[GeiserX]

Problem

On the real library, 0.6.1's strict decode refuses 9 FLACs that have no clean copy on Soulseek today: Beatsteaks - Hail To The Freaks, Diana Ross & The Supremes - Baby Love, Die Toten Hosen - Tage wie diese and - Wannsee, Julieta Venegas - Limón y sal, Radiohead - High and Dry, Scott McKenzie - San Francisco, Simple Plan Feat. Sean Paul - Summer Paradise, and Steve Harley & Cockney Rebel - Make Me Smile. Refusing them means the phone has no copy of those songs at all. That is worse than the one-frame glitch the old release let through.

Changes

• The setting. corrupt_source: skip | encode_anyway, either under settings (for every output) or on one output (overrides the global value). The default is skip, which is exactly the 0.6.1 behaviour.
• What encode_anyway does. The strict run fails and logs the same ERROR lines as today. Then one more encode runs without -xerror and -err_detect crccheck+explode, so ffmpeg conceals the damaged frames. If it works, the copy exists, one WARNING line says it was made from a damaged source, and its manifest row gets kind tolerant. A source that fails even that run stays refused. Timeouts and other non-decode failures get no tolerant run.
• Failure memory. The source is still remembered as failed, so the strict attempt is not repeated on every scan.
• Clean replacement (from the CodeRabbit review). A clean replacement has a new size or modification time. That clears the failure memory, and a plain scan now rebuilds the tolerant copy with the strict encode. Only tolerant rows are rebuilt this way.
• How the caller tells failures apart. atomic_ffmpeg_encode now returns DECODE_ERROR_RC for any failure that printed a decode error, so it can be told from a timeout or a disk error. It takes strict=False for the tolerant run, where only the exit code counts.
• Release files. Version 0.6.2, CHANGELOG entry, and docs for the setting in docs/configuration.md (a "Damaged sources" section), docs/how-it-works.md and config.example.yaml.

Testing

• CI ran in python:3.14-slim with FFmpeg 7.1.5: 435 passed, 0 skipped, 97% coverage. Codecov patch is 96.15% and project 96.32%.
• Both modes:
  • skip runs one strict encode, writes no output, and remembers the source.
  • encode_anyway, set globally or per output, runs one strict encode and exactly one tolerant encode. The tolerant command has no strict flags. The copy is written with manifest kind tolerant, the ERROR is still logged, and exactly one WARNING appears. The source is remembered, and the next scan makes no encode at all.
  • A source that also fails the tolerant run stays refused, with no WARNING. A timeout gets no tolerant run.
• Real file: a FLAC with 400 flipped bytes, on the local ffmpeg 9 and on 7.1 in CI, gets a tolerant AAC and is remembered as failed.
• Red controls: every new test failed against a deliberate break, 21 mutations in all, run with bytecode caching off.
• Ruff: ruff format --check is clean. ruff check still reports the 23 known BLE001/S110 findings and nothing new.

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📝 Walkthrough

Walkthrough

Version 0.6.2 adds a configurable damaged-source policy. The default skips sources that fail strict decoding. The encode_anyway mode retries with FFmpeg error concealment and records successful retries as tolerant. Configuration, encoding, output processing, tests, and release documentation are updated.

Changes

Damaged-source policy

Layer / File(s)	Summary
Configure corrupt-source modes src/audio_transcode_watcher/config.py, tests/test_config.py, config.example.yaml, docs/configuration.md	The global corrupt_source mode defaults to skip. Outputs can override the global value. Unsupported values raise ValueError.
Add tolerant FFmpeg execution src/audio_transcode_watcher/encoder.py, tests/test_encoder.py	The encoder can remove strict decode flags and run in non-strict mode. Tests cover strict decode-error results and non-strict exit-code handling.
Retry damaged sources and record results src/audio_transcode_watcher/sync.py, tests/test_sync.py, docs/configuration.md, docs/how-it-works.md, CHANGELOG.md, docs/ROADMAP.md, README.md, docs/getting-started.md, config.example.yaml, pyproject.toml, src/audio_transcode_watcher/__init__.py	Output processing retries only strict decode failures when the effective mode is encode_anyway. A successful retry logs a warning and creates a tolerant manifest row. Tests cover retry outcomes and failure memory. Release references and documentation are updated for version 0.6.2.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Feature

Merge Risk: 🟡 Moderate · up to 47720

Replacing a damaged source with a clean file can leave the concealed copy in place. Fix the replacement behavior before merging.

