Picture effects

Chroma key green screen for video

Remove a solid background colour (green screen). Put the keyed clip on an UPPER track, and the removed area shows the track below.

Shown on A presenter on green screen, over a drone shot of a coast

Before · the same request without it
After · Remove the green screen so the presenter stands in front of a new background.

The entry

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

{
  "type": "chromaKey",
  "color": "#66DD09",
  "similarity": 0.3
}

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: "mp4",
      resolution: {
        width: 960,
        height: 540
      }
    },
    timeline: {
      tracks: [
        {
          clips: [
            {
              asset: {
                type: "video",
                src: "https://cdn.rendobar.com/compose/showcase/media/coast-a.mp4"
              },
              start: 0
            }
          ]
        },
        {
          clips: [
            {
              asset: {
                type: "video",
                src: "https://cdn.rendobar.com/compose/showcase/media/presenter.mp4"
              },
              start: 0,
              effects: [
                {
                  type: "chromaKey",
                  color: "#66DD09",
                  similarity: 0.3
                }
              ]
            }
          ]
        }
      ]
    }
  },
});


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":"mp4","resolution":{"width":960,"height":540}},"timeline":{"tracks":[{"clips":[{"asset":{"type":"video","src":"https://cdn.rendobar.com/compose/showcase/media/coast-a.mp4"},"start":0}]},{"clips":[{"asset":{"type":"video","src":"https://cdn.rendobar.com/compose/showcase/media/presenter.mp4"},"start":0,"effects":[{"type":"chromaKey","color":"#66DD09","similarity":0.3}]}]}]}}}'

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

Questions

What does the chroma key effect do in compose?

Remove a solid background colour (green screen). Put the keyed clip on an UPPER track, and the removed area shows the track below. Remove the green screen so the presenter stands in front of a new background.

How do I add chroma key to a video with an API?

Send a compose job to the Rendobar API with this entry in the timeline: {"type":"chromaKey","color":"#66DD09","similarity":0.3}. 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 chroma key?

Set color. The rest have defaults: similarity 0.2.

Footage and sound

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