LTX-2 Pro Text-to-Video Implementation - Complete ✅

Summary

Successfully implemented Lightricks LTX-2 Pro text-to-video generation following the same modular architecture pattern as HunyuanVideo-1.5.

Implementation Details

1. Service Structure ✅

File: backend/services/llm_providers/video_generation/wavespeed_provider.py

LTX2ProService: Complete implementation
- Model-specific validation (duration: 6, 8, or 10 seconds)
- Fixed 1080p resolution (no resolution parameter needed)
- generate_audio parameter support (boolean, default: True)
- Cost calculation (placeholder - update with actual pricing)
- Full API integration (submit → poll → download)
- Progress callback support
- Comprehensive error handling

2. Key Differences from HunyuanVideo-1.5

Feature	HunyuanVideo-1.5	LTX-2 Pro
Duration	5, 8, 10 seconds	6, 8, 10 seconds
Resolution	480p, 720p (selectable)	1080p (fixed)
Audio	Not supported	`generate_audio` parameter (boolean)
Negative Prompt	Supported	Not supported
Seed	Supported	Not supported
Size Format	width*height (selectable)	Fixed 1080p

3. API Integration ✅

Model: lightricks/ltx-2-pro/text-to-video

Parameters Supported:

✅ prompt (required)
✅ duration (6, 8, or 10 seconds)
✅ generate_audio (boolean, default: True)
❌ negative_prompt (not supported - ignored with warning)
❌ seed (not supported - ignored with warning)
❌ audio_base64 (not supported - ignored with warning)
❌ enable_prompt_expansion (not supported - ignored with warning)
❌ resolution (ignored - fixed at 1080p)

Workflow:

✅ Submit request to WaveSpeed API
✅ Get prediction ID
✅ Poll /api/v3/predictions/{id}/result with progress callbacks
✅ Download video from outputs[0]
✅ Return metadata dict

4. Features ✅

✅ Pre-flight validation: Subscription limits checked before API calls
✅ Usage tracking: Integrated with existing tracking system
✅ Progress callbacks: Real-time progress updates (10% → 20-80% → 90% → 100%)
✅ Error handling: Comprehensive error messages with prediction_id for resume
✅ Cost calculation: Placeholder pricing (update with actual pricing)
✅ Metadata return: Full metadata including dimensions (1920x1080), cost, prediction_id
✅ Audio generation: Optional synchronized audio via generate_audio parameter

5. Validation ✅

LTX-2 Pro Specific:

Duration: Must be 6, 8, or 10 seconds
Resolution: Fixed at 1080p (parameter ignored)
Prompt: Required and cannot be empty
Generate Audio: Boolean (default: True)

6. Factory Function ✅

Updated: get_wavespeed_text_to_video_service()

Model Mappings:

"ltx-2-pro" → LTX2ProService
"lightricks/ltx-2-pro" → LTX2ProService
"lightricks/ltx-2-pro/text-to-video" → LTX2ProService

Usage Example

from services.llm_providers.main_video_generation import ai_video_generate

result = await ai_video_generate(
    prompt="A cinematic scene with synchronized audio",
    operation_type="text-to-video",
    provider="wavespeed",
    model="ltx-2-pro",
    duration=6,
    generate_audio=True,  # LTX-2 Pro specific parameter
    user_id="user123",
    progress_callback=lambda progress, msg: print(f"{progress}%: {msg}")
)

video_bytes = result["video_bytes"]
cost = result["cost"]
resolution = result["resolution"]  # Always "1080p"

Testing Checklist

Test with valid prompt
Test with 6-second duration
Test with 8-second duration
Test with 10-second duration
Test with generate_audio=True
Test with generate_audio=False
Test progress callbacks
Test error handling (invalid duration)
Test cost calculation
Test metadata return
Test that unsupported parameters are ignored with warnings

Next Steps

✅ HunyuanVideo-1.5: Complete
✅ LTX-2 Pro: Complete
⏳ LTX-2 Fast: Pending documentation
⏳ LTX-2 Retake: Pending documentation

Notes

Fixed Resolution: LTX-2 Pro always generates 1080p videos (1920x1080)
Audio Generation: Unique feature - can generate synchronized audio with video
Pricing: Placeholder cost calculation - update with actual pricing from WaveSpeed docs
Unsupported Parameters: negative_prompt, seed, audio_base64, enable_prompt_expansion are ignored with warnings
Polling interval: 0.5 seconds (same as HunyuanVideo-1.5)
Timeout: 10 minutes maximum

Official Documentation

API Docs: https://wavespeed.ai/docs/docs-api/lightricks/ltx-2-pro/text-to-video
Model Playground: https://wavespeed.ai/models/lightricks/ltx-2-pro/text-to-video

Ready for Testing ✅

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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