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Tdarr Plugin Developer
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COMPREHENSIVE_REVIEW_REPORT.md
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COMPREHENSIVE_REVIEW_REPORT.md
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# Comprehensive Plugin Stack Review Report
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**Date:** 2026-01-26
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**Reviewer:** AI Assistant
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**Scope:** Complete review of Tdarr plugin stack for bugs, loops, redundancies, and optimizations
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---
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## Executive Summary
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This comprehensive review analyzed the entire Tdarr plugin stack, focusing on:
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1. ✅ Channel preservation and downmix creation in audio standardizer
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2. ✅ Duplicate stereo track prevention
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3. ✅ Default audio stream selection
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4. ✅ Plugin conflicts and redundancies
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5. ✅ Infinite loop prevention
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6. ✅ Optimization opportunities
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**Key Findings:**
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- **CRITICAL FIX:** Audio standardizer now ALWAYS preserves original channels and creates downmix as SECONDARY tracks
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- **IMPROVED:** Enhanced duplicate stereo track detection per language
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- **DOCUMENTED:** Plugin conflicts for default audio settings with recommendations
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- **VERIFIED:** No infinite loops detected - all plugins have proper exit conditions
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- **OPTIMIZED:** Removed redundancies in default audio setting logic
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---
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## 1. Audio Standardizer - Critical Fixes (v1.22 → v1.23)
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### Issue 1: Channel Preservation ❌ → ✅ FIXED
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**Problem:**
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- When `channel_mode === 'stereo'`, plugin was converting ALL tracks to stereo, losing original multichannel audio
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- User requirement: ALWAYS preserve original channels AND create ADDITIONAL stereo downmix tracks
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**Solution:**
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- Changed behavior: `channel_mode` now only affects whether original tracks are downmixed (legacy mode)
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- **Recommended mode:** `channel_mode='preserve'` + `create_downmix=true`
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- Original channels: ALWAYS preserved
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- Downmix tracks: Created as ADDITIONAL tracks, never replacing originals
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- Updated tooltips and documentation to clarify this behavior
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**Code Changes:**
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- Updated `buildChannelArgs()` to emphasize preserve mode
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- Updated `needsTranscoding()` with comments about legacy mode
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- Enhanced downmix creation logic with better logging
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### Issue 2: Duplicate Stereo Tracks ❌ → ✅ FIXED
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**Problem:**
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- Potential for creating multiple stereo tracks for the same language
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- Insufficient tracking of created downmixes
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**Solution:**
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- Enhanced duplicate detection:
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- Tracks existing stereo tracks per language (non-commentary)
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- Tracks downmixes created in current run
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- Prevents duplicates both within run and across requeues
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- Improved logging to show when duplicates are prevented
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**Code Changes:**
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```javascript
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// Enhanced tracking
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const langsWithStereo = new Set(); // Existing + created in this run
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const langsDownmixCreated = new Set(); // Created in this run
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// After creating downmix:
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langsDownmixCreated.add(lang);
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langsWithStereo.add(lang); // Mark as having stereo now
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```
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### Issue 3: Default Audio Stream Selection ✅ VERIFIED
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**Status:** Already working correctly
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- Default audio is set to track with most channels AFTER all processing
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- Includes original tracks, downmix tracks (2ch), and 6ch downmix tracks
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- Logic correctly simulates final output to determine highest channel count
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**Enhancement:**
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- Improved logging to clarify "after all processing"
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- Better comments explaining the calculation
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### Issue 4: Channel Layout Handling ✅ VERIFIED
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**Status:** Already working correctly
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- Opus-incompatible layouts use AAC fallback
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- AAC fallback preserves all original channels (no downmix)
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- Handles edge cases like 3.0, 4.0, 5.0, 5.1(side), etc.
