2.3 KiB
2.3 KiB
LTX-2.3 Artifact Root Causes — 6-Agent Consensus (2026-07-21)
Full research result from 6 independent agents diagnosing Story 1 "Ghost in the Wire" artifacts.
Methodology
6 agents reviewed the exact technical setup independently:
- Claude Opus 4.8 (SSH print mode, 9 turns)
- Kimi K2.7 Code (kimi-c profile, 30 turns)
- Kimi K2.6 (kimi profile, 30 turns)
- MiniMax M3 (minimax profile, 30 turns)
- GLM-5.2 (glm profile, 30 turns)
- Deep research (research profile, 600 turns, 18 sources including Reddit, GitHub, HuggingFace)
Consensus Findings
CRITICAL (6/6 agents agree)
- LoRA stacking at 1.0+1.0 — Distilled + ID LoRA both at full strength cause interference on faces/hands. Fix: Distilled → 0.7, ID → 0.6 (or drop ID if no audio).
HIGH (4-5/6 agents agree)
- 10s exceeds temporal coherence — LTX-2.3 degrades after 5-6s. Fix: test at 5s (121 frames).
- linear_quadratic scheduler — Distilled model is fragile with non-standard schedules. Fix: switch to
simple. - Inconsistent guide_strength — 0.5 on scene 1, 0.7 on others breaks flow. Fix: 0.5 uniform.
MEDIUM (2-3/6 agents agree)
- Audio track enabled with no audio — AudioVAE NaN risk. Fix: disable audioTrackEnabled.
- Text in prompts — LTX can't render readable text. Fix: replace with abstract descriptions.
- 512×512 square aspect — LTX prefers widescreen. Fix: 768×512 (requires new frames).
- fp8_scaled v1.0 quality — Kijai's v1.1 is better. Fix: model upgrade.
Deep Research Sources (18 total)
Key community sources:
- GitHub #148: End-of-video logo/watermark artifacts (upscaler v1.0 contamination)
- HF Discussion #13: Upscaler sigma fix table by frame count
- Reddit r/StableDiffusion: Skin compression fix (Nearest Exact interpolation)
- Reddit r/StableDiffusion: Deformed bodies / identity drift in I2V
- Reddit r/comfyui: Official workflow vs ComfyUI built-in (prompt ignoring bug)
- Reddit r/StableDiffusion: RL LoRA for coherence (OmniNFT)
- HuggingFace RuneXX: Dev model sampler comparison
- HuggingFace LiconStudio: MSR V2 LoRA for identity preservation
- GitHub #255: Image conditioning does not preserve identity
- GitHub #244: Noise in distilled 1.1 model
- LTX.io blog: Official artifact reduction guide
Full research: ~/workspace/research/results/2026-07-21-ltx-2.3-artifacts.md