fix(downloads): keep every audio track and subtitle in prepared downloads

[Rhainland]

Problem

Related issue: #1167
Validation tasks: changes #1168 C1-C2; changes Silo-Server/silo-apple#319 C1, C3; changes Silo-Server/silo-android#329 C1-C3

When a movie or episode is downloaded below Original quality, or the device can't play the original file, the server prepares an MP4 for it. That MP4 kept only the first audio track and dropped every embedded subtitle, so offline viewers lost commentary and dub tracks and all subtitles. This change keeps every audio track and the embedded subtitles in prepared downloads.

Approach

• Prepared MP4s map every source audio track in source order, with its language, title and default flag. Transcodes encode each track to stereo AAC. Remuxes copy a track when MP4 can store its codec (AAC, MP3, AC-3, E-AC-3, ALAC) and it shares the primary track's codec or is AAC/MP3; the rest are encoded, so a TrueHD, DTS, or PCM passthrough track doesn't fail the mux.
• SRT and WebVTT subtitles go into the MP4 as timed text. ASS/SSA would lose styling, drawing commands and overlapping lines that way, and MP4 can't hold PGS, so the offline manifest lists those as sidecar files (embedded:{ordinal} refs, format ass or sup, with the track title). The subtitle proxy extracts them from the source through the subtitle cache that streaming already uses. DVD and DVB bitmap subtitles are still not carried.
• The manifest describes the delivered file: audio_tracks by position in the MP4, and selected_audio_track_index keeps the viewer's preference. The audio tracks are recorded on the artifact when it becomes ready (prepared_audio_tracks), so rescanning a replaced source doesn't change the description of a file that was already prepared. A selection that no longer names the same-language track falls back to the file's default.
• New artifacts record a track recipe version and use tracks_v1_* queue states (migration and trigger, following the audio_v2 fence), so older API workers can't claim them. Transcode nodes advertise prepared_tracks_v1; the track plan is part of the prepare request and its execution fingerprint, so an older node's legacy output is rejected rather than served.
• Files without a probed audio track list, and downloads prepared before this change, keep the single-track layout and are described that way.

Client changes: Silo-Server/silo-apple#550 and Silo-Server/silo-android#417.

Validation

• Go build, gofmt, vet and lint-changed: clean. Generated contracts, fixtures, web types, route inventory and local-path checks: current. The API contract diff is additive.

• make test-go: hardware-probe and VideoToolbox tests fail on the macOS test machine, as they do on main, along with TestAdminResourceCapabilitiesAndScope, which also fails on main there. A few jellycompat and playback-handler timing tests failed while three build gates ran in parallel and pass when rerun, on this branch and on main.

• Downloads tests against a migrated Postgres pass, including the new queue-fence test and the round trip of the recorded audio tracks. The migration applies, rolls back and re-applies cleanly, and re-applies after a partial run that already added its columns.

• A real FFmpeg test checks the prepared layout with ffprobe.

• End to end on a local server with both client PRs, on the iOS simulator and an Android emulator played offline:

  • Transcode and remux downloads kept every audio track and subtitle, and audio switching worked.
  • SRT, ASS and PGS rendered.
  • Choosing a version downloaded that file, and original downloads were unchanged.

• Linux verification: changed-line lint and the downloads, downloadprepare, playback, transcode-node, language, queue-metrics and API v2 tests pass. Downloads tests also pass against a fresh, fully migrated Postgres database. The real FFmpeg test passes for transcode and remux output; API fixtures and the contract diff are current and additive.

Risks

• Embedded ASS/PGS sidecars are extracted from the current source when the device fetches them. Replacing or re-probing that source before asset capture can change subtitle references or timing relative to the prepared MP4. The prepared audio inventory is frozen; sidecar bytes are not archived with the artifact.

• The migration adds two columns, new status values and an updated trigger; the down migration maps rows back to the older states.

• Prepared downloads are larger: each extra AAC track adds about 192 kbps.

• If a source is re-probed or moved while its download waits in the queue, the job fails and the download must be retried. Tone-map and audio-downmix downloads already work this way.

• Older app versions still play these files, but they don't offer the extra tracks or the ASS/PGS sidecars.

Checklist

• I read and can explain the complete diff.
• This pull request addresses one concern.

AI Disclosure

• Harness: Claude Code (Claude Agent SDK) in T3 Code; Codex harness in T3 Code (rebase and review follow-up)
• Tool(s): Claude Code; OpenAI Codex CLI 0.155.1 (review); GitHub CLI (rebase and review follow-up)
• Model(s): claude-opus-5-5[1m]; gpt-6-astra (review); gpt-6.1-sol (rebase and review follow-up)
• Involvement: Fully AI-generated, human verified
• Adversarial review: Claude Code's code-review and the Codex CLI reviewer (gpt-6-astra, medium effort) each reviewed the complete server and client diffs twice. They found download queue metrics missing the new statuses, subtitle extraction that could outlast the write timeout and end a truncated file as complete, a silent prepared file for sources without an audio track list, and identical labels for multiple ASS tracks. All four were fixed. A separate simplification review moved sidecar extraction onto the shared subtitle cache.

