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Jorijn van der Graaf
c1b0c29af6
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A 167 MB screen recording uploaded to catbox.moe hit fetch-media.sh's 64 MB
MAX_BYTES, so curl refused it, the entry kept its third-party URL, and e2e
failed "/posts media origin" on a file we had on disk the whole time. Raising
the cap would have papered over it: the mirror step still depends on someone
else's server being up, fast, and still holding the file.
Invert it. tools/publish-media.sh uploads a recording to the media mount under
its content hash BEFORE the post exists and prints the URL to post, and
fetch-media.sh adopts an own-origin URL by rewriting it to /media/<hash> with no
request at all — no size cap, no third party in the build.
Also here, because publishing exposed them:
* Rotation. Phones record 1920x1080 and attach a display matrix rather than
rotating pixels, so an untouched file reports landscape while playing
portrait and width/height reserve exactly the wrong box. publish-media.sh
bakes rotation into the frames; fetch-media.sh swaps the dimensions on a
quarter-turn matrix for anything mirrored straight from a phone.
* Posters. pict-rs will not thumbnail AV1, so a self-hosted video usually
arrives with no poster. publish-media.sh uploads <hash>.poster.webp beside
the video and fetch-media.sh falls back to it — a real thumbnail still wins.
* The workflow comment claiming a file on the mount is never downloaded again
was wrong: the name is the hash of the bytes, so third-party media is
re-fetched every build and only the write is skipped.
Transcoding to AV1 is what makes self-hosting cheap: that clip was 78 s of a
dark room at 17 Mbps, and denoise + AV1 gives the same picture in 15 MB. Note
<video> carries a single src with no fallback, so AV1 excludes Safari < 17;
--raw skips the transcode when that matters.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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