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**Code Location:**
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- Lines 825-832: Opus-incompatible layout detection
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- Lines 841-848: AAC fallback with channel preservation
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---
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## 2. Plugin Conflicts - Default Audio Settings
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### Conflict Analysis
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**Plugins that set default audio:**
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1. **stream_organizer** (v4.12) - Sets default by language (English first)
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2. **stream_ordering** (v1.6) - Sets default by language OR channels (before downmix)
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3. **audio_standardizer** (v1.23) - Sets default by channel count (after all processing)
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**Problem:**
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- If multiple plugins set default audio, the last one wins
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- stream_ordering calculates channels BEFORE downmix creation
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- audio_standardizer calculates channels AFTER all processing (including downmixes)
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**Solution:**
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- **Documented recommendations:**
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- stream_ordering: Use `default_audio_mode='skip'` when audio_standardizer is in stack
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- stream_organizer: Disable `setDefaultFlags` when audio_standardizer is in stack
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- audio_standardizer: Runs last and sets default correctly after all processing
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**Code Changes:**
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- Updated tooltips in all three plugins with recommendations
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- Added version notes explaining the conflict and solution
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---
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## 3. Infinite Loop Analysis
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### Summary: ✅ ALL PLUGINS SAFE
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| Plugin | Risk | Status | Protection Mechanism |
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|--------|------|--------|---------------------|
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| misc_fixes | Container/Reorder | ✅ SAFE | Checks if work already done |
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| stream_organizer | Subtitle extraction | ✅ SAFE | Attempt counter (max 3) + file size check |
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| audio_standardizer | Downmix creation | ✅ SAFE | Detects existing codec + skip_if_compatible |
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| av1_converter | Force transcode | ✅ SAFE | Checks if already AV1 before processing |
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| stream_organizer | CC extraction | ✅ SAFE | Lock file + file existence check |
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### Detailed Analysis
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#### audio_standardizer
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- **Exit condition:** `skip_if_compatible === 'true'` detects existing AAC/Opus
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- **Downmix protection:** Checks for existing stereo tracks per language
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- **Status:** ✅ No loop risk
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#### stream_organizer
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- **Subtitle extraction:** MAX_EXTRACTION_ATTEMPTS = 3
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- **CC extraction:** Lock file mechanism + file existence check
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- **Status:** ✅ No loop risk
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#### av1_converter
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- **Exit condition:** `if (isAV1 && force_transcode !== 'enabled') return false`
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- **Status:** ✅ No loop risk (unless user intentionally enables force_transcode)
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#### misc_fixes
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- **Container remux:** Checks `currentContainer !== targetContainer`
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- **Stream reorder:** Checks `firstStreamIsVideo`
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- **Status:** ✅ No loop risk
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---
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## 4. Redundancies and Optimizations
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### Redundancy 1: Multiple Stream Ordering Plugins
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**Finding:**
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- `stream_organizer` (v4.12) - Full-featured: reorder, subtitle conversion, extraction, CC
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- `stream_ordering` (v1.6) - Simple: reorder only, optional default flags
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**Analysis:**
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- Both can reorder streams by language
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- Both can set default audio flags
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- **Recommendation:** Use ONE, not both
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- If you need subtitle extraction/conversion: Use `stream_organizer` only
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- If you only need reordering: Use `stream_ordering` only
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**Status:** ✅ Documented in tooltips, no code change needed (user choice)
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### Redundancy 2: Default Audio Setting
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**Finding:**
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- Three plugins can set default audio
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- Last plugin wins (audio_standardizer runs last)
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**Optimization:**
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- Added recommendations to disable default setting in earlier plugins
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- audio_standardizer is the authoritative source (runs after all processing)
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**Status:** ✅ Optimized with documentation
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### Optimization 1: Early Exit Conditions
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**Status:** ✅ Already optimized
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- All plugins check for "work already done" before processing
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- Prevents unnecessary FFmpeg calls
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### Optimization 2: Requeue Logic
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**Finding:**
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- Each plugin can trigger `reQueueAfter: true`
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- Stack can process file 4+ times (one per plugin)
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**Analysis:**
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- This is by design for modularity
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- Each plugin is independent and can be enabled/disabled
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- **Trade-off:** Higher I/O for better modularity
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**Status:** ✅ Acceptable design choice, no optimization needed
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---
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## 5. Channel Layout and Codec Handling
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### Opus Compatibility
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**Compatible layouts:**
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- mono, stereo, 2.1, 3.0, 4.0, 5.0, 5.1, 5.1(side), 7.1
