🔥 Gemma 4 Prompt Director for LTX 2.3 — Cinematic AI Prompt Engine Workflow

🎬 Overview

This custom ComfyUI node transforms prompt generation into a full cinematic directing system powered by Gemma 4.

Instead of writing basic prompts, this node acts as an AI Director, automatically generating:

• Structured cinematic prompts (LTX 2.3 optimized)

• Timeline-based scenes (perfect for video generation)

• Camera direction, environment, subject behavior

• Sound design layers

• Genre-aware trailer logic (Netflix-style)

Whether you're creating short cinematic clips or full 20-second trailers, this node handles everything — from concept to final prompt.

🚀 Key Features

🎥 Structured Cinematic Prompts

• Clean sections:

  • [Camera]

  • [Environment]

  • [Subject]

  • [Timeline]

  • [Sound]

• Optimized for LTX 2.3 video generation

🎬 Auto Director System

Fully automatic scene creation with multiple modes:

• Smart Auto → balanced, high-quality results

• Full Auto → complete scene generation

• Chaos Auto → maximum creativity & variation

Generates automatically:

• subjects & relationships

• environments

• camera style

• actions & motion

• sound design

🎭 Subject Control

Choose or randomize:

• Female subject

• Male subject

• Hetero couple

• Lesbian couple

• Or let AI decide

🌍 Expanded Environment Database

Massive internal preset library:

• Cinematic interiors

• Urban & nightlife scenes

• Nature & fantasy environments

• Horror & liminal spaces

• Action & disaster setups

Auto-selected or manually controlled.

🎬 Netflix-Style Trailer Mode (NEW)

Generate full 20-second cinematic trailers with:

• 5 structured timeline beats

• Genre-based pacing

• Dynamic camera progression

• Sound design adapted to genre

• Final hook shot

Supported Genres:

• Psychological Horror

• Sci-Fi Thriller

• Action Spectacle

• Dark Fantasy

• Romantic Drama

• Crime / Mystery

• Dystopian / Survival

• And many more

⚙️ Style Presets

Structured modes include:

• Structured Romance

• Structured Power

• Structured Action

• Structured Horror

• Structured Dreamlike

• Structured Realism

• Structured POV

• Structured Epic

• Structured Minimal

🧠 Why This Node?

This is not just a prompt generator.

It is a:

👉 Cinematic Prompt Engine
👉 AI Scene Director
👉 Video Pre-Production Tool

Designed specifically for:

• LTX 2.3 workflows

• Text-to-video pipelines

• High-end cinematic AI generation

🛠 Installation Guide (Step-by-Step)

1. Download the Node

Download the file:

gemma4_prompt_gen.py

2. Place the File

Move it into:

ComfyUI/custom_nodes/Gemma4Prompt/

If the folder doesn’t exist, create it manually.

3. Verify Structure

Your folder should look like:

ComfyUI/
 └── custom_nodes/
      └── Gemma4Prompt/
           ├── __init__.py
           └── gemma4_prompt_gen.py

⚠️ Do NOT rename __init__.py
⚠️ File name must be exactly: gemma4_prompt_gen.py

4. Install Dependencies

Make sure you have:

• Python 3.10+

• CUDA working (for GPU inference)

• llama.cpp build with CUDA support

5. Setup llama-server

Download a CUDA-enabled build and run:

llama-server.exe -m YOUR_MODEL.gguf -ngl 60 --ctx-size 4096

Make sure it's running on:

http://127.0.0.1:8080

6. Restart ComfyUI

Launch ComfyUI again and check:

• Node appears as Gemma4PromptGen

• No errors in console

7. Load Workflow

Use your existing workflow or connect:

• Instruction input

• Optional environment / subject

• Output prompt → LTX pipeline

⚡ Recommended Settings

🎬 Cinematic Clip

• Mode: AUTO

• Style: Structured

• Auto Director: Smart Auto

🎥 Netflix Trailer

• Style: Trailer

• Genre: Psychological Horror (example)

• Intensity: Balanced or High Impact

• Sound: Auto by Genre

🔥 Full Automatic Generation

• Auto Director: Full Auto

• Subject: Off

• Environment: LLM decides

💡 Final Notes

• Higher token limits = longer, richer prompts

• Structured mode is best for LTX

• Trailer mode is ideal for storytelling

🎯 Result

With this node, you move from:

❌ basic prompts
➡️ to
🔥 AI-directed cinematic storytelling

If you like it, drop a like ⭐
and share your generations — I’d love to see what you create!