# MiniMax H3 Extender 3070 R2V 480p Clip By Clip

## Summary

`MiniMax H3 Extender` optimized for Chris's actual MiniMax lane:
`reference-to-video` first, incremental continuation, and safer `3070`
execution. This variant keeps the extender's validated cache / clip approval
model, but swaps it toward the lighter stack already used by the current local
MiniMax extension masters.

## Status

- `best-current-extender-r2v-safe-start`

## Workflow asset

- `workflow.json`

## Built from

- `models/minimax/minimax-h3-extender-ref2va/`
- upstream repo: `tritant/ComfyUI_MiniMax_H3_Extender`

## Key model stack

- `minimax_h3_ref2va_pruned_w4a8_mixed.safetensors`
- `qwen3vl_32b_heretic_minimax_h3_nvfp4.safetensors`
- `minimax_h3_video_vae_int8_convrot.safetensors`
- `minimax_h3_audio_vae_fp32.safetensors`
- `minimax\minimax_h3_fl2v_lightx2v_turbo_4step_v0.1_comfy.safetensors`

## Main changes

- switched the workflow to `clip_by_clip` so each clip can be generated,
  reviewed, and validated before the chain continues
- reduced the working canvas from `896x576` to `864x480`
- raised the step count from `4` to `5` for a slightly less brittle low-step
  path
- swapped the source stack toward the lighter local stack already used by the
  compact MiniMax continuation masters
- replaced the source demo story with a neutral reusable `R2V` continuation
  starter in `clips_json`

## Why this exists

- the upstream extender logic is genuinely useful, but the shipped example is
  more optimistic than Chris's `3070 / 8 GB` box wants
- Chris's primary MiniMax lane is `reference-to-video`, so the optimized
  variant should open in an `R2V`-friendly continuation shape instead of
  generic batch-generation mode
- `clip_by_clip` plus validation is a better fit than `full_batch` when trying
  to preserve continuity without wasting render time on bad downstream clips

## Notes

- This is the right workflow to test if the goal is "can the extender model be
  useful on the local box?"
- It does not replace the current compact `Contex Loop` extension masters yet;
  it is the best direct `Extender`-style challenger to compare against them.
- Start with one reference image, short `10s` clips, and explicit
  `subject_definitions` blocks before scaling up.