (640x480) if it exists on the CDN. On a TV the JSON parse →
// layout pipeline is slow enough that the HEAD usually resolves in time.
const thumbs = item.tileRenderer.header.tileHeaderRenderer.thumbnail.thumbnails;
thumbs[0] = { url: `https://i.ytimg.com/vi/${videoID}/hqdefault.jpg`, width: 480, height: 360 };
fetch(`https://i.ytimg.com/vi/${videoID}/sddefault.jpg`, { method: 'HEAD' })
.then(res => { if (res.ok) thumbs[0] = { url: `https://i.ytimg.com/vi/${videoID}/sddefault.jpg`, width: 640, height: 480 }; })
.catch(() => {});
}
}

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