Note

Keep every audio track and text subtitle in prepared downloads

• Adds a versioned multi-track prepared layout: playback.PlanPreparedTracks plans every probed audio track (per-track copy vs AAC decision) and embeddable text subtitles as MP4 mov_text, with language, title, and disposition metadata.
• Prepared artifacts with a track recipe get their own queue/running/ready states (tracks_v1), a frozen audio inventory stored at completion, and execution-fingerprint-based identity; the schema migration adds track_recipe_version and audio-track JSON columns to download_artifacts.
• Offline manifests now expose all prepared audio tracks in source order and advertise embedded ASS/SSA and PGS subtitles as extracted sidecars, served on demand via Service.ServeSubtitle through the shared subtitle cache.
• Prepared-track requests are routed only to transcode nodes advertising the prepared_tracks_v1 transport feature, and legacy receipts from older nodes are rejected.
• Risk: legacy single-track artifacts keep the old behavior and manifest shape; rollback of 20260928222330_fence_track_recipe_artifact_workers.sql converts track states back to legacy states, and malformed stored audio-track JSON causes artifact reads to fail in scanArtifact.

^{Macroscope summarized 9468ab8.}

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📥 Commits

Reviewing files that changed from the base of the PR and between 034373a and 9468ab8.

📒 Files selected for processing (11)

• contracts/api/v2/fixtures/get_system_info_ok.json
• contracts/api/v2/openapi.json
• docs/architecture/playback-protocol-v3.md
• docs/downloads-api.md
• internal/api/router.go
• internal/downloads/manifest.go
• internal/downloads/service.go
• internal/playback/prepare_file.go
• internal/playback/prepare_tracks.go
• internal/playback/transcode.go
• web/src/api/v2/schema.ts

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📝 Walkthrough

Walkthrough

Prepared downloads now support a versioned layout with multiple audio tracks and supported subtitle tracks. The change carries this layout through artifact queueing and remote transcode execution, then adds prepared audio metadata and embedded subtitle references to offline manifests.

Changes

Prepared multi-track downloads

Layer / File(s)	Summary
Track contract and preparation contracts/api/v2/*, internal/playback/*, internal/lang/*, web/src/api/v2/schema.ts, docs/architecture/playback-protocol-v3.md	API schemas and playback types define prepared audio and subtitle tracks. Playback plans tracks, generates FFmpeg arguments, and writes stream metadata and dispositions. Tests cover planning, argument generation, and FFmpeg output.
Track-recipe artifact lifecycle migrations/sql/*, internal/downloads/artifact*.go, internal/downloads/artifacts.go, internal/downloads/repo.go, internal/workmetrics/queues.go	Artifacts store the track recipe version and prepared audio inventory. The tracks_v1 states are handled in queue operations, recovery, linked-download reconciliation, and queue metrics. Tests cover worker status separation and execution fingerprints.
Remote request and transcode execution internal/downloadprepare/transport.go, internal/downloads/remote_preparer.go, internal/playback/protocol_v3.go, internal/transcodenode/server.go	Requests carry the recipe version and prepared layout. Node selection checks the advertised capability. Transcode nodes validate prepared-track requests and advertise the capability.
Manifest and subtitle delivery internal/downloads/manifest.go, internal/downloads/offline.go, internal/downloads/service.go, internal/api/router.go, internal/apiv2/download_delivery.go, docs/downloads-api.md	Manifests include prepared audio details and supported subtitle sidecars. Embedded subtitle references are parsed and served through the shared subtitle cache. Tests cover manifest output and extraction errors.

Priority: ➖ Normal

Estimated code review effort: 4 (Complex) | ~60 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant NodeAwarePreparer
  participant CapabilityCache
  participant TranscodeNode
  participant PrepareFile
  NodeAwarePreparer->>CapabilityCache: Check prepared_tracks_v1 support
  CapabilityCache-->>NodeAwarePreparer: Return cached node capabilities
  NodeAwarePreparer->>TranscodeNode: Send recipe version and prepared layout
  TranscodeNode->>TranscodeNode: Validate recipe and execution attestation
  TranscodeNode->>PrepareFile: Pass PreparedTracks options

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Suggested reviewers: quick104, neurekadev

Merge Risk: ⚪ Minimal · up to 9468a

The change adds multi-track audio and subtitle handling to prepared downloads, and older downloads keep their single-track layout. No concrete merge-blocking risk was found in the supplied context.

