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+# Face Swap Studio - Implementation Complete ✅
+
+## Overview
+
+Face Swap Studio is a complete implementation of MoCha (wavespeed-ai/wan-2.1/mocha) for video character replacement. Users can seamlessly swap faces or characters in videos using a reference image and source video.
+
+## Official Documentation Reference
+
+**WaveSpeed API Documentation**: [https://wavespeed.ai/docs/docs-api/wavespeed-ai/wan-2.1-mocha](https://wavespeed.ai/docs/docs-api/wavespeed-ai/wan-2.1-mocha)
+
+**Model**: `wavespeed-ai/wan-2.1/mocha`  
+**Endpoint**: `https://api.wavespeed.ai/api/v3/wavespeed-ai/wan-2.1/mocha`
+
+## Implementation Summary
+
+### ✅ Backend Implementation
+
+1. **WaveSpeed Client Integration**
+   - Added `face_swap()` method to `VideoGenerator` (`backend/services/wavespeed/generators/video.py`)
+   - Added wrapper method to `WaveSpeedClient` (`backend/services/wavespeed/client.py`)
+   - Handles MoCha API submission and polling
+   - Supports sync mode with progress callbacks
+
+2. **Face Swap Service** (`backend/services/video_studio/face_swap_service.py`)
+   - `FaceSwapService` class for face swap operations
+   - Cost calculation with min/max billing rules
+   - Image and video base64 encoding
+   - File saving and asset library integration
+   - Progress tracking
+
+3. **API Endpoints** (`backend/routers/video_studio/endpoints/face_swap.py`)
+   - `POST /api/video-studio/face-swap` - Main face swap endpoint
+   - `POST /api/video-studio/face-swap/estimate-cost` - Cost estimation endpoint
+   - File validation (image < 10MB, video < 500MB)
+   - Error handling and logging
+
+### ✅ Frontend Implementation
+
+1. **Main Component** (`FaceSwap.tsx`)
+   - Image and video upload with previews
+   - Settings panel (prompt, resolution, seed)
+   - Progress tracking
+   - Result display with download
+
+2. **Components**
+   - `ImageUpload` - Reference image upload component
+   - `VideoUpload` - Source video upload component
+   - `SettingsPanel` - Configuration options
+
+3. **Hook** (`useFaceSwap.ts`)
+   - State management for all face swap operations
+   - API integration
+   - Cost estimation
+   - Progress tracking
+
+4. **Integration**
+   - Added to Video Studio dashboard modules
+   - Added to App.tsx routing (`/video-studio/face-swap`)
+   - Exported from Video Studio index
+
+## API Parameters (Per Official Documentation)
+
+### Request Parameters
+
+| Parameter  | Type    | Required | Default | Range                                   | Description                                                                     |
+| ---------- | ------- | -------- | ------- | --------------------------------------- | ------------------------------------------------------------------------------- |
+| image      | string  | Yes      | \-      | Base64 data URI or URL                   | The image for generating the output (reference character)                      |
+| video      | string  | Yes      | \-      | Base64 data URI or URL                   | The video for generating the output (source video)                               |
+| prompt     | string  | No       | \-      | Any text                                | The positive prompt for the generation                                         |
+| resolution | string  | No       | 480p    | 480p, 720p                              | The resolution of the output video                                             |
+| seed       | integer | No       | -1      | -1 ~ 2147483647                          | The random seed to use for the generation. -1 means a random seed will be used. |
+
+### Response Structure
+
+```json
+{
+  "code": 200,
+  "message": "success",
+  "data": {
+    "id": "prediction_id",
+    "model": "wavespeed-ai/wan-2.1/mocha",
+    "outputs": ["video_url"],
+    "status": "completed",
+    "urls": {
+      "get": "https://api.wavespeed.ai/api/v3/predictions/{id}/result"
+    },
+    "has_nsfw_contents": [false],
+    "created_at": "2023-04-01T12:34:56.789Z",
+    "error": "",
+    "timings": {
+      "inference": 12345
+    }
+  }
+}
+```
+
+## Pricing (Per Official Documentation)
+
+| Resolution | Price per 5s | Price per second | Max Length |
+| ---------- | ------------ | ---------------- | ---------- |
+| **480p**   | **$0.20**    | **$0.04 / s**    | **120 s**  |
+| **720p**   | **$0.40**    | **$0.08 / s**    | **120 s**  |
+
+### Billing Rules
+
+- **Minimum charge:** 5 seconds - any video shorter than 5 seconds is billed as 5 seconds
+- **Maximum billed duration:** 120 seconds (2 minutes)
+
+## Key Features
+
+### 🌟 MoCha Capabilities
+
