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fix(worker): resolve MB to the original edition + loosen duration gate

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Root cause of albums re-downloading forever despite completing (Linkin Park "Hybrid
Theory"): the MB resolver read the tracklist from an arbitrary releases[0], often a
later reissue/deluxe. HT resolved to a 2023 13-track reissue (~52 min); a complete
2000 12-track download (~38 min) then failed _download_problem's duration gate
(2267s < 2877s×0.85) and fell through peer after peer, never importing.

- _pick_release: choose the ORIGINAL standard edition (Official, earliest date)
  instead of releases[0], so completeness/duration are judged against the edition
  sources actually deliver.
- _DURATION_MIN_RATIO 0.85 -> 0.65: a source legitimately delivering a shorter
  edition than MB's release shouldn't be rejected; only genuinely truncated/preview
  downloads (a fraction of expected runtime) should be.

Together with the est-time peer ranking, this stops the download→reject→re-download
loop. 334 tests pass.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Jonathan
2026-07-20 22:27:44 +02:00
parent d2a86932e0
commit 5f59283bf0
3 changed files with 49 additions and 5 deletions
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worker/lyra_worker/pipeline.py
+4 -2
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@@ -22,8 +22,10 @@ _AUDIO_EXT = {".flac", ".mp3", ".m4a", ".opus", ".ogg", ".aac", ".wav"}
# Reject a download whose total playtime falls below this fraction of MusicBrainz's expected
# total — catches truncated files / preview clips substituted for real tracks that keep the
# track COUNT right. Generous, so edition/encoding differences don't false-positive; bonus
# tracks (over-long) are always fine.
_DURATION_MIN_RATIO = 0.85
# tracks (over-long) are always fine. Kept well below 1.0 because a source legitimately delivers a
# different edition than MB's resolved release (shorter radio edits, no bonus/live tracks), and only
# a genuinely truncated/preview-filled download (playtime a fraction of expected) should be caught.
_DURATION_MIN_RATIO = 0.65
# Cap how many ranked candidates a single job will actually download+verify before giving up.
# Without this, the incomplete-download fall-through can grind through dozens of sources (a popular
# album returns ~200 Soulseek candidates), each a slow attempt that also leaves an abandoned slskd