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Running on Zero
Running on Zero
| title: Video Replace Background | |
| emoji: 🎬 | |
| colorFrom: indigo | |
| colorTo: green | |
| sdk: gradio | |
| sdk_version: 6.29.1 | |
| app_file: app.py | |
| pinned: false | |
| short_description: replace video background with LTX alpha LoRA + H3 inpainting | |
| suggested_hardware: zero-a10g | |
| # Subject on a New Background | |
| Put a video subject on a new, generated background, by chaining two models: | |
| 1. **Lift the subject** with the LTX-2.5 Alpha-Gen matte LoRA (`hugging-apps/ltx-2-5-alpha-matte`), called over the | |
| gradio API: video in, alpha matte + green-screen out. | |
| 2. **Regenerate the background** with MiniMax-H3 ref2va inpainting, held in this Space. The subject is handed to H3 | |
| as conditioning; the inverted matte marks the background as the region to repaint. Text encoding runs on the | |
| `qwen3vl-conditioner` Space, so this one never loads a 60 GiB encoder. | |
| Upload a clip, describe the background, and press **Replace background** - or click one of the examples. **Relight | |
| strength** is the quality lever: at 0 the subject is held exactly (best when the new background's light matches the | |
| original); turn it up and H3 lights the subject into the new scene so it does not read as a cutout, while keeping | |
| identity. | |
| Runs on ZeroGPU with the ref2v turbo LoRA at 8 steps. The matte and conditioner calls bill the caller's ZeroGPU | |
| quota, same as the denoise. |