Media and clips

Fade a clip with opacity

How solid the clip is, 1 to 0. Keyframes on it are how a clip fades in or out.

Shown on A motorcycle over a drone shot of a coast

Before · the same request without it
After · rendered from the request below

The entry

Put it on the clip itself, beside its asset.

{
  "opacity": 0.45
}

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,
              length: 6
            }
          ]
        },
        {
          clips: [
            {
              asset: {
                type: "video",
                src: "https://cdn.rendobar.com/compose/showcase/media/ride.mp4"
              },
              start: 0,
              transform: {
                scale: 0.62
              },
              opacity: 0.45
            }
          ]
        }
      ]
    }
  },
});


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,"length":6}]},{"clips":[{"asset":{"type":"video","src":"https://cdn.rendobar.com/compose/showcase/media/ride.mp4"},"start":0,"transform":{"scale":0.62},"opacity":0.45}]}]}}}'

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

Questions

What does the opacity effect do in compose?

How solid the clip is, 1 to 0. Keyframes on it are how a clip fades in or out.

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

Send a compose job to the Rendobar API with this entry in the timeline: {"opacity":0.45}. Put it on the clip itself, beside its asset. The request on this page is complete and renders as shown.

Footage and sound

More features

Keyframes A Ken Burns push on a still photo. The box scales from 1 to 1.15 across the clip, eased in and out, so a photograph becomes a shot. Lottie animation A Lottie lower third that sweeps in over the footage, with the words on it set as a compose text clip. Speed Play the source faster or slower. 2 is double speed, and the clip lasts half as long. Color A warm cinematic grade: the light pulled towards gold, contrast and color lifted a little, skin left believable. LUT A film grade from a LUT file: shadows toward teal, skin and highlights toward orange, the look a colourist hands over as a .cube. Looks The whole archive look in one word: sepia, grain, dust, scratches, projector flicker and a vignette together.

See all 117 features →