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