Stable Video Diffusion (img2vid-XT) (stable-video-diffusion family)
Parameters: 1.5 B (active:  B)
Mixture-of-experts: no
Release: 2023-11
Modality: video
Model license: Stable Video Diffusion Community License (commercial use: conditional)
License note: Non-commercial research by default; commercial use requires a Stability AI license.
Architecture: unet (backbone 1.5 B)
Backbone size (GB by quant):
fp16: 9.56
Additional components: name: CLIP image encoder
fp16_gb: 0.5
offloaded: no
VAE size: 0.5 GB
Default output: 1024×576, 25 frames (~4 s)
Recommended setup: gb: 8
quant: fp16 + offload
Memory without offload: 22 GB; offload floor: 8 GB
Device classes: mac, nvidia, amd
Tools: ComfyUI, Diffusers
Notes: Stability's image-to-video model (~1.5B UNet): you feed it a still image, not a text prompt. The distributed svd_xt.safetensors is a single 9.56GB checkpoint that bundles the UNet, the temporal VAE and the CLIP image encoder, so its file size is larger than the UNet parameter count alone implies. With model CPU offload, feed-forward chunking and a small decode chunk size, the diffusers docs put it under 8GB for 25 frames at 1024x576; a straightforward run is ~14-22GB. There is no text encoder (it conditions on CLIP image embeddings). Community License: non-commercial by default, commercial needs Stability approval. Sources: Stability card, diffusers SVD guide.