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Kunthawat Greethong
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docs/LTX2_PRO_IMPLEMENTATION_COMPLETE.md
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docs/LTX2_PRO_IMPLEMENTATION_COMPLETE.md
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# LTX-2 Pro Text-to-Video Implementation - Complete ✅
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## Summary
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Successfully implemented Lightricks LTX-2 Pro text-to-video generation following the same modular architecture pattern as HunyuanVideo-1.5.
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## Implementation Details
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### 1. Service Structure ✅
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**File**: `backend/services/llm_providers/video_generation/wavespeed_provider.py`
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- **`LTX2ProService`**: Complete implementation
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- Model-specific validation (duration: 6, 8, or 10 seconds)
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- Fixed 1080p resolution (no resolution parameter needed)
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- `generate_audio` parameter support (boolean, default: True)
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- Cost calculation (placeholder - update with actual pricing)
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- Full API integration (submit → poll → download)
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- Progress callback support
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- Comprehensive error handling
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### 2. Key Differences from HunyuanVideo-1.5
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| Feature | HunyuanVideo-1.5 | LTX-2 Pro |
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|---------|------------------|-----------|
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| **Duration** | 5, 8, 10 seconds | 6, 8, 10 seconds |
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| **Resolution** | 480p, 720p (selectable) | 1080p (fixed) |
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| **Audio** | Not supported | `generate_audio` parameter (boolean) |
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| **Negative Prompt** | Supported | Not supported |
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| **Seed** | Supported | Not supported |
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| **Size Format** | width*height (selectable) | Fixed 1080p |
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### 3. API Integration ✅
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**Model**: `lightricks/ltx-2-pro/text-to-video`
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**Parameters Supported**:
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- ✅ `prompt` (required)
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- ✅ `duration` (6, 8, or 10 seconds)
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- ✅ `generate_audio` (boolean, default: True)
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- ❌ `negative_prompt` (not supported - ignored with warning)
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- ❌ `seed` (not supported - ignored with warning)
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- ❌ `audio_base64` (not supported - ignored with warning)
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- ❌ `enable_prompt_expansion` (not supported - ignored with warning)
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- ❌ `resolution` (ignored - fixed at 1080p)
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**Workflow**:
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1. ✅ Submit request to WaveSpeed API
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2. ✅ Get prediction ID
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3. ✅ Poll `/api/v3/predictions/{id}/result` with progress callbacks
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4. ✅ Download video from `outputs[0]`
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5. ✅ Return metadata dict
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### 4. Features ✅
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- ✅ **Pre-flight validation**: Subscription limits checked before API calls
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- ✅ **Usage tracking**: Integrated with existing tracking system
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- ✅ **Progress callbacks**: Real-time progress updates (10% → 20-80% → 90% → 100%)
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- ✅ **Error handling**: Comprehensive error messages with prediction_id for resume
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- ✅ **Cost calculation**: Placeholder pricing (update with actual pricing)
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- ✅ **Metadata return**: Full metadata including dimensions (1920x1080), cost, prediction_id
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- ✅ **Audio generation**: Optional synchronized audio via `generate_audio` parameter
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### 5. Validation ✅
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**LTX-2 Pro Specific**:
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- Duration: Must be 6, 8, or 10 seconds
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- Resolution: Fixed at 1080p (parameter ignored)
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- Prompt: Required and cannot be empty
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- Generate Audio: Boolean (default: True)
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### 6. Factory Function ✅
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**Updated**: `get_wavespeed_text_to_video_service()`
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**Model Mappings**:
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- `"ltx-2-pro"` → `LTX2ProService`
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- `"lightricks/ltx-2-pro"` → `LTX2ProService`
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- `"lightricks/ltx-2-pro/text-to-video"` → `LTX2ProService`
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## Usage Example
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```python
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from services.llm_providers.main_video_generation import ai_video_generate
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result = await ai_video_generate(
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prompt="A cinematic scene with synchronized audio",
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operation_type="text-to-video",
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provider="wavespeed",
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model="ltx-2-pro",
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duration=6,
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generate_audio=True, # LTX-2 Pro specific parameter
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user_id="user123",
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progress_callback=lambda progress, msg: print(f"{progress}%: {msg}")
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)
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video_bytes = result["video_bytes"]
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cost = result["cost"]
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resolution = result["resolution"] # Always "1080p"
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```
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## Testing Checklist
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- [ ] Test with valid prompt
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- [ ] Test with 6-second duration
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- [ ] Test with 8-second duration
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- [ ] Test with 10-second duration
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- [ ] Test with `generate_audio=True`
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- [ ] Test with `generate_audio=False`
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- [ ] Test progress callbacks
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- [ ] Test error handling (invalid duration)
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- [ ] Test cost calculation
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- [ ] Test metadata return
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- [ ] Test that unsupported parameters are ignored with warnings
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## Next Steps
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1. ✅ **HunyuanVideo-1.5**: Complete
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2. ✅ **LTX-2 Pro**: Complete
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3. ⏳ **LTX-2 Fast**: Pending documentation
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4. ⏳ **LTX-2 Retake**: Pending documentation
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## Notes
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- **Fixed Resolution**: LTX-2 Pro always generates 1080p videos (1920x1080)
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- **Audio Generation**: Unique feature - can generate synchronized audio with video
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- **Pricing**: Placeholder cost calculation - update with actual pricing from WaveSpeed docs
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- **Unsupported Parameters**: `negative_prompt`, `seed`, `audio_base64`, `enable_prompt_expansion` are ignored with warnings
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- **Polling interval**: 0.5 seconds (same as HunyuanVideo-1.5)
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- **Timeout**: 10 minutes maximum
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## Official Documentation
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- **API Docs**: https://wavespeed.ai/docs/docs-api/lightricks/ltx-2-pro/text-to-video
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- **Model Playground**: https://wavespeed.ai/models/lightricks/ltx-2-pro/text-to-video
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## Ready for Testing ✅
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The implementation is complete and ready for testing. All features are implemented following the modular architecture with separation of concerns, matching the pattern established by HunyuanVideo-1.5.
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