this post was submitted on 19 Dec 2024
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why do some YouTube videos on lemmy have a thumbnail, while some don't? (lemmy.world)
submitted 4 hours ago* (last edited 3 hours ago) by Cris_Color@lemmy.world to c/fediverse@lemmy.world
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If you go to !videos@lemmy.world and scroll you'll see some of the posts have a youtube thumbnail image, but not all.

I wanna post YouTube videos, but no one seems to engage much without a thumbnail, which makes sense, but I'm not sure what would result in the post actually having a thumbnail

If anyone has advice or guidance I'd appreciate it :) Thanks!

EDIT: so far it seems like it's potentially a combination of what version of lemmy the posters account is running, and how that instance is configured...

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[–] hono4kami@slrpnk.net 8 points 4 hours ago (6 children)

It's because Lemmy can't fetch YouTube thumbnails. I swear it used to fetch thumbnail and title automatically before, hmm

[–] flamingos@feddit.uk 7 points 3 hours ago* (last edited 3 hours ago) (1 children)

It's because YouTube puts a bunch of JavaScript at the start of the file (1MiB) before the opengraph tags and Lemmy only fetches the first 512 KiB (a fix was merged a couple days ago).

[–] hono4kami@slrpnk.net 3 points 3 hours ago* (last edited 3 hours ago)

If you don't put a whopping 1MB of JavaScript in your website, you're doing web development wrong.

/s

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