Wan2.1 VACE Control Video is a guided video-to-video workflow that preserves the motion and timing of a source video while restyling or re-characterizing it with a text prompt and a reference image. It loads Wan2.1 VACE checkpoints (1.3B or 14B) via UNETLoader and VAELoader, encodes your text with CLIPTextEncode, and conditions generation with control signals derived from simple image preprocessing (Canny by default). GetVideoComponents reads frames and FPS from the input clip, and TrimVideoLatent keeps the latent sequence aligned with your chosen frame range and resolution before sampling.

Under the hood, ModelSamplingSD3 configures the expected sampler schedule for Wan2.1 VACE, and KSampler performs denoising on a sequence of video latents assembled by WanVaceToVideo using your control video, prompt, and reference image. VAEDecode converts the final latents back to frames, CreateVideo assembles them at the desired FPS, and you can export either MP4 (SaveVideo) or animated WebP (SaveAnimatedWEBP). An optional CausVid LoRA (LoraLoader) can accelerate or stabilize motion with very low steps, though you may need to tune its strength. The 14B model yields higher fidelity (and supports 720p) but runs slower and uses more VRAM; the 1.3B variant is faster and suited to 480p outputs.