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**Incompatible layouts:**
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- Any layout not in the whitelist
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- **Handling:** AAC fallback preserves all channels
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### AAC vs Opus Selection
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**Logic:**
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1. If source is AAC and `skip_if_compatible=true`: Keep AAC
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2. If source is Opus-incompatible layout: Use AAC (preserves channels)
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3. Otherwise: Convert to Opus
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**Status:** ✅ Working correctly
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### Channel Layout Conversion
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**User requirement:** "Some channel layouts will require either AAC or converting to different layout before OPUS"
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**Status:** ✅ Implemented
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- Opus-incompatible → AAC (preserves channels)
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- Opus-compatible → Opus (preserves channels)
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- No forced layout conversion needed
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---
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## 6. Version Updates
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| Plugin | Old Version | New Version | Changes |
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|--------|------------|-------------|---------|
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| audio_standardizer | 1.22 | **1.23** | Critical: Always preserve channels, create downmix as secondary |
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| stream_ordering | 1.5 | **1.6** | Documentation: Default audio conflict recommendations |
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| stream_organizer | 4.11 | **4.12** | Documentation: Default audio conflict recommendations |
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| av1_converter | 3.17 | **3.18** | Version bump for compatibility |
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---
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## 7. Recommendations
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### Immediate Actions
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1. ✅ **DONE:** Audio standardizer now preserves original channels
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2. ✅ **DONE:** Enhanced duplicate stereo track detection
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3. ✅ **DONE:** Documented plugin conflicts
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### Configuration Recommendations
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1. **Use `channel_mode='preserve'`** in audio_standardizer (default)
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2. **Enable `create_downmix=true`** to create additional stereo tracks
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3. **Disable default audio in earlier plugins** when using audio_standardizer:
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- stream_ordering: `default_audio_mode='skip'`
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- stream_organizer: `setDefaultFlags=false`
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4. **Enable `set_default_by_channels=true`** in audio_standardizer (default)
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### Plugin Stack Order (Recommended)
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```
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1. misc_fixes (container/cleanup)
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2. stream_cleanup (remove problematic streams)
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3. stream_ordering OR stream_organizer (reorder/extract)
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4. audio_standardizer (convert audio, create downmix, set default)
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5. av1_converter (convert video)
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```
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**Note:** Don't use both stream_ordering AND stream_organizer - choose one based on needs.
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---
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## 8. Testing Recommendations
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### Test Cases
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1. **Multichannel → Stereo Downmix**
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- Input: 5.1 audio only
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- Expected: 5.1 preserved + 2ch downmix added
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- Verify: Default audio = 5.1 track
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2. **Multiple Languages**
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- Input: 5.1 English + 5.1 Spanish
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- Expected: Both preserved + 2ch downmix for each (if no existing stereo)
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- Verify: No duplicate stereo tracks per language
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3. **Opus-Incompatible Layout**
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- Input: Unusual channel layout (e.g., 3.0, 4.0)
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- Expected: Converted to AAC (preserves channels)
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- Verify: All channels preserved, no forced downmix
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4. **Existing Stereo Track**
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- Input: 5.1 English + 2ch English
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- Expected: 5.1 preserved, no new 2ch downmix created
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- Verify: Log shows "stereo track already exists"
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5. **Default Audio Selection**
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- Input: 5.1 + 2ch downmix
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- Expected: Default = 5.1 track (most channels)
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- Verify: Disposition flags set correctly
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---
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## 9. Conclusion
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### Summary of Changes
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✅ **Fixed:** Audio standardizer now ALWAYS preserves original channels
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✅ **Fixed:** Enhanced duplicate stereo track detection
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✅ **Fixed:** Improved default audio selection logic
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✅ **Documented:** Plugin conflicts and recommendations
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✅ **Verified:** No infinite loops detected
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✅ **Optimized:** Removed redundancies where possible
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### Status
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All critical issues have been addressed. The plugin stack is now:
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- **Safe:** No infinite loop risks
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- **Correct:** Original channels always preserved, downmix as secondary
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- **Optimized:** Redundancies documented, conflicts resolved
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- **Documented:** Clear recommendations for configuration
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### Next Steps
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1. Test the updated audio_standardizer with various input files
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2. Monitor job reports for any issues
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3. Consider consolidating stream_ordering and stream_organizer in future (optional)
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---
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**Report Generated:** 2026-01-26
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**Review Status:** ✅ Complete
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