ltx2

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# LTX-2.3 Video Generation

Generate ~5 second video clips from text prompts or images using the LTX-2.3 22B DiT model.
Runs on Modal (A100-80GB). Requires `MODAL_LTX2_ENDPOINT_URL` in `.env`.
LTX-2.5 is a deploy-time opt-in on the same endpoint; see [LTX-2.5 (opt-in)](#ltx-25-opt-in).

## Quick Reference

```bash
# Text-to-video
uv run tools/ltx2.py --prompt "A sunset over the ocean, golden light on waves, cinematic" --output sunset.mp4

# Image-to-video (animate a still image)
uv run tools/ltx2.py --prompt "Gentle camera drift, soft ambient motion" --input photo.jpg --output animated.mp4

# Custom resolution and duration
uv run tools/ltx2.py --prompt "..." --width 1024 --height 576 --num-frames 161 --output wide.mp4

# Fast mode (fewer steps, quicker)
uv run tools/ltx2.py --prompt "..." --quality fast --output quick.mp4

# Reproducible output
uv run tools/ltx2.py --prompt "..." --seed 42 --output reproducible.mp4
```

## Parameters

| Parameter | Default | Description |
|-----------|---------|-------------|
| `--prompt` | (required) | Text description of the video |
| `--input` | - | Input image for image-to-video |
| `--width` | 768 | Video width (divisible by 64) |
| `--height` | 512 | Video height (divisible by 64) |
| `--num-frames` | 121 | Frame count, must satisfy `(n-1) % 8 == 0` |
| `--fps` | 24 | Frames per second |
| `--quality` | standard | `standard` (30 steps) or `fast` (15 steps) |
| `--steps` | 30 | Override inference steps directly |
| `--seed` | random | Seed for reproducibility |
| `--output` | auto | Output file path |
| `--negative-prompt` | sensible default | What to avoid |
| `--lora` | none | Style LoRA preset. Currently: `crt-terminal`. |

## Style LoRAs

Style LoRAs bias the output toward a specific visual aesthetic. They're baked into the Modal image and selected per-request; switching LoRAs rebuilds the server pipeline.

**On an `LTX2_VERSION=2.5` deployment:** the presets below were trained on LTX-2.3. `crt-terminal` was checked on 2.5 (2026-10-12) and does not reproduce its CRT look there: it changes the output, but the result is a photoreal scene with green text. Use a 2.3 deployment for it. Keys that don't match are skipped without an error, so compare any other 2.3 LoRA with 2.3 before relying on it.

### `crt-terminal` — CRT / pixel-art terminals

Base: LTX-2.3 22B, trained by [@lovis93](https://huggingface.co/lovis93/crt-animation-terminal-ltx-2.3-lora) (Apache 2.0).

```bash
# Trigger word is auto-prepended — write the prompt normally
uv run tools/ltx2.py --lora crt-terminal \
  --prompt "a terminal typing out \"\\$ claude --continue\" character by character in glowing green pixel font, scanlines, phosphor glow, low choppy frame rate, hacker mood" \
  --output crt_claude.mp4
```

**What the preset changes:**
- Prepends `crtanim,` to the prompt (the LoRA's trigger word)
- Defaults to 1024×1024, 121 frames (the ratio it was trained on)
- Relaxes the default negative prompt so on-screen text isn't filtered out

**Prompt pattern:** `<CRT aesthetic> → <color palette> → <animation style> → <subject> → <literal text in quotes> → <mood>`. Keep on-screen text to 1–3 words — the model can't render long strings reliably. The LoRA prefers static framing; ask for camera moves explicitly if you want them.

## Valid Frame Counts

`(n - 1) % 8 == 0`: 25 (~1s), 49 (~2s), 73 (~3s), 97 (~4s), **121 (~5s default)**, 161 (~6.7s), 193 (~8s max practical).

## Common Resolutions

| Resolution | Ratio | Notes |
|------------|-------|-------|
| 768x512 | 3:2 | Default, good balance |
| 512x512 | 1:1 | Square, fastest |
| 1024x576 | 16:9 | Widescreen |
| 576x1024 | 9:16 | Portrait/vertical |

## Prompting Guide

LTX-2 responds well to cinematographic descriptions. Layer these dimensions:

- **Camera:** "Slow dolly forward", "Aerial drone shot", "Tracking shot", "Static wide angle"
- **Lighting:** "Golden hour", "Cinematic lighting", "Neon-lit", "Soft diffused light"
- **Motion:** "Timelapse of...", "Slow motion", "Gentle camera drift", "Gradually transitions"
- **Style:** "Shot on 35mm film", "Documentary style", "Clean minimal aesthetic"
- **Negative:** Always implicitly avoids "worst quality, blurry, jittery, watermark, text, logo"

Keep prompts under 200 words. Be specific about the scene.

### Good Prompts

```
# Atmospheric b-roll
"Aerial drone shot slowly flying over turquoise ocean waves breaking on white sand, golden hour sunlight, cinematic"

# Product/tech scene
"Close-up of hands typing on a mechanical keyboard, shallow depth of field, soft desk lamp lighting, cozy atmosphere"

# Abstract background
"Dark moody abstract background with flowing blue light streaks, subtle geometric grid, bokeh particles floating, cinematic tech atmosphere"

# Animate a portrait
"Professional headshot, subtle natural head movement, confident warm expression, studio lighting, shallow depth of field"

# Animate a slide/screenshot
"Gentle subtle particle effects floating across a presentation slide, soft ambient light shifts, very slight camera drift"
```

### Bad Prompts

```
# Too vague
"A cool video"

# Too many competing ideas
"A cat riding a skateboard while juggling fire on the moon during a thunderstorm"

From digitalsamba/claude-code-video-toolkit, MIT.

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