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sam3.1
Supbatomic/sam3.1
sam3.1 is a machine learning model from Supbatomic. Use it for the machine learning task on the model card, and read the license before you ship it in a product. It is set up for sam3. The card lists the license as other.
This is an open mirror of facebook/sam3.1 hosted by Æmotion Studio so that ComfyUI-FFMPEGA and other downstream tools can auto-download the SAM 3.1 multiplex tracker without users having to accept the gated terms one-…
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.pt3.5 GB · 50%
At a glance
- Library
- sam3
- License
- other
- Model type
- sam3_video
- Access
- Public
- Created
- Sep 16, 2026
- Updated
- Sep 16, 2026
- SHA
- e276c559
Base models
Model card
From the Hugging Face model README
SAM 3.1 — AEmotionStudio Mirror
This is an open mirror of facebook/sam3.1
hosted by Æmotion Studio so that
ComfyUI-FFMPEGA and other downstream tools can auto-download the SAM 3.1
multiplex tracker without users having to accept the gated terms one-by-one.
⚠️ License: Use of these weights is governed by the upstream SAM License (Meta). See
LICENSE— you accept those terms by downloading or using the model. This mirror exists solely to make installation ergonomic; it is not a relicensing of the model.
What's here
| File | Size | Notes |
|---|---|---|
sam3.1_multiplex.safetensors | ~3.5 GB | Preferred. Safer, mmap-friendly format. |
sam3.1_multiplex.pt | ~3.5 GB | Upstream .pt format — kept for byte-for-byte parity with facebook/sam3.1. |
tokenizer.json, vocab.json, merges.txt, *config*.json | small | BPE / processor files SAM 3.1 needs at load time. |
SAM 3.1 highlights vs SAM 3
- New multiplex tracker — joint multi-object tracking via shared memory.
- ~7× faster on multi-object video (~32 FPS vs. ~16 FPS for 128 objects).
- ~½ the VRAM (8 GB → 4 GB in FP16) on the same scenes.
- Unchanged image-detection model — the gains are entirely in the video path.
Direct use
from sam3.model_builder import build_sam3_multiplex_video_model
model = build_sam3_multiplex_video_model(
checkpoint_path="/path/to/sam3.1_multiplex.pt",
load_from_HF=False,
device="cuda",
)
Requires sam3 from git+https://github.com/facebookresearch/sam3.git (a
revision new enough to include build_sam3_multiplex_video_model).
ComfyUI-FFMPEGA
ComfyUI-FFMPEGA auto-downloads from this mirror first and falls back to
facebook/sam3.1 if the mirror is unreachable. Pick sam_version="sam3.1"
on the Effects Builder or Load Video Path node to use it.
Upstream
- Code: https://github.com/facebookresearch/sam3
- Original weights: https://huggingface.co/facebook/sam3.1
- Paper / blog: see the upstream repo.
- Library
- sam3
- Type
- sam3_video
- License
- other
- Created
- Sep 16, 2026
- Updated
- Sep 16, 2026