Video Sound Effects API
popnow/foley-v1/video-to-audioDesde 1 crédito por un clip de 5 segundosDale sonido a un clip mudo: la herramienta mira la imagen y genera efectos y ambiente que acompañan la acción, guiados por una descripción opcional, de hasta 30 segundos.
Llámalo con el nombre de modelo popnow/foley-v1/video-to-audio en POST /jobs/createTask, desde 1 crédito por un clip de 5 segundos (0,01 US$). Las cuentas nuevas reciben 30 créditos gratis para que lo pruebes primero en el Playground.
- Video a audio
- Clips de 1 a 30 s
popnow/foley-v1/video-to-audioPOST https://api.popnow.ai/api/v1/jobs/createTask# 1. Create the task. Keep the Idempotency-Key if you retry after a network error.
export IDEMPOTENCY_KEY="$(uuidgen)"
curl -X POST https://api.popnow.ai/api/v1/jobs/createTask \
-H "Authorization: Bearer $POPNOW_API_KEY" \
-H "Content-Type: application/json" \
-H "Idempotency-Key: $IDEMPOTENCY_KEY" \
-d '{
"model": "popnow/foley-v1/video-to-audio",
"input": {
"video_url": "https://media.popnow.ai/effects/flower-bloom-1abd6efb.mp4",
"duration_seconds": 8
}
}'
# 2. Copy data.taskId from the response, then poll until state is succeeded, failed, canceled or expired.
TASK_ID="TASK_ID_FROM_RESPONSE"
curl "https://api.popnow.ai/api/v1/jobs/recordInfo?taskId=$TASK_ID" \
-H "Authorization: Bearer $POPNOW_API_KEY"// Node 18+ (or any runtime with fetch). Keep the API key on your server.
const BASE = "https://api.popnow.ai/api/v1";
const headers = { Authorization: `Bearer ${process.env.POPNOW_API_KEY}` };
const sleep = (ms) => new Promise((r) => setTimeout(r, ms));
async function call(path, init = {}) {
const res = await fetch(BASE + path, { ...init, headers: { ...headers, ...init.headers } });
const body = await res.json();
if (body.code !== 200) throw new Error(`${body.code} ${body.msg}`);
return body.data;
}
const { taskId } = await call("/jobs/createTask", {
method: "POST",
headers: { "Content-Type": "application/json", "Idempotency-Key": crypto.randomUUID() },
body: JSON.stringify({
"model": "popnow/foley-v1/video-to-audio",
"input": {
"video_url": "https://media.popnow.ai/effects/flower-bloom-1abd6efb.mp4",
"duration_seconds": 8
}
}),
});
// Poll with backoff. A finished task may still be copying files: wait while an asset is pending.
let task;
for (let delay = 2000; ; delay = Math.min(delay * 1.5, 15000)) {
await sleep(delay);
task = await call(`/jobs/recordInfo?taskId=${taskId}`);
const copying = (task.output?.assets ?? []).some((a) => a.pending && !a.unavailable);
if (["succeeded", "failed", "canceled", "expired"].includes(task.state) && !copying) break;
}
if (task.state !== "succeeded") throw new Error(`${task.state}: ${task.errorMessage ?? "no detail"}`);
// Each asset has a signed url (no API key needed) that expires at expiresAt: save the file.
for (const asset of task.output.assets) console.log(asset.url);import os, time, uuid, requests
BASE = "https://api.popnow.ai/api/v1"
HEADERS = {"Authorization": f"Bearer {os.environ['POPNOW_API_KEY']}"}
def call(method, path, **kwargs):
body = requests.request(method, BASE + path, headers={**HEADERS, **kwargs.pop("headers", {})}, timeout=30, **kwargs).json()
if body["code"] != 200:
raise RuntimeError(f'{body["code"]} {body["msg"]}')
return body["data"]
task_id = call(
"POST",
"/jobs/createTask",
headers={"Idempotency-Key": str(uuid.uuid4())}, # reuse it if you retry
json={
"model": "popnow/foley-v1/video-to-audio",
"input": {
"video_url": "https://media.popnow.ai/effects/flower-bloom-1abd6efb.mp4",
"duration_seconds": 8
}
},
)["taskId"]
