47 lines
2.3 KiB
Markdown
47 lines
2.3 KiB
Markdown
# 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)
|
||
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).
|
||
|
||
### HIGH (4-5/6 agents agree)
|
||
2. **10s exceeds temporal coherence** — LTX-2.3 degrades after 5-6s. Fix: test at 5s (121 frames).
|
||
3. **linear_quadratic scheduler** — Distilled model is fragile with non-standard schedules. Fix: switch to `simple`.
|
||
4. **Inconsistent guide_strength** — 0.5 on scene 1, 0.7 on others breaks flow. Fix: 0.5 uniform.
|
||
|
||
### MEDIUM (2-3/6 agents agree)
|
||
5. **Audio track enabled with no audio** — AudioVAE NaN risk. Fix: disable audioTrackEnabled.
|
||
6. **Text in prompts** — LTX can't render readable text. Fix: replace with abstract descriptions.
|
||
7. **512×512 square aspect** — LTX prefers widescreen. Fix: 768×512 (requires new frames).
|
||
8. **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`
|