wan-flf-video

# WAN 2.2 First-Last-Frame (FLF) Video Workflows ## Overview First-Last-Frame (FLF) video generation takes a start image and an end image and generates a smooth video transition between them. WAN 2.2 I2V (Image-to-Video) 14B model excels at this. ## CRITICAL: Dual Hi-Lo Architecture (REQUIRED) **WAN 2.2 I2V uses a split-noise architecture.** Unlike WAN 2.1, the 2.2 model was trained with separate HighNoise and LowNoise components that handle different denoising ranges. **You MUST use both models in a two-pass KSamplerAdvanced setup.** Using a single model produces low-quality, broken output. - **HighNoise model** (pass 1, steps 0→N/2): Establishes structure, motion, and composition - **LowNoise model** (pass 2, steps N/2→N): Refines details and ensures fidelity to input frames - Both passes share the same conditioning from `WanFirstLastFrameToVideo` - Pass 1 returns noisy latent → Pass 2 continues from there **NEVER use a single KSampler with only one model for WAN 2.2 I2V.** Two native approaches are available: 1. **Native Dual Hi-Lo (Default)** — `WanFirstLastFrameToVideo` + dual `KSamplerAdvanced` two-pass 2. **WanVideoWrapper** — `WanVideoVACEStartToEndFrame` + `WanVideoVACEEncode` + `WanVideoSampler` (VACE, caching, context windows) ## Models ### UNET Pairs (Always load BOTH Hi and Lo) **Remix NSFW (Recommended — built-in lightning, fp16):** | Model | Loader | Notes | |-------|--------|-------| | `Wan2.2_Remix_NSFW_i2v_14b_high_lighting_fp16_v2.1.safetensors` |...