LTX-2.5: FLF2V is a focused ComfyUI workflow for turning two still images—your intended first and last frames—into a single, coherent video. It’s ideal for creating smooth transitions, morphs between subjects, or bridging shots in a sequence when you only have still references. Two LoadImage nodes supply the start and end visuals, which feed into a single LTX-2.5 FLF2V generator node (cf70afc4-5a03-47ce-8210-734b1de6c6bc). The resulting frames are handed to SaveVideo for encoding to a playable clip. A MarkdownNote is included with inline tips.
Under the hood, the LTX-2.5 node leverages Lightricks’ open video generation model and its keyframes-first “Pixel Diffusion” approach to synthesize in-between frames from your bookend images. Typical controls you’ll use are target resolution, number of frames (or duration), frames-per-second, and a random seed for reproducibility. Many builds also expose blending/easing options to bias the motion toward the first or last frame. SaveVideo then encodes the output at your chosen fps (MP4/WebM, depending on your ffmpeg setup).
For best results, match the aspect ratio and general lighting/composition of your two reference images. Larger frame counts and consistent content between the first and last frames usually produce smoother motion. If you see stretching or cropping, pre-crop your inputs to the same size before loading them into the workflow.
API
Use this workflow from code
Every Comfy workflow is a JSON graph. The payload below is this workflow, exactly as ComfyUI runs it — fetch it from the URL, keep it in version control, or load it in ComfyUI and run it node by node.
Run it from TypeScript or Python with the Comfy SDK. The same code targets Comfy Cloud or a ComfyUI you host yourself — only the base URL changes.
// Install (beta)
npm i @comfyorg/sdk
// Run this workflow (TypeScript)
import { Comfy } from "@comfyorg/sdk";
const client = new Comfy({ apiKey: "comfyui-..." });
const wf = await client.workflows.fromFile("workflow_api.json");
const job = await client.run(wf);
await job.getOutputs("<output-node-id>")[0].toFile("output.png");The SDK takes a workflow in API format: open this workflow in ComfyUI and use File → Export Workflow (API).
Comfy Cloud API access requires a plan with an API key.
FAQ