Security Architecture Review

Security architecture risk: 🔵 Low · up to 47720

The feature is opt-in and retains bounded execution and atomic output publication. The main design risk is recovery: a previously tolerated output can remain after a clean source becomes available. No introduced security vulnerability was established, but deployment-level exposure remains unverified.

Retained concerns

• Low · reliability · inferred: The new tolerant-output state is not integrated into recovery reconciliation. A changed source mtime clears failure memory, but a non-forced scan still skips an existing tolerant destination instead of replacing it from the clean source. A tolerant transcode from a lossy source also falls outside the manifest kinds recognized for replacement by a later lossless source. This can strand degraded output after source recovery. Watched modification events mitigate the first case by deleting outputs and forcing processing, but do not cover offline changes or ordinary scan reconciliation.

Security review details

Security Blast Radius

• inferred — A party able to supply source audio can cause additional decoding of damaged bytes when an operator has enabled encode_anyway. The added path uses the same FFmpeg invocation authority, configured output destinations, and manifest location. Its inspected effects are local decoding and filesystem writes; the process's effective mount, credential, and environment exposure was not supplied.

Trust Boundaries and Controls

• observed — The tolerance decision comes from validated configuration rather than source metadata. Audio reaches FFmpeg as an argument in a subprocess argument list, without shell execution in the inspected runner. The retry removes strict decode flags but retains the same timeout and atomic publication controls.

Resilience and Maintainability Implications

• observed — Failed tolerant runs use the existing temporary-output cleanup path, while successful runs warn that the copy came from damaged input. Failure memory suppresses repeated strict attempts, and source-processing ownership is released in a finally block. These controls limit repeated work and partial publication but do not reconcile stale tolerant outputs after recovery.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 34.29% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 35 functions across 7 files. (8 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.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: an opt-in concealed copy of damaged sources.

Full details: Docstring Coverage

Explanation

Docstring coverage is 34.29% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 35 functions across 7 files. (8 skipped: 8 unsupported.)

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[codecov]

Codecov Report

❌ Patch coverage is 96.15385% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.32%. Comparing base (6157b6f) to head (e21ff49).

Files with missing lines	Patch %	Lines
src/audio_transcode_watcher/sync.py	90.90%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #44      +/-   ##
==========================================
+ Coverage   96.27%   96.32%   +0.04%     
==========================================
  Files           9        9              
  Lines        1181     1223      +42     
  Branches      223      234      +11     
==========================================
+ Hits         1137     1178      +41     
- Misses         25       26       +1     
  Partials       19       19              

Files with missing lines	Coverage Δ
src/audio_transcode_watcher/__init__.py	100.00% <100.00%> (ø)
src/audio_transcode_watcher/config.py	100.00% <100.00%> (ø)
src/audio_transcode_watcher/encoder.py	94.89% <100.00%> (+0.32%)	⬆️
src/audio_transcode_watcher/sync.py	94.32% <90.90%> (-0.01%)	⬇️

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
Review comments at @src/audio_transcode_watcher/sync.py:
- Line 394: Update the non-forced scan around the tolerant `kind` assignment to
compare each tolerant output’s recorded source state with the current source and
rebuild the output when that state changes, rather than skipping the existing
file. Preserve the existing failure-memory behavior and add a replacement test
covering a changed source modification time.

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ℹ️ Review info

⚙️ Run configuration

• Configuration used: Repository: GeiserX/audio-transcode-watcher/.coderabbit.yaml
• Review profile: CHILL
• Plan: Advanced
• Run ID: e063660e-6c5b-4314-a21e-7366feccdae7

📥 Commits

Reviewing files that changed from the base of the PR and between 6157b6f and 47720b3.

⛔ Files ignored due to path filters (1)

• uv.lock is excluded by !**/*.lock

📒 Files selected for processing (15)

• CHANGELOG.md
• README.md
• config.example.yaml
• docs/ROADMAP.md
• docs/configuration.md
• docs/getting-started.md
• docs/how-it-works.md
• pyproject.toml
• src/audio_transcode_watcher/__init__.py
• src/audio_transcode_watcher/config.py
• src/audio_transcode_watcher/encoder.py
• src/audio_transcode_watcher/sync.py
• tests/test_config.py
• tests/test_encoder.py
• tests/test_sync.py

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