Custom node extends H3 videos infinitely in latent with no quality loss
SIR_NVAX_A_LOT · reddit · 2026-10-03
The author continues testing a custom ComfyUI node that extends, prepends, or bridges H3 video generations in latent space. This round adds 10 new windows one at a time; the key trick is joining the existing latent with the new latent and decoding in a single pass—two separate encodes stitched together would show visible seams like color shift and luma darkening.
- If you lack a native latent, you can convert pixel video to latent and extend from there
- Limitations: velocity and momentum are hard to control across windows; audio can degrade or drift—fixing in post is the cheapest reliable option, or freeze video and rerun audio with more steps
- Image quality held up across every window with no degradation or burns
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