H3 video editing shows spatial and temporal shifts; FFLF model and lower res fare best in tests
Comfortable-Lab4125 · reddit · 2026-10-11
A user documented alignment problems when editing videos with H3: like the notorious X/Y pixel shift in older Qwen image editing, H3 also introduces temporal offsets.
- Resolution matters: 1024x576 produces the least shift; native 1344x768 (1MP) is acceptable depending on the shot; anything higher consistently shows noticeable spatial and temporal shifts.
- The FFLF (First Frame Last Frame) model is noticeably more accurate than the Reference model, especially at native resolution, consistent across different LoRAs, configs, and full 20+ step sampling.
- The VFX Edit LoRA and inpainting/masks only help marginally. The author is asking for reliable pixel-aligned, temporally stable edits at higher resolutions.
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