Sound

High pass filter for audio

Cut everything below a frequency. Wind, traffic and handling noise live under the voice.

Shown on A narration recorded beside a river

Before · the same request without it
After · Cut the rumble under a voice. Wind, traffic and water live there.
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": "highPass",
  "cutoff": 220
}

Every setting and default is in the docs

Run it

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

job.ts
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-noisy.wav"
              },
              start: 0,
              effects: [
                {
                  type: "highPass",
                  cutoff: 220
                }
              ]
            }
          ]
        }
      ]
    }
  },
});


console.log(outputUrl(job));

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

terminal
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-noisy.wav"},"start":0,"effects":[{"type":"highPass","cutoff":220}]}]}]}}}'

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

Questions

What does the high pass effect do in compose?

Cut everything below a frequency. Wind, traffic and handling noise live under the voice. Cut the rumble under a voice. Wind, traffic and water live there.

How do I add high pass to a video with an API?

Send a compose job to the Rendobar API with this entry in the timeline: {"type":"highPass","cutoff":220}. 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 high pass?

Every setting has a default, so the type on its own is enough: cutoff 100. Set only the ones you want to change.

Footage and sound

More features

Visualizer The audiogram: the narration drawn as a moving line over the picture. On the timeline it draws the final mix. 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. Low pass Music from the next room.

See all 117 features →