# Phase Implementation Overview

## ✅ Completed Phases

### Phase 1: Core Implementation ✅
**Status**: Complete
- ✅ AV1 advanced parameters (preset, CRF, tune, SCD, AQ, TF, lookahead, etc.)
- ✅ Resolution-aware CRF adjustment
- ✅ Maxrate cap for AV1
- ✅ Audio codec conversion (AAC/Opus)
- ✅ Audio channel handling (preserve/stereo/mono)
- ✅ Audio bitrate configuration
- ✅ Stream reordering (English first)
- ✅ Subtitle conversion to SRT
- ✅ Quality presets for audio
- ✅ Opus incompatible layout detection
- ✅ Force transcode flag

### Phase 2: CLI Flags ✅
**Status**: Complete
- ✅ All AV1 advanced flags (10 flags)
- ✅ All audio standardization flags (8 flags)
- ✅ All stream operation flags (7 flags)
- ✅ EncodingOptions struct for structured configuration
- ✅ Flag parsing system
- ✅ Help text updates

### Phase 3: Remaining Features ✅
**Status**: Complete
- ✅ Downmix track creation
- ✅ Subtitle extraction to external files
- ✅ Remove subtitles after extraction
- ✅ Container smart selection (detection and switching)
- ✅ Unsupported stream detection

---

## ⏳ Remaining Work

### Phase 4: Missing Features

#### 4.1 CC Extraction (ccextractor) ⏳
**Status**: NOT Implemented
**Priority**: Low
**Impact**:
- **Time**: +5-10s per file with CC streams
- **Compression**: None
- **File Size**: +50-200KB (external SRT file)
- **Quality**: None
- **Functionality**: Extracts EIA-608/teletext captions to external SRT

**Details**:
- Requires `ccextractor` binary (optional dependency)
- Extracts closed captions from video streams
- Creates external `.cc.srt` file
- Optional: Embed extracted CC back into container

**Implementation Needed**:
- Add `--use-cc-extractor` flag
- Add `--embed-extracted-cc` flag
- Implement `ExtractCC()` function in `encoding/streams.go`
- Check for `ccextractor` availability
- Run `ccextractor` before FFmpeg encoding
- Optionally embed extracted SRT back into output

**Files to Modify**:
- `main.go` - Add CLI flags
- `encoding/streams.go` - Add CC extraction functions
- `EncodingOptions` struct - Add `UseCCExtractor`, `EmbedExtractedCC` fields

---

#### 4.2 Unsupported Stream Exclusion ⏳
**Status**: Partially Implemented (Detection exists, exclusion logic incomplete)
**Priority**: Medium
**Impact**:
- **Time**: Minimal (one-time detection)
- **Compression**: None
- **File Size**: Slightly smaller (removed streams)
- **Quality**: None
- **Functionality**: Prevents muxing errors with problematic streams

**Details**:
- Excludes: EIA-608, CC_DEC, tx3g, bin_data streams
- Only applies when outputting to MKV
- MP4 can handle these streams

**Current Status**:
- ✅ `DetectUnsupportedStreams()` exists in `encoding/streams.go`
- ✅ `IsUnsupportedSubtitle()` exists
- ⏳ Exclusion logic in FFmpeg command building needs verification
- ⏳ Stream mapping needs to skip unsupported streams when outputting to MKV

**Implementation Needed**:
- Verify unsupported streams are excluded from `-map` arguments when outputting to MKV
- Add logging when streams are excluded
- Test with files containing unsupported streams

**Files to Check/Modify**:
- `main.go` - Verify stream mapping excludes unsupported streams for MKV output
- `encoding/streams.go` - May need helper function to filter streams

---

#### 4.3 Container Smart Selection Verification ⏳
**Status**: Implemented, needs testing
**Priority**: Medium
**Impact**:
- **Time**: None
- **Compression**: None
- **File Size**: None
- **Quality**: None
- **Functionality**: Prevents errors with Apple/broadcast streams in MKV

**Details**:
- Detects Apple/broadcast streams (MP4/MOV family)
- Auto-switches to MP4 when unsupported subtitles/data streams detected
- Excludes EIA-608, CC_DEC, tx3g, bin_data streams from MKV

**Current Status**:
- ✅ `GetContainerFormat()` exists
- ✅ `ShouldUseMP4Container()` exists
- ✅ Logic integrated in `main.go` (lines 642-650)
- ⏳ Needs testing with Apple/broadcast format files

**Implementation Needed**:
- Test with MP4/MOV input files
- Test with files containing unsupported streams
- Verify container switching works correctly
- Add user notification when container is switched

