a live transcode has no length and no byte ranges, so the progressive mp4 the player
used could not be seeked — a scrub restarted ffmpeg at a new offset. jellyfin's own
HLS playlist is VOD and spans the whole runtime, so seeking it is a segment request.
hls.js is checked in rather than installed. installs are frozen so that adding a
package is a reviewed act, and a committed file also has no install-time hook, which
is the vector the 2026-08-04 npm worm used. provenance, hashes and the update recipe
are in vendor/README.md; the tarball sha512 matches the registry's published integrity.
the sidecar now overrides VideoBitrate and MaxWidth on the TranscodingUrl jellyfin
hands back, for the same reason progressivePath computes them: jellyfin resolves that
bitrate from MaxStreamingBitrate (~119 Mbit, the ceiling that exists to let a stream
copy through) and sets no width, which asks a CPU-only container to encode 4K.
safari is deliberately not given the m3u8 — segment URIs are relative and would not
carry the ?token=, and it cannot set an Authorization header the way hls.js can.
progressive stays as the fallback for any browser without MSE.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
pastilhasandClaude Opus 5