+- **🧠 Structure-Free Replacement**: No need for pose or depth maps — MoCha automatically aligns motion, expression, and body posture
+- **🎥 Motion Preservation**: Accurately transfers the source actor's motion, emotion, and camera perspective to the target character
+- **🎨 Identity Consistency**: Maintains the new character's facial identity, lighting, and style across frames without flickering
+- **⚙️ Easy Setup**: Works with a single image and a source video — no need for complex preprocessing or rigging
+- **💡 High Realism, Low Effort**: Perfect for film, advertising, digital avatars, and creative character transformation
+
+### 🧩 Best Practices (From Documentation)
+
+1. **Match Pose & Composition**: Keep reference image's camera angle, body orientation, and framing close to target video
+2. **Keep Aspect Ratios Consistent**: Use the same aspect ratio between input image and video
+3. **Limit Video Length**: For best stability, keep clips under 60 seconds — longer clips may show slight quality degradation
+4. **Lighting Consistency**: Match lighting direction and tone between image and video to minimize blending artifacts
+
+## Implementation Details
+
+### Backend Flow
+
+1. User uploads image and video files
+2. Files are validated (size, type)
+3. Files are converted to base64 data URIs
+4. Request is submitted to MoCha API via WaveSpeed client
+5. Task is polled until completion
+6. Video is downloaded from output URL
+7. Video is saved to user's asset library
+8. Cost is calculated and tracked
+
+### Frontend Flow
+
+1. User uploads reference image (JPG/PNG, avoid WEBP)
+2. User uploads source video (MP4, WebM, max 500MB, max 120s)
+3. User configures settings (optional prompt, resolution, seed)
+4. User clicks "Swap Face"
+5. Progress is tracked during processing
+6. Result video is displayed with download option
+
+## File Structure
+
+```
+backend/
+├── services/
+│   ├── wavespeed/
+│   │   ├── generators/
+│   │   │   └── video.py          # Added face_swap() method
+│   │   └── client.py             # Added face_swap() wrapper
+│   └── video_studio/
+│       └── face_swap_service.py  # Face swap service
+└── routers/
+    └── video_studio/
+        └── endpoints/
+            └── face_swap.py      # API endpoints
+
+frontend/src/components/VideoStudio/modules/FaceSwap/
+├── FaceSwap.tsx                  # Main component
+├── hooks/
+│   └── useFaceSwap.ts           # State management hook
+└── components/
+    ├── ImageUpload.tsx          # Image upload component
+    ├── VideoUpload.tsx          # Video upload component
+    ├── SettingsPanel.tsx        # Settings panel
+    └── index.ts                 # Component exports
+```
+
+## API Endpoints
+
+### POST /api/video-studio/face-swap
+
+**Request:**
+- `image_file`: UploadFile (required) - Reference image
+- `video_file`: UploadFile (required) - Source video
+- `prompt`: string (optional) - Guide the swap
+- `resolution`: string (optional, default "480p") - "480p" or "720p"
+- `seed`: integer (optional) - Random seed (-1 for random)
+
+**Response:**
+```json
+{
+  "success": true,
+  "video_url": "/api/video-studio/videos/{user_id}/{filename}",
+  "cost": 0.40,
+  "resolution": "720p",
+  "metadata": {
+    "original_image_size": 123456,
+    "original_video_size": 4567890,
+    "swapped_video_size": 5678901,
+    "resolution": "720p",
+    "seed": -1
+  }
+}
+```
+
+### POST /api/video-studio/face-swap/estimate-cost
+
+**Request:**
+- `resolution`: string (required) - "480p" or "720p"
+- `estimated_duration`: float (required) - Duration in seconds (5.0 - 120.0)
+
+**Response:**
+```json
+{
+  "estimated_cost": 0.40,
+  "resolution": "720p",
+  "estimated_duration": 10.0,
+  "cost_per_second": 0.08,
+  "pricing_model": "per_second",
+  "min_duration": 5.0,
+  "max_duration": 120.0,
+  "min_charge": 0.40
+}
+```
+
+## Status
+
+✅ **Complete**: Face Swap Studio is fully implemented and ready for use.
+
+- ✅ Backend: Complete and integrated with WaveSpeed client
+- ✅ Frontend: Complete with full UI and state management
+- ✅ Routing: Added to dashboard and App.tsx
+- ✅ Documentation: Matches official MoCha API documentation
+
+## Next Steps
+
+1. **Testing**: Test face swap with various image/video combinations
+2. **Duration Detection**: Improve cost calculation by detecting actual video duration
+3. **Error Handling**: Add more specific error messages for common issues
+4. **UI Improvements**: Add tips and best practices directly in the UI
+
+## References
+
+- [WaveSpeed MoCha Documentation](https://wavespeed.ai/docs/docs-api/wavespeed-ai/wan-2.1-mocha)
+- [WaveSpeed MoCha Model Page](https://wavespeed.ai/models/wavespeed-ai/wan-2.1/mocha)