Infinitetalk Fast Video to Video Multi | AI Digital Human API

InfiniteTalk Fast Video-to-Video Multi

InfiniteTalk Fast Video-to-Video Multi is the speed-optimized version of InfiniteTalk, creating lip-synced videos for multiple characters at half the cost. Upload a video with two characters and their audio tracks — the model generates accurate lip synchronization with fast processing, perfect for high-volume content production.

Why Choose This?

Fastest processing Speed-optimized for quick turnaround on multi-character lip sync projects.
Half the cost 50% cheaper than the standard version — ideal for high-volume production.
Multi-character lip sync Synchronizes lip motion precisely with audio for two characters simultaneously.
Flexible speaking order Choose meanwhile (simultaneous), left_right, or right_left speaking patterns.
Full-body coherence Captures head movements, facial expressions, and posture changes beyond the lips.
Long-form support Process videos up to 10 minutes in length.

Parameters

Parameter	Required	Description
video	Yes	Source video with two visible characters
left_audio	Yes	Audio track for the left character
right_audio	Yes	Audio track for the right character
prompt	No	Text prompt to guide scene or behavior
order	No	Speaking order: meanwhile, left_right, or right_left
seed	No	Random seed for reproducibility (-1 for random)

How to Use

Upload your video — provide a video clearly showing two people.
Upload left audio — add audio file for the left character.
Upload right audio — add audio file for the right character.
Write prompt (optional) — guide scene, pose, or behavior.
Select speaking order — choose meanwhile, left_right, or right_left.
Run — submit and download your lip-synced video.

Pricing

Duration	Cost
5 s (min)	$0.075
10 s	$0.15
30 s	$0.45
60 s	$0.90
600 s (max)	$9.00

Billing Rules

Rate: $0.015 per second ($0.075 per 5 seconds)
Minimum charge: 5 seconds ($0.075)
Maximum duration: 600 seconds (10 minutes)
Duration calculation:
Sequential (left_right / right_left): left_audio + right_audio
Simultaneous (meanwhile): max(left_audio, right_audio)

Best Use Cases

High-Volume Production — Cost-effective lip sync for large content libraries.
Dialogue Scenes — Create realistic conversations between two characters.
Social Media Content — Quick turnaround for multi-character videos.
Podcast Visuals — Add visual elements to two-person podcast recordings.
Rapid Prototyping — Test concepts before using the standard version.

Pro Tips

Use Fast version for iteration and testing, standard version for final quality.
Ensure both characters are clearly visible in the source video.
Use "meanwhile" for overlapping dialogue or simultaneous speech.
Use "left_right" or "right_left" for sequential conversation flow.
Mask only the regions you want to animate — full image masks result in black output.

Notes

Maximum video length: 10 minutes (600 seconds).
Processing time: faster than standard version.
Mask safety: Do not upload the full image as mask — only cover animatable regions.
Ensure uploaded file URLs are publicly accessible.

Related Models

InfiniteTalk Video-to-Video Multi — Standard version with 720p support.
InfiniteTalk Fast Video-to-Video — Fast single-character version.
InfiniteTalk Fast Multi — Fast multi-character image-to-video.

Reference

Build your own digital human

Infinitetalk Fast Video To Video Multi API — Quick start

Grab a WaveSpeedAI API key, then call POST https://api.wavespeed.ai/api/v3/wavespeed-ai/infinitetalk-fast/video-to-video-multi with your input as JSON. The endpoint returns a prediction id; poll the prediction endpoint until status flips to completed, then read the output URL from data.outputs[0]. Examples for Infinitetalk Fast Video To Video Multi below.