Security Architecture Review

Security architecture risk: 🟡 Moderate · up to 9468a

Download delivery gains a new path for extracting embedded subtitles. Existing access checks remain in place, but a prepared download can describe and serve subtitles from the current source file rather than the source used when its artifact became ready. The effect of source replacement needs to be resolved.

Retained concerns

• Medium · security · inferred: Embedded subtitle references are generated and served from current media-file tracks and path, while the prepared artifact's audio inventory is frozen at readiness. If that source is replaced or reassigned, an existing download can serve subtitle bytes that no longer correspond to its prepared file or authorized content. The security consequence depends on source-identity and reassignment guarantees not established here; the older external-subtitle branch already has a related current-source dependency.

Security review details

Security Blast Radius

• inferred — The independently requestable scope is a subtitle track of a managed download owned by the requesting user, profile, and device, subject to a further content-access check. No arbitrary file-path selection is shown.

Security Findings and Attack Paths

• inferred — A source replaced beneath an existing download could cause its new embedded reference to return a different track or source's bytes. Cross-content disclosure would additionally require a source or cache identity transition not established by the available evidence.

Trust Boundaries and Controls

• observed — Ownership, revocation, and content-access checks precede the embedded extraction sink. The primary download handler also requires an authenticated managed request.

Resilience and Maintainability Implications

• observed — Subtitle-cache fills discard ordinary failed extractions, refuse commits after detected size or mtime changes, and avoid publishing partial entries. Its source identity does not establish content identity when path, size, and mtime are reused.

Hardening Proposals

• proposed — Bind advertised and served sidecars to an immutable prepared-source revision, or verify the media file's content identity and revision before extraction; include that identity in cache invalidation where source paths can be reused.

🚥 Pre-merge checks | ✅ 4 | ❓ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Docstring Coverage	❓ Inconclusive	Docstring coverage is 46.27% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 67 functions across 25 files. (5 skipped:…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and concisely describes the main change: preserving every audio track and subtitle in prepared downloads.
Description check	✅ Passed	The description directly explains the prepared-download problem, implementation, validation, and risks. It is fully related to the changeset.

Full details: Docstring Coverage

Explanation

Docstring coverage is 46.27% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 67 functions across 25 files. (5 skipped: 4 unsupported, 1 too large.)

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @internal/playback/prepare_tracks.go:
- Around line 148-154: Update preparedAudioCopyable so matching the primary
codec permits copying only when that codec is compatible with the MP4 output;
keep AAC and MP3 copyable, and route unsupported primary codecs to AAC encoding.

Review comments at
@migrations/sql/20260928222330_fence_track_recipe_artifact_workers.sql:
- Around line 1-80: Make the `track_recipe_version` column addition in the
`ALTER TABLE public.download_artifacts` statement idempotent by adding it only
if it does not already exist, so rerunning the non-transactional migration can
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📒 Files selected for processing (30)

• contracts/api/v2/fixtures/get_system_info_ok.json
• contracts/api/v2/openapi.json
• docs/architecture/playback-protocol-v3.md
• docs/downloads-api.md
• internal/api/router.go
• internal/apiv2/download_delivery.go
• internal/downloadprepare/transport.go
• internal/downloads/artifact.go
• internal/downloads/artifact_repo.go
• internal/downloads/artifact_repo_test.go
• internal/downloads/artifact_test.go
• internal/downloads/artifacts.go
• internal/downloads/manifest.go
• internal/downloads/manifest_test.go
• internal/downloads/offline.go
• internal/downloads/remote_preparer.go
• internal/downloads/remote_preparer_test.go
• internal/downloads/repo.go
• internal/downloads/service.go
• internal/lang/lang.go
• internal/lang/lang_test.go
• internal/playback/prepare_file.go
• internal/playback/prepare_tracks.go
• internal/playback/prepare_tracks_test.go
• internal/playback/protocol_v3.go
• internal/playback/transcode.go
• internal/transcodenode/server.go
• internal/workmetrics/queues.go
• migrations/sql/20260928222330_fence_track_recipe_artifact_workers.sql
• web/src/api/v2/schema.ts

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Review comments at @internal/api/router.go:
- Around line 2011-2013: Initialize the subtitle cache for downloadSvc even when
playback is disabled and streamHandler is nil. Update the setup around
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[macroscopeapp]

The Validation tasks: line is incomplete. The new embedded-subtitle requests and their streamed failure handling affect server C1/C2; the changed prepared-file layout and larger files also affect the mobile offline-play and constrained-storage cases. Android C2 additionally covers the post-media sidecar-capture path. These task cells are all Not run, so no prior result is being invalidated or unblocked; this is a scope correction.

Suggested fix:

-Validation tasks: changes #1168 C2
+Validation tasks: changes #1168 C1-C2; changes Silo-Server/silo-apple#319 C1, C3; changes Silo-Server/silo-android#329 C1-C3

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