# FaceFusion UI - Complete Feature Guide & Tips

This comprehensive guide explains every section and option in the FaceFusion UI to help you achieve the best results.

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## 📋 Table of Contents
1. [Main Workflow](#main-workflow)
2. [Input Section](#input-section)
3. [Processors](#processors)
4. [Face Detection & Selection](#face-detection--selection)
5. [Face Masking](#face-masking)
6. [Output Settings](#output-settings)
7. [Execution Settings](#execution-settings)
8. [Memory Management](#memory-management)
9. [Tips for Best Results](#tips-for-best-results)

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## Main Workflow

### Basic Steps for Face Swapping
1. **Upload Source** → The face you want to apply
2. **Upload Target** → The image/video to modify
3. **Select Processors** → face_swapper + face_enhancer for best quality
4. **Configure Settings** → Adjust quality and options
5. **Preview** → Check a frame before processing
6. **Start Processing** → Generate final output

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## Input Section

### SOURCE
**Purpose:** Upload the face image or audio file you want to apply to the target.

**Supported Files:**
- **Images:** For face swapping (JPG, PNG, etc.)
- **Audio:** For lip syncing (MP3, WAV, etc.)

**Tips:**
- Use high-quality, well-lit images for best face swap results
- Source face should be frontal or similar angle to target
- Clear facial features produce better swaps

### TARGET
**Purpose:** Upload the base image or video that will be modified.

**Supported Files:**
- **Images:** Single image face swap
- **Videos:** Video face swap/lip sync

**Tips:**
- Higher resolution = better quality but slower processing
- Good lighting on faces improves detection and swap quality
- Videos with stable faces work better than highly dynamic scenes

### OUTPUT PATH
**Purpose:** Specify where the processed result will be saved.

**Tips:**
- Use descriptive filenames to organize your outputs
- Default saves to temp directory - specify custom path for permanent storage

---

## Processors

### PROCESSORS SELECTION
Select one or more AI processors to apply to your content:

#### **face_swapper** ⭐ (Recommended)
- Swaps faces from source to target
- **Best Models:** `inswapper_128`, `blendswap_256`
- **Pixel Boost:** Use `1024x1024` for maximum quality
- Higher resolution = better detail but slower processing

#### **face_enhancer** ⭐ (Recommended)
- Improves face quality and details after swapping
- **Best Models:** `gfpgan_1.4`, `restoreformer_plus_plus`
- **Blend:** 80-100 for strong enhancement
- **Weight:** Adjust for different model variants
- Use together with face_swapper for professional results

#### **lip_syncer**
- Synchronizes lips to audio file
- **Requirements:** Source audio file must be uploaded
- **Best Model:** `wav2lip_gan_96` for quality
- **Weight:** 1.0 for full sync, lower to blend with original

#### **age_modifier**
- Makes faces younger or older
- **Direction:** Negative = younger, Positive = older
- Range: -100 (very young) to +100 (very old)

#### **expression_restorer**
- Restores target's original facial expressions
- **Factor:** 100 = full target expression, 0 = source expression
- Useful to maintain natural emotions after face swap

#### **frame_enhancer**
- Upscales entire frame (not just face)
- **Models:** `real_esrgan_x4` (4x upscale), `ultra_sharp_x4` (sharper)
- Use for low-resolution videos
- Very slow - use only when needed

#### **frame_colorizer**
- Colorizes black & white videos/images
- Multiple artistic styles available

#### **face_editor**
- Manually adjust facial features
- Control eyes, mouth, head rotation, expressions
- Advanced feature for fine-tuning

#### **face_debugger**
- Shows detection boxes, landmarks, scores
- Useful for troubleshooting detection issues

---

## Face Detection & Selection

### FACE DETECTOR
**Purpose:** Detects faces in images/videos for processing.

#### Face Detector Model
- **yolo_face:** Recommended - best accuracy and speed
- **retinaface:** Good alternative

#### Face Detector Size
- **640x640:** Balanced speed and accuracy (recommended)
- **320x320:** Faster but may miss faces
- **1280x1280:** Best accuracy but slower

#### Face Detector Angles
- Enable to detect rotated/tilted faces
- More angles = better detection but slower
- Use when faces aren't upright

