This ComfyUI workflow builds seamless, text-guided transitions between two source clips using the LTX 2.3 video diffusion model and the SYSTMS FLW transition LoRA. The MODELS group loads the transformer-only LTX 2.3 backbone via DiffusionModelLoaderKJ, the matching VAE with VAELoaderKJ, and applies the FLW LoRA using LoraLoaderModelOnly to bias the model toward natural, flow-like shot changes. Prompts are encoded with CLIPTextEncode (optionally auto-generated by a Gemini node), then routed through LTXVConditioning and LTXVAddGuide to steer the transition content and style.
Under the hood, the workflow allocates a timeline in EmptyLTXVLatentVideo, manages A/V latent streams with LTXVSeparateAVLatent and LTXVConcatAVLatent, and localizes denoising to the handoff region using SolidMask and SetLatentNoiseMask. Sampling is handled by SamplerCustomAdvanced with CFGGuider, KSamplerSelect, BasicScheduler, and RandomNoise for reproducibility. After inference, VAEDecode reconstructs frames and VHS_VideoCombine assembles them into a final video. LTXVCropGuides provides compositional guides to keep subjects aligned between shots, helping the model generate cleaner, more believable morphs.
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.
GET https://comfy.org/workflows/download/d99717df8788.jsonFetching workflow JSON…
Run it from Python or TypeScript with the Comfy SDK. The same code targets Comfy Cloud or a ComfyUI you host yourself — only the base URL changes.
# Install (beta)
pip install comfy-sdk # Python
npm i @comfyorg/sdk # TypeScript
# Run this workflow (Python)
from comfy_sdk import Comfy
client = Comfy(api_key="comfyui-...")
wf = client.workflows.from_file("workflow_api.json")
job = client.run(wf)
for output in job.get_outputs("<output-node-id>"):
output.to_file(output.name)The SDK takes a workflow in API format: open this workflow in ComfyUI and use File → Export Workflow (API). API access requires a Comfy Cloud plan with an API key. SDK docs · Get an API key
FAQ
