balarooty-comfyui-extend/docs/workflow_notes.md

Workflow Notes

Build the workflow one node at a time.

Step 1: Extract Frame

Load workflows/01_extract_frame.json.

Replace LoadImage with any node that outputs an IMAGE batch:

• LTX generated frames
• VHS loaded video frames
• any image batch

Use this for grabbing a first frame, last frame, or mid-frame key image.

Step 2: Extract Tail

Load workflows/02_extract_tail.json.

This is the important piece for Flow-style extension. A single last frame can continue visual identity, but it loses motion context. A short tail segment preserves more action.

Start with:

tail_length = 17

Then feed tail_frames into an LTX continuation or multi-condition workflow as the conditioning media for the next clip.

Step 3: Scene Builder

Load workflows/03_scene_builder.json.

Replace the example LoadImage nodes with completed clip frame batches:

clip_1 = first LTX clip
clip_2 = first extension
clip_3 = second extension

Keep deduplicate_joins = true when each new clip starts from the previous final frame.

Qwen + LTX Structure

Use Qwen to create keyframes:

story prompt -> Qwen Image -> first frame
scene target -> Qwen Image Edit -> last frame

Use LTX to animate:

first frame -> LTX I2V -> clip
clip tail -> LTX continuation -> next clip
start frame + end frame -> LTX first/last frame -> bridge clip

Use these custom nodes to connect the pieces:

LTX clip -> Extract Tail -> next LTX clip
all LTX clips -> Scene Builder -> video combine

Proper LTX Guide Workflow

Use:

workflows/04_ltxflow_first_last_wdc_ltx23.json

This is based on the WhatDreamsCost two-stage LTX 2.3 workflow. The important change is replacing the dynamic LTXSequencer section with:

MultiImageLoader.multi_output
  -> ExtractFrame index 0
  -> First/Last Guide first_frame

MultiImageLoader.multi_output
  -> ExtractFrame index -1
  -> First/Last Guide last_frame

The First/Last Guide node receives the real LTX conditioning, VAE, and latent inputs, then returns updated conditioning and latent outputs to the existing sampler path.

This is the right pattern for first/last frame video. The earlier utility workflows are only tests for our helper nodes.

Qwen Edit To LTX

Use:

workflows/05_qwen_edit_to_ltx_first_last.json

This workflow starts with the official Qwen Image Edit 2511 subgraph:

LoadImage source
LoadImage reference/style/material
  -> Image Edit (Qwen-Image 2511)

Then it hands off to LTXFlow:

source image + Qwen edited image
  -> Qwen Edit Bridge
  -> First/Last Guide
  -> LTX sampler

For a start-to-end transition, keep first_frame_source = source_image.

For animating only the edited scene, set first_frame_source = qwen_edited_image, but that removes the visible transition from original to edited frame.

Current LTX model names used by the workflow:

ltx-2.3-22b-dev-fp8.safetensors
gemma_3_12B_it_fp8_scaled.safetensors
ltx-2.3-22b-distilled-lora-384.safetensors
ltx-2.3-spatial-upscaler-x2-1.1.safetensors

Do not look for ltx-av-step-1751000_vocoder_24K.safetensors; that was from the older reference workflow.