#### Face Detector Score
- Confidence threshold (0-1)
- **0.5:** Standard - good balance
- Higher = stricter detection, fewer false positives
- Lower = detect more faces but more false positives

### FACE LANDMARKER
**Purpose:** Detects facial landmarks (eyes, nose, mouth) for accurate alignment.

#### Face Landmarker Model
- Detects 5 or 68 facial points
- Essential for proper face alignment and swapping

#### Face Landmarker Score
- Confidence threshold (0-1)
- **0.5:** Generally works well
- Higher = more accurate landmark detection required

### FACE SELECTOR MODE
**Purpose:** Choose which faces to process in the target.

#### Modes:
- **One:** Process first detected face only
- **Many:** Process all detected faces
- **Reference:** Track specific face across video frames (best for videos)
- **Age/Gender/Race filters:** Target specific demographics

#### Reference Face Distance
- Similarity threshold for reference tracking
- Lower = stricter matching (same person)
- Higher = more lenient matching

**Tips:**
- Use **Reference** mode for videos with multiple people
- Use **One** for single-person content
- Use filters to target specific faces in multi-person scenes

---

## Face Masking

### PURPOSE
Control which parts of the face are swapped and how they blend.

### Face Mask Types

#### **Box**
- Simple rectangular mask around face
- **Blur:** Controls edge softness (0.3-0.5 recommended)
- **Padding:** Expand mask in each direction (top, right, bottom, left)
- Fast and simple

#### **Occlusion**
- Avoids occluded areas (glasses, hands, hair)
- Uses face occluder model
- More natural when face is partially covered

#### **Region**
- Masks specific facial regions
- Uses face parser model
- Select regions: eyes, nose, mouth, skin, etc.

#### **Area**
- Masks by facial areas
- Combine multiple for custom masking

**Tips:**
- Combine mask types for best results
- Increase blur for smoother blending
- Adjust padding if face edges are visible

---

## Output Settings

### IMAGE OUTPUT

#### Output Image Quality (0-100)
- JPEG compression quality
- **90-95:** Recommended for high quality
- **100:** Maximum quality (larger file)
- **70-80:** Good quality, smaller file

#### Output Image Resolution
- Can upscale or downscale from original
- Match source resolution for best quality
- Upscaling beyond 2x may look artificial

### VIDEO OUTPUT

#### Output Video Encoder
- **libx264:** Widely compatible, good quality
- **libx265/hevc:** Better compression, smaller files
- **h264_nvenc:** GPU-accelerated (NVIDIA only)
- **copy:** Preserve original encoding

#### Output Video Preset
- **ultrafast:** Quick but large file
- **fast/medium:** Balanced
- **slow/slower:** Best quality and compression (recommended)
- **veryslow:** Maximum quality, very slow encoding

#### Output Video Quality (0-100)
- **90-95:** Recommended for professional results
- **80-85:** Good quality, reasonable file size
- Higher = better visual quality, larger files

#### Output Video Resolution
- Can upscale or downscale
- Higher resolution requires more processing time
- Match original for best quality/performance ratio

#### Output Video FPS
- **24:** Cinematic look
- **30:** Standard video
- **60:** Smooth motion
- Match original video FPS for best results

### AUDIO OUTPUT (for videos)

#### Output Audio Encoder
- **aac:** Widely compatible, good quality (recommended)
- **libmp3lame:** MP3 format
- **copy:** Preserve original audio

#### Output Audio Quality (0-100)
- **80-90:** CD quality
- **100:** Lossless
- Higher = better sound, larger file

#### Output Audio Volume (0-200%)
- **100:** Original volume
- **<100:** Quieter
- **>100:** Louder (may cause distortion)

---

## Execution Settings

### EXECUTION PROVIDERS
**Purpose:** Choose hardware acceleration for processing.

#### Options:
- **CUDAExecutionProvider:** NVIDIA GPU acceleration (fastest)
- **CoreMLExecutionProvider:** Apple Silicon acceleration
- **CPUExecutionProvider:** CPU only (slowest but always available)

**Tips:**
- Use GPU providers when available for 10-50x speedup
- CPU is very slow but works on any system
- Some models require specific providers

### EXECUTION THREAD COUNT
**Purpose:** Number of parallel processing threads.

**Recommendations:**
- Set to your CPU core count for optimal performance
- Higher = faster but uses more CPU/GPU
- Lower if system becomes unresponsive

