Beating Img2Video ghosting: 3 chained 4-second clips beat one 12-second render, twice as fast
Key_Education4018 · reddit · 2026-09-11
The author explains the "ghosting effect" in Img2Video generation: over an 80-frame sequence, tiny deviations (possibly from quantization, temporal consistency, or sampling) propagate through the clip, showing up as ghosting, flickering, texture drift, and progressive loss of detail and object identity. They argue it's better understood as temporal inconsistency/error propagation than linear per-frame error accumulation.
What helped in practice:
- Generate shorter clips instead of requesting too many frames at once
- Lower resolution for longer sequences
- Use models/workflows with better temporal consistency
- Try different LoRAs (some misbehave on long clips / high res)
- Avoid excessive temporal smoothing (it can itself cause ghosting)
Core trick: instead of rendering one 12-second video, render three consecutive 4-second clips, using each clip's last frame as the next clip's reference image. Ghosting and detail loss dropped noticeably—and it was faster too: one 12s render took 20 minutes, three 4s clips took 10 minutes total, likely because shorter temporal windows suit their hardware and workflow better.
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