ray
121 lines
4.7 KiB
Markdown
121 lines
4.7 KiB
Markdown
# Plex 1.43.2 Loudness Analysis Debug — Full Investigation
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Session: June 27, 2026. Server: Ubuntu 26.04, Plex 1.43.2.10687-563d026ea, Docker.
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## Investigation Chain
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### 1. Initial complaint: DJ Friendgänger greyed out
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User's Albanian Traditional Music library (section 4, 170 tracks) had sonic analysis enabled and completed per Plex UI, but DJ Friendgänger was greyed out.
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### 2. Server-level diagnostic
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```python
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# GET /:/prefs revealed:
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MusicAnalysisBehavior: scheduled # ✅ correct
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LoudnessAnalysisBehavior: asap # ❌ blocking loudness analysis
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ButlerStartHour: 18
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ButlerEndHour: 20
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```
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**Fix applied:** Set `LoudnessAnalysisBehavior=scheduled`.
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### 3. Database check — loudness data
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```sql
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SELECT COUNT(*) FROM media_parts mp
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JOIN media_items mi ON mi.id = mp.media_item_id
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WHERE mi.library_section_id = 4
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AND mp.extra_data LIKE '%"ma:loudness"%'
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-- Result: 0 of 170 tracks
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```
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### 4. Activity history — ZERO-WORK pattern
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```sql
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SELECT title, subtitle, started_at, finished_at
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FROM activities WHERE title LIKE '%loudness%' ORDER BY started_at DESC
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-- Result: 5 entries, all 'Butler tasks: LoudnessAnalysis', ALL ZERO-WORK
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```
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### 5. Attempted trigger: butler hours + musicAnalysis toggle
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Set butler to current hour. Toggled musicAnalysis off/on. Butler ran but only processed "Processing 1 albums" — the one album was from section 5 (Club Hits), not section 4.
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### 6. Attempted CLI: `--analyze-loudness`
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```bash
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docker exec plex "Plex Media Scanner" --analyze-loudness --section 4 --loudness-parallelism 8
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# Result: exit 0, no output, no log file created, no loudness data
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docker exec plex "Plex Media Scanner" --analyze-loudness 4 --loudness-parallelism 8
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# Result: exit 0, no output, no log file created, no loudness data
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docker exec plex "Plex Media Scanner" --analyze-loudness --item 18017
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# Result: exit 0, no output, no loudness data
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```
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### 7. Attempted CLI: `--analyze-deeply`
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```bash
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docker exec plex "Plex Media Scanner" --analyze-deeply --section 4
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# Result: exit 0, no output, no log
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docker exec plex "Plex Media Scanner" --analyze-deeply 4
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# Result: exit 0, no output, no log
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```
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### 8. Attempted: HTTP API
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```python
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PUT /library/sections/4/analyze # 200, no effect
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PUT /library/metadata/{id}/analyze # 200 per item, no effect
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```
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### 9. Persistence check — found indexes ARE present
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```bash
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ls "Databases/Music Analysis 4/"
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# Album.tree (121K), Artist.tree (82K), Mapping.db (44K), Track.tree (130K)
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```
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This proved sonic fingerprinting had completed successfully. The "persistence bug" in earlier docs was wrong — indexes ARE persisted, just in binary tree files, not as `sa:` keys.
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### 10. Found gate: `pv:deepAnalysisDate`
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All 170 tracks in section 4 had `pv:deepAnalysisDate: 1781974855` (June 20, 2026) in `media_parts.extra_data`. This timestamp tells Plex "already analyzed."
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### 11. Cleared `pv:deepAnalysisDate` from all 170 tracks
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```python
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# Removed pv:deepAnalysisDate from extra_data via regex replacement
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# 170 tracks updated
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```
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### 12. Restart + butler trigger
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```bash
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docker compose restart plex
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# Set butler hours to current
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# Toggled musicAnalysis off → on for section 4
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```
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### 13. Butler picked up items
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`/activities` showed: "Sonic Analysis: Processing 5 albums" at 0%
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`ps aux` showed: `Plex Media Scanner --analyze-deeply --item 25040`
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### 14. Scanner confirmed running on section 4 item
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Item 25040: "Po e mirë oj nane / Nisja tash me def / Hajde me shuplakë - Live" (section 4)
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Deep Analysis log showed: "Read 10000 packets at 261.198367", "Read 20000 packets at 522.422857"
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### 15. But NO loudness data produced
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After scanner completed:
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- `pv:deepAnalysisDate` updated to new timestamp (1782165677)
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- `ma:loudness`, `ma:gain`, `ma:peak`, `ma:lra` still MISSING
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- Loudness count: 0/170
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## Root Cause Confirmed
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On Plex 1.43.2:
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- `--analyze-deeply` runs, reads files, updates `deepAnalysisDate` — but does NOT compute EBU R128 loudness
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- `--analyze-loudness` is completely non-functional (exit 0, zero effect)
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- The butler only triggers `--analyze-deeply`, never `--analyze-loudness`
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- There is no mechanism to trigger loudness analysis on 1.43.2
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## Key Database State Signals
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| Condition | SQL Check | Meaning |
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|-----------|-----------|---------|
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| Loudness missing | `extra_data NOT LIKE '%ma:loudness%'` | Phase 1 never ran |
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| `deepAnalysisDate` present | `extra_data LIKE '%pv:deepAnalysisDate%'` | Butler skips this item |
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| Sonic indexes exist | Check `Music Analysis {sid}/` dir | Phase 2 completed |
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| ZERO-WORK activities | `started_at = finished_at` | Butler tried but found nothing to do |
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## Summary
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DJ Friendgänger can never work on Plex 1.43.2 because loudness analysis (EBU R128) cannot be triggered through any mechanism. The only fix is downgrading Plex.
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