Transcode with Storj

This guide will describe how to use the Livepeer transcode API to transcode and store video files in Storj using Storj’s S3 API.

There are code examples provided for reference.

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Storj S3 Credentials

This step assumes that you have already created an account with Storj.

Follow the Storj guide for generating S3 credentials using either the web interface or uplink. Make sure that the credentials have the proper read/write permissions for the bucket that your video files will be read from and that transcoded videos will be written to. The access key and secret key of the credentials will be used in the next step.

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Upload Video to Storj

Make sure you have a video file uploaded to your Storj bucket. You must upload the video file using one of the following methods:

• Via the Storj web interface
• Via the Storj uplink CLI
• Via a S3 API client
  • AWS has S3 API client implementations in different programming languages
  • The code examples illustrate how to upload a video file to Storj using a S3 API client

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Transcode with Livepeer

This step assumes that you have already created a Livepeer Studio account and an API key.

• Node.js
• Python
• Go

import { Livepeer } from "livepeer";

const apiKey = "YOUR_API_KEY";

const livepeer = new Livepeer({ apiKey });

livepeer.transcode.create({
  input: {
    type: "s3",
    endpoint: "https://gateway.storjshare.io",
    credentials: {
      accessKeyId: "$ACCESS_KEY_ID",
      secretAccessKey: "$SECRET_ACCESS_KEY"
    },
    bucket: "mybucket",
    path: "/video/source.mp4"
  },
  storage: {
    type: "s3",
    endpoint: "https://gateway.storjshare.io",
    credentials: {
      accessKeyId: "$ACCESS_KEY_ID",
      secretAccessKey: "$SECRET_ACCESS_KEY"
    },
    bucket: "mybucket"
  },
  outputs: {
    hls: {
      path: "/samplevideo/hls"
    },
    mp4: {
      path: "/samplevideo/mp4"
    }
  },
  profiles: [
    {
      name: "480p",
      bitrate: 1000000,
      fps: 30,
      width: 854,
      height: 480
    },
    {
      name: "360p",
      bitrate: 500000,
      fps: 30,
      width: 640,
      height: 360
    }
  ]
}).then((video) => {
  console.log(video);
}).catch((error) => {
  console.error(error);
});

The parameters are defined as:

• $API_KEY is your Livepeer Studio API key
• $ACCESS_KEY_ID is the access key and $SECRET_ACCESS_KEY is the secret key of the S3 credentials you generated in the previous step
• input.bucket is the name of your Storj bucket
• input.path is the path that your video file can be found in the Storj bucket
• outputs.hls.path is the path that the HLS playlist and mpegts segments is found in when transcoding is complete
• outputs.mp4.path is the path that the MP4 video files is found in when transcoding is complete
• profiles is an optional parameter to specify the desired properties of transcoded video

Use the task ID in the response to query for the transcoding task status. Once the task is complete, the HLS playlist and mpegts segments will be available at outputs.hls.path, and MP4 output videos will be available at outputs.mp4.path.

For more information about the transcode API refer to the API reference docs.

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Playback From Storj

You can create a public playback URL for the transcoded video by first creating a shared Storj URL:

• If you are using uplink, follow the Storj Link Sharing guide to create a URL for your bucket
• Ex. uplink share sj://demo-bucket/ --url --not-after=none --base-url=https://link.storjshare.io
• If you are using the web interface, navigate to your bucket under “Buckets” and click the “Share Bucket” button to create a URL for your bucket

The URL should look like this:

https://link.storjshare.io/jwjfgdxkvmfgngsgitii6pny62za/demo-bucket

For example, if the outputs.hls.path for the request in the previous step was /samplevideo/hls, then the master HLS playlist used for playback will be available at:

https://link.storjshare.io/jwjfgdxkvmfgngsgitii6pny62za/demo-bucket

You can play back the transcoded video from Storj using this URL with any HLS player. For example, https://lvpr.tv/?url=https://storage.lp-playback.studio/raw/jwjfgdx…/demo-bucket/samplevideo/hls/index.m3u8 will play back the video using the embeddable Livepeer player.

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Code Examples

• Nodejs