# Poll with backoff. A finished task may still be copying files: wait while an asset is pending.
delay = 2.0
while True:
time.sleep(delay)
task = call("GET", "/jobs/recordInfo", params={"taskId": task_id})
assets = (task.get("output") or {}).get("assets") or []
copying = any(a.get("pending") and not a.get("unavailable") for a in assets)
if task["state"] in ("succeeded", "failed", "canceled", "expired") and not copying:
break
delay = min(delay * 1.5, 15.0)
if task["state"] != "succeeded":
raise RuntimeError(f'{task["state"]}: {task.get("errorMessage", "no detail")}')
# Each asset has a signed url (no API key needed) that expires at expiresAt: save the file.
for asset in assets:
print(asset["url"])El input se genera a partir del esquema de abajo, así que pasa la validación tal cual. Cambia el prompt y los enlaces por los tuyos.
Precio
| Opción | Créditos por segundo | ≈ USD |
|---|---|---|
| Estándar | 0,18 | 0,0018 US$ |
1 crédito = 0,01 $ · Todas las opciones y su precio: GET /models/popnow/foley-v1/video-to-audio
Cada tarea se redondea al alza a créditos enteros, así que una ejecución en el nivel más bajo cuesta 1 crédito por un clip de 5 segundos (0,01 US$).
Límites
- Duración del clip
- 1–30 s
- Longitud del prompt (caracteres)
- 1,000
- Subida máxima
- 90 MB
Parámetros
Estos campos salen del mismo esquema con el que validamos cada petición. Los campos que no aparecen se rechazan.
video_urlstringObligatorioEl clip con el que trabajar.
promptstringOpcionalThe sounds you want, as a short list. If omitted, a general request for sounds that match the on-screen action is used.
duration_secondsintegerOpcionalCambia el precioCuánto dura el clip. Se cobra por segundo.
negative_promptstringOpcionalEstilos o sonidos que no quieres en la pista.
ignore_visual_semanticsbooleanOpcionalChoose the sounds from the prompt alone instead of from what the picture shows; timing still follows the motion.
guidance_scalenumberOpcionalCon qué rigor sigue el modelo el prompt.
stepsintegerOpcionalMás pasos dan más detalle, pero tardan más.
Esquema JSON sin procesar
{
"additionalProperties": false,
"properties": {
"duration_seconds": {
"default": 8,
"description": "Seconds of sound to generate, from 1 to 30. The returned clip is cut to this length and these seconds are billed.",
"maximum": 30,
"minimum": 1,
"type": "integer"
},
"guidance_scale": {
"default": 4.5,
"description": "How closely the sound follows the description, from 0 to 20.",
"maximum": 20,
"minimum": 0,
"type": "number"
},
"ignore_visual_semantics": {
"default": false,
"description": "Choose the sounds from the prompt alone instead of from what the picture shows; timing still follows the motion.",
"type": "boolean"
},
"negative_prompt": {
"description": "Sounds to keep out, such as music or speech.",
"maxLength": 1000,
"type": "string"
},
"prompt": {
"description": "The sounds you want, as a short list. If omitted, a general request for sounds that match the on-screen action is used.",
"maxLength": 1000,
"minLength": 1,
"type": "string"
},
"steps": {
"default": 25,
"description": "Refinement passes, from 4 to 50. More passes take longer.",
"maximum": 50,
"minimum": 4,
"type": "integer"
},
"video_url": {
"contentMediaType": [
"video/mp4",
"video/webm",
"video/quicktime"
],
"description": "Clip to add sound to. The picture is kept; the returned clip carries the generated sound as its audio.",
"minLength": 1,
"type": "string"
}
},
"required": [
"video_url"
],
"type": "object"
}Respuestas, consultas y callbacks
Todos los modelos funcionan igual: crea una tarea y luego consulta su estado o espera el callback.