### EXECUTION QUEUE COUNT
**Purpose:** Frames each thread processes before returning.

**Recommendations:**
- **1-2:** Recommended for most cases
- Higher = better GPU utilization but more VRAM needed
- Lower = less memory usage

---

## Memory Management

### VIDEO MEMORY STRATEGY
**Purpose:** Balance processing speed vs VRAM usage.

#### Options:
- **Strict:** Low memory usage, slower processing
- **Moderate:** Balanced (recommended)
- **Tolerant:** Faster but uses more VRAM

**Tips:**
- Use Strict if you get out-of-memory errors
- Use Tolerant if you have high-end GPU (12GB+ VRAM)

### SYSTEM MEMORY LIMIT
**Purpose:** Limit RAM usage during processing.

- **0:** No limit
- Set value (in GB) to prevent system crashes
- Useful for systems with limited RAM

---

## Tips for Best Results

### 🌟 Quality Settings (Best Quality)
```
Processors: face_swapper + face_enhancer
Face Swapper Model: inswapper_128
Pixel Boost: 1024x1024
Face Enhancer Model: gfpgan_1.4
Face Enhancer Blend: 80-100
Output Image/Video Quality: 90-95
Video Preset: slow or slower
```

### ⚡ Speed Settings (Faster Processing)
```
Processors: face_swapper only
Face Swapper Model: inswapper_128
Pixel Boost: 512x512 or 768x768
Skip face_enhancer
Output Quality: 80-85
Video Preset: medium or fast
Execution Threads: Max CPU cores
```

### 🎯 Troubleshooting

#### Face Not Detected
- Check face detector score (try lowering to 0.3)
- Enable more detector angles
- Increase detector size to 1280x1280
- Ensure face is visible and well-lit

#### Poor Swap Quality
- Increase pixel boost to 1024x1024
- Add face_enhancer processor
- Use higher output quality (90-95)
- Ensure source and target faces are similar angles

#### Out of Memory Error
- Lower pixel boost to 512x512 or 768x768
- Set video memory strategy to "strict"
- Reduce execution queue count to 1
- Lower output resolution
- Process shorter video segments using trim frame

#### Slow Processing
- Use GPU execution provider (CUDA/CoreML)
- Reduce pixel boost
- Skip face_enhancer for faster processing
- Lower execution thread count
- Use faster video preset (medium/fast)

#### Unnatural Blending
- Increase face mask blur (0.4-0.6)
- Adjust face mask padding
- Enable occlusion mask type
- Lower face enhancer blend

---

## Workflow Examples

### Example 1: High-Quality Photo Face Swap
1. Upload high-resolution source face image
2. Upload target photo
3. Select: face_swapper + face_enhancer
4. Settings:
   - Face Swapper: inswapper_128, 1024x1024
   - Face Enhancer: gfpgan_1.4, blend 90
   - Output Quality: 95
5. Preview result
6. Process

### Example 2: Video Face Swap (Multiple People)
1. Upload source face
2. Upload target video
3. Select: face_swapper + face_enhancer
4. Face Selector: Reference mode
5. Click reference face in gallery
6. Settings:
   - Pixel boost: 1024x1024
   - Video quality: 90
   - Preset: slow
7. Use trim frame to process test segment first
8. Process full video

### Example 3: Lip Sync Video
1. Upload source audio (speech/song)
2. Upload target video
3. Select: lip_syncer + face_swapper (optional)
4. Settings:
   - Lip Syncer: wav2lip_gan_96
   - Weight: 1.0
5. Process

---

## Summary Table

| Feature | Recommended Setting | Purpose |
|---------|-------------------|---------|
| Face Swapper Model | inswapper_128 | Best quality swapping |
| Pixel Boost | 1024x1024 | Maximum detail |
| Face Enhancer | gfpgan_1.4, blend 80 | Improve quality |
| Output Quality | 90-95 | Near-lossless |
| Video Preset | slow/slower | Best compression |
| Execution Provider | CUDA/CoreML | GPU acceleration |
| Face Selector | Reference (videos) | Track specific person |
| Face Mask Blur | 0.3-0.5 | Natural blending |

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**Last Updated:** October 6, 2025

For more information, visit the official FaceFusion documentation.