Sound

Echo effect for audio

A repeat behind the sound.

Shown on A narration from LibriVox

Before · the same request without it

After · A quick repeat behind the voice.

Transcript

High above the city, on a tall column, stood the statue of the Happy Prince. He was gilded all over with thin leaves of fine gold.

The entry

Add it to a clip's effects list. Entries run in the order you write them.

{
  "type": "echo"
}

Settings

Name	Accepts	Default	What it does
delay	0.1 to 10 s	0.28	Time before the repeat, in seconds. The engine starts at 0.1.
amount	0 to 1	0.4	0 to 1, how loud the repeat is against the original.

Run it

The whole request behind the render above. Paste it as it is, or swap the file for your own.

TypeScript SDK cURL

import { createClient, outputUrl } from "@rendobar/sdk";

const rb = createClient({ apiKey: process.env.RENDOBAR_API_KEY });

const job = await rb.jobs.run({
  type: "compose",
  params: {
    schemaVersion: 1,
    output: {
      format: "mp3"
    },
    timeline: {
      tracks: [
        {
          clips: [
            {
              asset: {
                type: "audio",
                src: "https://cdn.rendobar.com/compose/showcase/media/narration.wav"
              },
              start: 0,
              effects: [
                {
                  type: "echo"
                }
              ]
            }
          ]
        }
      ]
    }
  },
});

console.log(outputUrl(job));

Install with npm i @rendobar/sdk. jobs.run() submits and waits, so it returns the finished job in one call.

curl https://api.rendobar.com/jobs \
  -H "Authorization: Bearer $RENDOBAR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"type":"compose","params":{"schemaVersion":1,"output":{"format":"mp3"},"timeline":{"tracks":[{"clips":[{"asset":{"type":"audio","src":"https://cdn.rendobar.com/compose/showcase/media/narration.wav"},"start":0,"effects":[{"type":"echo"}]}]}]}}}'

Returns immediately with a job id. Poll GET /jobs/{id} or register a webhook rather than blocking on the request.

Questions

What does the echo effect do in compose?

A repeat behind the sound. A quick repeat behind the voice.

How do I add echo to a video with an API?

Send a compose job to the Rendobar API with this entry in the timeline: {"type":"echo"}. Add it to a clip's effects list. Entries run in the order you write them. The request on this page is complete and renders as shown.

What are the default settings for echo?

Every setting has a default, so the type on its own is enough: delay 0.28 and amount 0.4. Set only the ones you want to change.

Footage and sound

The Happy Prince, by Oscar Wilde, read for LibriVox, by LibriVox volunteer reader. Public domain.

EQ More low end and more sparkle on a music bed. Compressor Even out a voice so quiet words and loud words sit at one level. Limiter Make music louder without letting the peaks clip. Noise gate Close the microphone when nobody is speaking, so the river drops away before and after the voice. High pass Cut the rumble under a voice. Wind, traffic and water live there. Low pass Music from the next room.

See all 77 in the effects reference →