falAudio to videoComing soon

fal-ai/ltx-2.3-quality/audio-to-video

Name: fal-ai/ltx-2.3-quality/audio-to-video
Brand: fal

fal-ai/ltx-2.3-quality/audio-to-video is an audio to video tool from fal that runs in the background and returns video. Coming soon: listed with its price, not yet open to runs.

This tool is listed but not yet available to run.

Price pending

Pricing

Price pending.

Limits

Runs: In the background
Returns: video
Longest queue wait: 3600s
Run deadline: 1800s
Largest inline input: 1024 KB
Largest input file: 500 MB
Largest output: 4768 MB
Outputs per run: 16

Input

Field	Kind	Default	Description
`prompt` required	text	—	The prompt to guide the audio-driven video generation.
`audio_url` required	URL or file	—	The URL of the audio track that drives generation.
`image_url`	URL or file	—	Optional URL of an image to use as the first frame. When omitted, generation runs from text and audio only.
`match_audio_length`	true or false	true	When enabled, derives the number of frames from the audio duration and frames_per_second. When disabled, uses num_frames.
`num_frames`	number (whole) 9 to 481	121	The number of frames to generate.
`resolution`	JSON	auto	Final output size. 'auto' matches the input image aspect ratio when image_url is provided; otherwise it uses a landscape fallback.
`frames_per_second`	number 1 to 60	24	Frames per second of the generated video.
`num_inference_steps`	number (whole) 8 to 30	15	Number of inference steps. Defaults to 15 and can be increased up to 30.
`guidance_scale`	number 1 to 20	1	Classifier-free guidance scale. The default is tuned for fast, high-quality generation.
`generate_audio`	true or false	true	Whether to include audio in the returned video. When disabled, the final MP4 is returned without an audio track.
`image_strength`	number 0 to 1	0.7	Conditioning strength for the optional first frame. 1.0 keeps the image more strictly; lower values give the model more freedom.
`negative_prompt`	text	color distortion, overexposure, static, blurry details, subtitles, style, artwork, painting, frame, still, dim overall tone, worst quality, low quality, JPEG compression artifacts, ugly, mutilated, extra fingers, poorly drawn hands, poorly drawn face, deformed, disfigured, malformed limbs, fused fingers, motionless frame, cluttered background, three legs, crowded background, walking backwards	The negative prompt to steer generation away from.
`seed`	number (whole)	—	Random seed for reproducibility. If None, a random seed is chosen.
`enable_prompt_expansion`	true or false	true	Whether to enable prompt expansion.
`video_quality`	one of low, medium, high, maximum	high	The quality preset of the generated video.
`video_write_mode`	one of fast, balanced, small	balanced	The write mode of the generated video.

Same request in code

curl https://api.spiral.ai/v1/runs \
  -H "Authorization: Bearer $SPIRAL_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
    "provider": "fal",
    "model": "fal-ai/ltx-2.3-quality/audio-to-video",
    "input": {
      "prompt": "A person facing the camera sings with expressive natural motion, cinematic portrait lighting, realistic facial performance.",
      "audio_url": "https://storage.googleapis.com/falserverless/example_inputs/ltx-2-a2v-input-audio.mp3"
    }
  }'