LTX Video 2.5 Measured: 121-Second Single-Pass Generation, Resolution-Duration Equation Derived
Robotman2100 · reddit · 2026-09-20
A Reddit user systematically benchmarked LTX Video 2.5's long-duration generation and derived an equation for an undocumented tradeoff: max duration scales inversely with resolution.
- Root cause is architectural: LTX 2.5 treats space and time as equivalent 3D tokens, with RoPE coordinates defined in seconds rather than frame numbers, so higher resolutions eat into the time budget.
- The full write-up covers the world-model architecture, FPS behavior, degradation patterns, and recommended settings.
- Samples include a 121s candy musical (512×768) and a 51s giant robot clip (512×1536).
Published on Hugging Face: Robotman2100/LTX-Video-2.5-long-duration-analysis.
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