Picture effects

Light trails effect for video

Blend the last moments of the clip together, so moving lights and people leave streaks.

Shown on City traffic at night from above

Before · the same request without it
After · Traffic leaves streaks behind it. The camera has to be locked off, or everything smears.

The entry

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

{
  "type": "trails",
  "duration": 2.2
}

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/interchange.mp4"
              },
              start: 0,
              effects: [
                {
                  type: "trails",
                  duration: 2.2
                }
              ]
            }
          ]
        }
      ]
    }
  },
});


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/interchange.mp4"},"start":0,"effects":[{"type":"trails","duration":2.2}]}]}]}}}'

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

Questions

What does the trails effect do in compose?

Blend the last moments of the clip together, so moving lights and people leave streaks. Traffic leaves streaks behind it. The camera has to be locked off, or everything smears.

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

Send a compose job to the Rendobar API with this entry in the timeline: {"type":"trails","duration":2.2}. 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 trails?

Every setting has a default, so the type on its own is enough: duration 0.9. Set only the ones you want to change.

Footage and sound

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