Add server-side ghost media converter (mp4 -> transparent webm + webp)

Shells out to system ffmpeg with the same luma-key pipeline as ghostify.sh.
Produces a VP9+alpha WebM (browser-decoded primary) and an animated WebP
fallback. No new npm dependency; fails gracefully if ffmpeg is absent.
This commit is contained in:
2026-06-18 14:18:50 +10:00
parent ec4442d4ce
commit 9866e44445
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