Consulta el precio primero
curl -X POST https://api.popnow.ai/api/v1/jobs/quote \
-H "Authorization: Bearer $POPNOW_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "popnow/foley-v1/video-to-audio",
"input": {
"video_url": "https://media.popnow.ai/effects/flower-bloom-1abd6efb.mp4",
"duration_seconds": 8
}
}'El mismo cuerpo que createTask. Devuelve el cargo esperado y el máximo posible, sin ejecutar nada.
Aceptada
HTTP/1.1 202 Accepted
{
"code": 200,
"msg": "success",
"data": {
"taskId": "task_01k3m8x9q2z4v7n5p6r8s0t1w3",
"state": "queued"
},
"request_id": "req_example_create"
}HTTP 202 significa que la tarea se aceptó y los créditos quedan reservados, todavía sin cobrar. El cargo final nunca supera la reserva.
Consultar estado
curl "https://api.popnow.ai/api/v1/jobs/recordInfo?taskId=$TASK_ID" \
-H "Authorization: Bearer $POPNOW_API_KEY"Consulta cada pocos segundos espaciando cada vez más y para cuando state sea succeeded, failed, canceled o expired.
Tarea terminada
{
"code": 200,
"msg": "success",
"data": {
"taskId": "task_01k3m8x9q2z4v7n5p6r8s0t1w3",
"model": "popnow/foley-v1/video-to-audio",
"state": "succeeded",
"output": {
"assets": [
{
"url": "https://cdn.popnow.ai/tasks/task_01k3m8x9q2z4v7n5p6r8s0t1w3/output.mp3?signature=FROM_RESPONSE",
"expiresAt": "2026-10-17T12:20:00Z",
"mime": "audio/mpeg",
"durationSeconds": 30
}
]
},
"settled": true
},
"request_id": "req_example_record"
}Descarga desde la url antes de expiresAt. ¿Necesitas un enlace nuevo más tarde? Pídelo con POST /common/download-url.
Verificar un callback
import { createHash, createHmac, timingSafeEqual } from "node:crypto";
import express from "express";
const app = express();
// express.raw keeps the exact bytes that were signed; express.json would not match.
app.post("/hooks/popnow", express.raw({ type: "application/json" }), (req, res) => {
const timestamp = req.header("X-Webhook-Timestamp");
const signature = req.header("X-Webhook-Signature") ?? "";
const body = JSON.parse(req.body.toString("utf8"));
const taskId = body.data?.taskId ?? body.task_id;
const digest = createHash("sha256").update(req.body).digest("hex");
const expected = createHmac("sha256", process.env.POPNOW_WEBHOOK_SECRET)
.update(`${taskId}.${timestamp}.${digest}`)
.digest("base64");
const ok = expected.length === signature.length && timingSafeEqual(Buffer.from(expected), Buffer.from(signature));
// Check the signature first, then reject anything older than five minutes.
if (!ok || Math.abs(Date.now() / 1000 - Number(timestamp)) > 300) return res.status(401).end();
res.status(200).end(); // answer fast, then fetch the task and store its files
});Con callBackUrl te enviamos la tarea terminada. Comprueba la firma sobre el cuerpo sin procesar antes de fiarte de ella.
Enviar un archivo local
curl -X POST https://api.popnow.ai/api/v1/common/upload-url \
-H "Authorization: Bearer $POPNOW_API_KEY" \
-H "Content-Type: application/json" \
-d '{"contentType": "image/png", "bytes": 482113}'
# PUT the file bytes to data.uploadUrl with every header in data.headers, then commit it:
curl -X POST https://api.popnow.ai/api/v1/files/$FILE_ID/commit \
-H "Authorization: Bearer $POPNOW_API_KEY"
# The commit returns a popnow://f/... reference. Put it in any image, video or
# audio field of the task input instead of a public https URL.Los enlaces https públicos funcionan tal cual. Los archivos locales pasan antes por upload-url y commit.