HTTP example

# Submit the prediction
curl -X POST "https://api.wavespeed.ai/api/v3/wavespeed-ai/infinitetalk-fast/video-to-video-multi" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $WAVESPEED_API_KEY" \
  -d '{
    "video": "https://example.com/your-input.mp4",
    "prompt": "A cinematic shot of a city at sunset, soft golden light",
    "order": "meanwhile",
    "seed": -1
}'

# Response includes a prediction id. Poll for the result:
curl -X GET "https://api.wavespeed.ai/api/v3/predictions/{request_id}/result" \
  -H "Authorization: Bearer $WAVESPEED_API_KEY"

# When status is "completed", read the output from data.outputs[0].

Node.js example

// npm install wavespeed
const WaveSpeed = require('wavespeed');

const client = new WaveSpeed(); // reads WAVESPEED_API_KEY from env

const result = await client.run("wavespeed-ai/infinitetalk-fast/video-to-video-multi", {
        "video": "https://example.com/your-input.mp4",
        "prompt": "A cinematic shot of a city at sunset, soft golden light",
        "order": "meanwhile",
        "seed": -1
});

console.log(result.outputs[0]); // → URL of the generated output

Python example

# pip install wavespeed
import wavespeed

output = wavespeed.run(
    "wavespeed-ai/infinitetalk-fast/video-to-video-multi",
    {
    "video": "https://example.com/your-input.mp4",
    "prompt": "A cinematic shot of a city at sunset, soft golden light",
    "order": "meanwhile",
    "seed": -1
}
)

print(output["outputs"][0])  # → URL of the generated output

Infinitetalk Fast Video To Video Multi API — Frequently asked questions

What is the Infinitetalk Fast Video To Video Multi API?

Infinitetalk Fast Video To Video Multi is a WaveSpeedAI model for talking-avatar generation, exposed as a REST API on WaveSpeedAI. InfiniteTalk fast video-to-video multi converts a video and two audio inputs into multi-character talking or singing videos. Ready-to-use REST inference API, best performance, no coldstarts, affordable pricing. You can call it programmatically or try it from the playground above.

How do I call the Infinitetalk Fast Video To Video Multi API?

POST your input parameters to the model's REST endpoint (shown in the API tab of this playground) with your WaveSpeedAI API key in the Authorization header. Submission returns a prediction ID; poll the prediction endpoint until status flips to "completed", then read the output URL from the result. The playground generates a ready-to-paste code sample in Python, JavaScript, or cURL for whatever inputs you've set. Full request/response shape is documented at https://wavespeed.ai/docs/docs-api/wavespeed-ai/infinitetalk-fast-video-to-video-multi.

How much does Infinitetalk Fast Video To Video Multi cost per run?

Infinitetalk Fast Video To Video Multi starts at $0.075 per run. That figure is the base price — the final charge scales with the parameters you set in the form (output size, length, count, references, or whatever knobs this model exposes), so a higher-quality or larger output costs more than a minimal one. The exact cost for your current input is shown live next to the Generate button before you submit, and the actual per-call charge is recorded on the prediction afterwards.

What inputs does Infinitetalk Fast Video To Video Multi accept?

Key inputs: `prompt`, `video`, `seed`, `left_audio`, `order`, `right_audio`. The full JSON schema (types, defaults, allowed values) is rendered above the Generate button and mirrored in the API reference at https://wavespeed.ai/docs/docs-api/wavespeed-ai/infinitetalk-fast-video-to-video-multi.

How do I get started with the Infinitetalk Fast Video To Video Multi API?

Sign up for a free WaveSpeedAI account to claim starter credits, copy your API key from /accesskey, then call the endpoint shown in the API tab of the playground. The playground also auto-generates a code sample in Python, JavaScript, or cURL for the parameters you've set.

Can I use Infinitetalk Fast Video To Video Multi outputs commercially?

Commercial usage rights depend on the model's license, set by its provider (WaveSpeedAI). The license summary appears on the model card above; see WaveSpeedAI's Terms of Service for platform-level conditions.

ExamplesView all

Related Models

README

InfiniteTalk Fast Video-to-Video Multi

Why Choose This?

Parameters

How to Use

Pricing

Billing Rules

Best Use Cases

Pro Tips

Notes

Related Models

Reference

Infinitetalk Fast Video To Video Multi API — Quick start

Infinitetalk Fast Video To Video Multi API — Frequently asked questions