LTX2.3 vertical video issue

This r/StableDiffusion thread discusses user-reported problems when generating vertical (portrait-orientation) video with the LTX-2.3 model in ComfyUI, such as artifacts, composition drift, and upscaler-related glitches that affect the output quality. Native portrait video (1080×1920) is a new feature in LTX-2.3, trained on actual vertical data rather than cropped landscape footage , but even with native portrait training, the model can drift toward horizontal compositions when prompted with wide-scene language, and users are advised to add explicit vertical anchors in prompts to correct this. Community workarounds discussed include adjusting resolution settings, tuning sigma values, and using multi-stage sampling workflows to mitigate visual artifacts.

LTX2.3 Multi Reference Image Workflow
Does LTX 2.3 have good motion transfer?
ltx 2.3 consistency in comfyui?
LTX2.3 (Distilled) - Updated sigmas for better results (?)
fine-tune LTX 2.3 with his own dataset?
Can I use videos with hardcoded subtitles for LTX training?

Source: r/StableDiffusion | 2026-04-14

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