Manipulate video playback speeds

Using our ffmpeg parameter, we can alter both audio and video stream playback speeds. This allows us to achieve either a fast-forwarded or slow-motion effect within our Template, the latter being what we are focusing on in this demo.

To change our input files video stream, you need to use the setpts (presentation timestamp) flag and for the audio stream the atempo flag. With this demo's Instructions, the custom ffmpeg parameter values encode a slow-motion effect to our result video playing back both audio and video at 50% playback speed.

Since we do not want to tamper with the video in any other way, make sure to set your preset parameter value to empty .

Step 1:

Handle uploads

We can handle uploads of your users directly.Learn more

kite50.mp4

Video – 7.6 MB

49s · 1024 × 768

":original": {
  "robot": "/upload/handle"
}

/upload/handle

This bot receives uploads that your users throw at you from browser or apps, or that you throw at us programmatically

Step 2:

Transcode, resize, or watermark videos

We offer a variety of video encoding features like optimizing for different devices, merging, injecting ads, changing audio tracks, or adding company logos.Learn more

kite50.mp4

Video – 10 MB

98s · 1024 × 768

"slow_motion": {
  "use": ":original",
  "robot": "/video/encode",
  "result": true,
  "ffmpeg": {
    "filter_complex": "[0:v]setpts=2.0*PTS[v];[0:a]atempo=0.5[a]",
    "map": [
      "[v]",
      "[a]"
    ]
  },
  "ffmpeg_stack": "v7",
  "preset": "empty",
  "rotate": false
}

/video/encode

This bot encodes, resizes, applies watermarks to videos and animated GIFs

Step 3:

Export files to Amazon S3

We export to the storage platform of your choice.Learn more

:original

https://demos.transloadit.com/11/6da3a96119453893e925b902c6e2e1/kite50.mp4

slow_motion

https://demos.transloadit.com/57/087a8595354e4796c6ee72bbc0c31e/kite50.mp4

"exported": {
  "use": [
    "slow_motion",
    ":original"
  ],
  "robot": "/s3/store",
  "credentials": "demo_s3_credentials",
  "url_prefix": "https://demos.transloadit.com/"
}

/s3/store

This bot exports encoding results to Amazon S3

Live Demo. See for yourself

Loading Uppy demo…

This live demo is powered by Uppy, our open source file uploader that you can also use without Transloadit, and tus, our open protocol for resumable file uploads that is making uploading more reliable across the world.

Build this in your own language

<!-- This pulls Uppy from our CDN -->
<!-- For smaller self-hosted bundles, install Uppy and plugins manually: -->
<!-- npm i --save @uppy/core @uppy/dashboard @uppy/remote-sources @uppy/transloadit ... -->
<link
  href="https://releases.transloadit.com/uppy/v3.10.0/uppy.min.css"
  rel="stylesheet"
/>
<button id="browse">Select Files</button>
<script type="module">
  import {
    Uppy,
    Dashboard,
    ImageEditor,
    RemoteSources,
    Transloadit,
  } from 'https://releases.transloadit.com/uppy/v3.10.0/uppy.min.mjs'
  const uppy = new Uppy()
    .use(Transloadit, {
      waitForEncoding: true,
      alwaysRunAssembly: true,
      assemblyOptions: {
        params: {
          // It's often better store encoding instructions in your account
          // and use a `template_id` instead of adding these steps inline
          steps: {
            ':original': {
              robot: '/upload/handle',
            },
            slow_motion: {
              use: ':original',
              robot: '/video/encode',
              result: true,
              ffmpeg: {
                filter_complex: '[0:v]setpts=2.0*PTS[v];[0:a]atempo=0.5[a]',
                map: ['[v]', '[a]'],
              },
              ffmpeg_stack: 'v7',
              preset: 'empty',
              rotate: false,
            },
            exported: {
              use: ['slow_motion', ':original'],
              robot: '/s3/store',
              credentials: 'demo_s3_credentials',
              url_prefix: 'https://demos.transloadit.com/',
            },
          },
        },
      },
    })
    .use(Dashboard, { trigger: '#browse' })
    .use(ImageEditor, { target: Dashboard })
    .use(RemoteSources, {
      companionUrl: 'https://api2.transloadit.com/companion',
    })
    .on('complete', ({ transloadit }) => {
      // Due to `waitForEncoding:true` this is fired after encoding is done.
      // Alternatively, set `waitForEncoding` to `false` and provide a `notify_url`
      console.log(transloadit) // Array of Assembly Statuses
      for (const assembly of transloadit) {
        console.log(assembly.results) // Array of all encoding results
      }
    })
    .on('error', (error) => {
      console.error(error)
    })
</script>

Read docs: Browsers

So many ways to integrate

Transloadit is a service for companies with developers. And there are many ways developers can put Transloadit to good use inside your company to automate media processing.