Ltx v2.5 | Audio to Video | fast

Name: Ltx v2.5 | Audio to Video | fast
Brand: LTX
Availability: InStock

Video·ltx-v2.5·by LTX

LTX 2.5 Audio-to-Video Fast creates synchronized videos from short audio clips with optional image or prompt guidance for fast sound-led generation.

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API reference

Runtime (p50): 1m
Estimated price: $0.13 / unit

Call the API

prediction.sh

curl -X POST \
  -H "Authorization: Bearer $EACHLABS_API_KEY" \
  -H "Content-Type: application/json" \
  --data '{
    "model": "ltx-2-5-audio-to-video-fast",
    "version": "0.0.1",
    "input": {
        "prompt": "The woman talks to the camera.",
        "audio_url": "https://cdn-us.eachlabs.ai/defaults/24366f96094f41788a3b30763bbcf697.mp3",
        "image_url": "https://cdn-us.eachlabs.ai/defaults/04267495bdec4f42b5c1a556c1e7053a.png",
        "aspect_ratio": "16:9"
    },
    "webhook_url": ""
}' \
  https://api.eachlabs.ai/v1/prediction/

Documentation8 sections

Overview
Ltx v2.5 | Audio to Video | fast Overview

Ltx v2.5 | Audio to Video | fast is an audio-driven video generation model from LTX, available on each::labs for creators who want synchronized visuals built from short audio clips. It turns sound into motion with optional image or prompt guidance, which makes it useful when timing, rhythm, or voice cues should shape the final clip. In LTX’s 2.5 family, the fast variant is positioned as the speed-focused option and supports audio-to-video generation at 1080p, with landscape and portrait outputs available through the API.

Compared with generic video generators, Ltx v2.5 | Audio to Video | fast stands out for native audio-video alignment, automatic duration handling, and support for higher-resolution output in the fast tier. LTX also describes the family as a model that can generate video and audio jointly, rather than adding sound as a separate post-process.
Capabilities
Capabilities
- Creates audio-to-video clips where motion is aligned to the supplied soundtrack.
- Supports optional prompt guidance to steer subject matter, mood, and scene structure.
- Supports optional image guidance for visual anchoring and reference-led generation.
- Generates in portrait and landscape formats for social and cinematic layouts.
- Offers automatic duration so the clip length can be inferred from the prompt or action.
- Targets higher-resolution output in the fast tier, with the family documented up to 4K.
- Uses a joint audio-video generation approach, which LTX describes as generating both modalities together for tighter sync.
- Has workflows that emphasize faster-than-real-time generation in supported self-hosted setups.
Use cases
Use Cases for Ltx v2.5 | Audio to Video | fast

Creators can turn a short music loop into a stylized social clip by prompting for beat-synced movement. Example: “A solo dancer under stage lights, choreography matching each drum hit, portrait format.” This works well because the model is designed for synchronized audio-to-video generation.

Marketers can generate quick product teasers where sound cues drive lighting changes, camera pushes, or reveal moments. Example: “A luxury watch rotating on black glass, each percussion hit triggers a reflective flash and a subtle zoom.” The fast tier is useful when turnaround matters.

Developers can prototype audio-reactive demo assets for apps, games, or interactive landing pages. Example: “A futuristic interface blooming in response to rising synth tones, clean motion, wide composition.” The model’s optional guidance and automatic duration can reduce manual timing work.

Designers can create concept moodboards with moving imagery for pitches or storyboards. Example: “A calm seaside scene that shifts with soft ambient audio, slow camera drift, cinematic color grade.” This is a good fit when you want the soundtrack to shape pacing and atmosphere.
Tips & tricks
Tips and Tricks

When using Ltx v2.5 | Audio to Video | fast, write prompts that describe motion, scene changes, and the emotional arc of the audio instead of only naming the subject. LTX documents automatic duration support, so letting the model infer length can work well when the pacing of the audio is clear. If you are pairing audio with an image, keep the visual description stable and let the audio define movement.

Use concise prompts with concrete camera language, especially if you want the model to preserve a subject through motion. Avoid overloading the prompt with contradictory style cues. Example prompts: “A neon-lit dancer syncing every movement to a sharp electronic beat, portrait composition, smooth camera drift.” “A product reveal video where each audio cue triggers a precise lighting change around the object.” “A cinematic singer close-up with slow push-in camera motion and expressive face transitions.”
Technical spec
Technical Specifications
- Model family: LTX 2.5 fast, an open-weights video model with audio-to-video support.
- Primary output: synchronized video generated from audio, with optional prompt or image guidance.
- Resolution support: the fast tier is documented as reaching up to 4K overall; audio-to-video is listed at 1080p in the API changelog.
- Aspect ratios: landscape and portrait are supported.
- Duration: automatic duration is supported; LTX also documents clip-length limits that vary by resolution and frame rate.
- Input formats: audio input plus optional prompt or image guidance; some workflows also accept camera motion controls.
- Output formats: video generation with synchronized audio-visual alignment; production workflows also mention HDR and RAW support in the broader family.
- Performance: LTX reports 10-second generation in 23.7 seconds via API for the family, while self-hosted distilled runs can be faster than real time.
Things to be aware of
Things to Be Aware Of

Ltx v2.5 | Audio to Video | fast works best when the prompt, audio, and target format are aligned. Resolution, frame rate, and duration constraints vary, so a combination that works at one setting may not be available at another. LTX also notes that some workflows depend on frame-count rules and divisibility requirements, which can matter in custom pipelines.

Common mistakes include using audio that is too long for the chosen clip length, giving vague motion instructions, or mixing too many style directions in one prompt. The model is strongest when the desired pacing is clear and the visual scene can remain coherent.
Key considerations
Key Considerations

Ltx v2.5 | Audio to Video | fast is best when the audio track is the main creative driver and you want motion to follow rhythm, speech, or sound design. It is a strong fit for short-form content, concept visuals, and rapid iteration, but it is not a substitute for manual editing when exact shot timing or frame-level control is required. LTX’s documentation also shows that duration, resolution, and frame-rate combinations affect what the model can generate, so planning the output format before prompting matters.

For the best balance of quality and speed, use the fast tier when you need higher-resolution output and broader format support, and choose more controlled workflows when you need precise editability or fixed-length sequencing.
Limitations
Limitations

Ltx v2.5 | Audio to Video | fast is not a full editing suite, and it does not guarantee exact frame-accurate control over every beat or gesture. Published materials also show that output limits depend on resolution and frame rate, so maximum duration is not universal across all settings. The model is optimized for short, synchronized clips rather than long narrative sequences.

Like other generative video systems, it may struggle with complex multi-subject scenes, tightly choreographed continuity, or highly specific timing requirements that exceed prompt control.