Pre-generate ONE trickplay sprite (montage JPEG of frames sampled every
library.trickplay.interval, default 10s) + a JSON manifest per file during the
scan/auto-scan prewarm, cached in .unarr next to the media. The web scrubber
shows tiles from it instead of extracting frames live — removing the ffmpeg
contention with the active stream that broke seekbar previews (the original
'no thumbnail' report was the auto-scan prewarm decoding the same file the HLS
transcode was reading, not a seek-index fault).
- config: [library.trickplay] enabled/interval/width (default on, 10s, 240px),
editable + a toggle; IntervalSeconds() with a 10s fallback.
- mediainfo: GenerateTrickplay (one ffmpeg fps=1/interval,scale,tile pass; idle
I/O priority; ceil() frame count so no black trailing tile; a 16.7M-px cap
coarsens the interval for long media so a single sprite stays decodable on
iOS/Safari) + sprite/manifest sidecar cache helpers.
- engine: /trickplay endpoint (manifest JSON, ?kind=sprite JPEG); the agent owns
the tile width so the web requests by path only; thumb:<sha256> token reused.
- prewarm: a trickplay job per item, gated; scan.go + daemon.go wire the config.
Tests: parseDims; synthetic 3x2 / exact-multiple / 1x1; real-file e2e smoke
(S02E08 → 143 tiles, 662KB sprite). Non-breaking: the existing 5-frame panel
prewarm + on-demand /thumbnail stay until the web migrates to the sprite.
Stop treating the absolute path as a file's identity so a base-path change
(host binary→docker remap, moved media folder, remount) no longer makes the
server duplicate and orphan library rows.
- fingerprint.go: ComputeFingerprint = sha256(size ‖ first 1MiB ‖ last 1MiB),
a stable content identity that survives rename/move/base-path change. Cached
in LibraryItem and reused on incremental scans when size+mtime are unchanged.
- sync: send fingerprint + rel_path (relative to the scan root) + agent_id in
the library-sync request, so the server can move a row in place and scope
stale-cleanup per agent.
- daemon: force a FULL re-scan (with a user-facing WARNING) when the scan root
changed since the last cache, so the server re-maps by fingerprint instead of
duplicating. basePathChanged compares filepath.Clean'd roots.
- daemon: relocateUnreachable self-heals a stream request whose path is under an
old root but whose file still exists under a current allowed root, so playback
works immediately without waiting for the re-scan. Conservative: requires a
3-segment tail and re-checks containment after resolving symlinks so it can
neither serve the wrong file nor escape the allowed dirs.
See docs/plans/unarr-path-resilience.md in the web repo.
- ExtractSubtitlesVTTMulti: distrust output when ffmpeg is killed by signal
(45-min timeout on a too-big remux) — a truncated WebVTT passed the len>0
check and got cached as a silently-incomplete track until the media mtime
changed. Skip all output on signal-kill; keep it on a clean non-zero exit.
- stream handlers: read the sidecar cache BEFORE the ffmpegPath guard so a
pre-warmed sub/thumbnail still serves if ffmpeg was removed after the cache
was filled.
- scan: log when the prewarm is skipped because ffmpeg is unavailable (matches
the daemon; CLAUDE.md wants bootstrap to log on every branch).
- unexport sidecarDir/subtitleCachePath/thumbnailCachePath (no external callers).
- prewarm: surface a sample error in the summary so a systemic ffmpeg failure
is distinguishable from one corrupt file.
- add unit tests: codec whitelist, cache paths, mtime freshness, atomic write,
thumb-position dedup.
Pre-extract the file panel's sample frames (10/30/50/70/90% of runtime, w=320)
during the library scan and write-through any on-demand /thumbnail request into
the hidden ".unarr/<name>.t<sec>w<width>.jpg" sidecar. The /thumbnail handler
serves a fresh sidecar instantly, so the characteristics panel and seekbar
previews stop re-running ffmpeg per request.
- mediainfo.sidecar: ThumbnailCachePath, ReadCachedThumbnail, WriteCachedThumbnail,
ExtractThumbnailJPEG (mirrors engine.buildThumbnailArgs).
- library.PrewarmSidecars: also enqueues the panel frame positions (kept in
lockstep with the web's THUMB_FRACTIONS / THUMB_WIDTH) per item with a duration.
- thumbnailHandler: cache-read → hit; miss → extract → write-through.
- config: library.cache_thumbnails (default true) + both cache toggles exposed in
the interactive 'unarr config' library menu.
Local only by design — frames are the user's own content, never uploaded.
On-demand WebVTT extraction re-ran ffmpeg on every /sub request and, for
50GB+ remuxes, couldn't finish a full text track within the 60s HTTP timeout
→ the web player got a 500 and no subtitles.
Extract each text subtitle ONCE — during the library scan (no HTTP deadline,
generous per-file timeout) and write-through on the first on-demand request —
into a hidden ".unarr/<name>.s<index>.vtt" sidecar next to the media file.
The /sub handler serves a fresh sidecar instantly (mtime-invalidated when the
media is replaced), so playback subtitles are instant and huge files work.
- mediainfo.sidecar: cache paths, mtime freshness, atomic write, ExtractSubtitleVTT,
IsTextSubtitleCodec (shared classifier, mirrors engine + web whitelists).
- library.PrewarmSidecars: bounded, idempotent, ctx-cancellable background pass
run after every scan (manual + daemon auto-scan).
- subtitleHandler: cache-read → hit; miss → extract → write-through.
- config: library.cache_subtitles (default true), wired via SetCacheSubtitles.
Local-only by design: nothing extracted is uploaded — the sidecar is the user's
own content, private to their disk.
Cinematic widescreen content (1920×804 at 2.39:1, 3840×1600 21:9, etc.)
was being misclassified: a 1080p source presented as 1920×804 fell to
720p because 804 < 900. Same shape for 2160p sources letterboxed below
2000px tall.
ResolveResolution now takes (width, height) and picks the larger of the
width-derived and height-derived buckets, so anamorphic/letterboxed
sources land in the right bucket.
ResolveScanPaths() collects downloads.dir, organize.movies_dir,
organize.tv_shows_dir, and library.scan_path (if set), then removes
paths that are subdirectories of a parent already in the list.
This ensures the daemon and CLI scan all configured dirs without
relying solely on scan_path being set.
- Migration wizard from Sonarr/Radarr/Prowlarr (unarr migrate) [pre-beta]
- Auto-detect instances via Docker, config files, port scan, Prowlarr
- Import wanted list (monitored+missing movies/series)
- Import download history and blocklist to avoid re-downloading
- Extract debrid tokens from *arr download clients
- Quality profile mapping to preferred_quality config
- DISTINCT ON PostgreSQL query for optimal torrent selection
- JSON export with --dry-run --json (text to stderr, JSON to stdout)
- Media server detection (Plex/Jellyfin/Emby) in unarr init
- Detects library paths and offers them as download directory options
- Debrid auto-configuration in unarr init
- Scans *arr instances for debrid tokens
- Validates and saves via API if user confirms
- New preferred_quality setting in config (2160p/1080p/720p)
- Library scan command (unarr scan) with ffprobe metadata extraction