---

### Phase 5: Testing & Validation ⏳

#### 5.1 Comprehensive Testing ⏳
**Status**: Not Started
**Priority**: High

**Test Cases Needed**:
1. **AV1 Advanced Options**
   - Test all preset/CRF combinations
   - Test maxrate caps
   - Test resolution adjustments
   - Test disable flags (TF, SCD, AQ)
   - Test 10-bit encoding
   - Test film grain synthesis

2. **Audio Standardization**
   - Test codec conversion (AAC/Opus)
   - Test channel downmix (preserve/stereo/mono)
   - Test downmix creation
   - Test quality presets
   - Test bitrate configurations
   - Test Opus incompatible layouts

3. **Stream Operations**
   - Test stream reordering
   - Test subtitle conversion to SRT
   - Test subtitle extraction
   - Test remove subtitles after extract
   - Test with files containing multiple languages
   - Test with files containing unsupported streams

4. **Container Selection**
   - Test with MP4/MOV input files
   - Test with files containing unsupported streams
   - Test container switching logic

5. **Integration Tests**
   - Test with `testvid.webm` (default settings)
   - Test with various flag combinations
   - Test with files containing subtitles
   - Test with multichannel audio
   - Test with files already in target codec

**Test Scripts**:
- `test_combinations.sh` - Created but needs execution
- `run_tests.sh` - Created but needs execution

**Expected Output**:
- Test results table with:
  - Time taken
  - File size (before/after)
  - Encoding speed
  - Quality metrics (if available)
  - Flag combinations tested

---

#### 5.2 Performance Benchmarks ⏳
**Status**: Not Started
**Priority**: Medium

**Benchmarks Needed**:
- Compare encoding times with/without advanced features
- Measure file size differences
- Test compatibility across players
- Compare quality vs file size tradeoffs
- Test with different video resolutions

---

### Phase 6: Documentation & Polish ⏳

#### 6.1 Documentation Updates ⏳
**Status**: Partial
**Priority**: Medium

**Needed**:
- ✅ Help text updated (Phase 3)
- ⏳ Usage examples in README
- ⏳ Flag reference guide
- ⏳ Quality/speed tradeoff explanations
- ⏳ Troubleshooting guide

#### 6.2 Logging Enhancements ⏳
**Status**: Partial
**Priority**: Low

**Needed**:
- ✅ Stream analysis logging (basic)
- ⏳ Detailed processing summary
- ⏳ Applied adjustments logging (CRF, bitrate, etc.)
- ⏳ Transcoded vs copied streams summary
- ⏳ Container switch notifications

#### 6.3 Error Handling ⏳
**Status**: Partial
**Priority**: Medium

**Needed**:
- ⏳ Better error messages for missing dependencies
- ⏳ Validation of flag combinations
- ⏳ Graceful handling of ccextractor unavailability
- ⏳ Better error messages for unsupported streams

---

## Summary

### ✅ Fully Complete
- Phase 1: Core Implementation
- Phase 2: CLI Flags
- Phase 3: Remaining Features (downmix, extraction, container selection)

### ⏳ Partially Complete / Needs Work
- **CC Extraction**: NOT implemented (low priority)
- **Unsupported Stream Exclusion**: Detection exists, exclusion logic needs verification
- **Container Smart Selection**: Implemented, needs testing
- **Testing**: Scripts created, execution needed
- **Documentation**: Help text done, other docs needed
- **Logging**: Basic logging done, enhancements needed

### 📊 Priority Ranking

**High Priority** (Do Next):
1. Comprehensive testing with various flag combinations
2. Verify unsupported stream exclusion works correctly
3. Test container smart selection with real files

**Medium Priority**:
4. Performance benchmarking
5. Documentation updates
6. Logging enhancements
7. Error handling improvements

**Low Priority**:
8. CC extraction (ccextractor) implementation
9. Advanced logging features

---

## Next Steps

1. **Immediate**: Run comprehensive tests with `testvid.webm` and various flag combinations
2. **Short-term**: Verify unsupported stream exclusion and container selection
3. **Medium-term**: Performance benchmarking and documentation
4. **Long-term**: CC extraction (if needed)

---

## Files Status

### ✅ Complete Files
- `main.go` - Full integration with all features
- `encoding/av1.go` - All AV1 features
- `encoding/audio.go` - All audio features
- `encoding/streams.go` - Stream operations (except CC extraction)

### ⏳ Files Needing Work
- `encoding/streams.go` - Add CC extraction functions
- `main.go` - Verify unsupported stream exclusion
- Test scripts - Execute and document results
- Documentation files - Update with usage examples