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Transloadit is a service for companies with developers. We handle their file uploads and media processing. This means that they can save on development time and the heavy machinery that is required to handle big volumes in an automated way.

We pioneered with this concept in 2009 and have made our customers happy ever since. We are still actively improving our service in 2024, as well as our open source projects uppy.io and tus.io, which are changing how the world does file uploading.

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  1. Services
  2. Video Encoding
  3. Demos

Encode a fade effect between concatenated video files.

🤖/video/concat enables you to concatenate together all your video files quickly and easily whilst encoding a fade effect between each clip.

If you were looking for a way to add some extra flair to your concatenated videos you are in luck. With this demo, we are going to show how adding both the video_fade_seconds and audio_fade_seconds parameters can make all the difference. As well, we are going to look into how we can overcome the parameters shortcoming of not adding a fade effect at the beginning of your videos using the ffmpeg parameter.

To make sure we have everything all set up as needed for our concatenation to take place, we first need to resize both of our video clips. We do this by passing both our imported videos to 🤖/video/encode making sure we set the same dimensions and preset value.

Now we have both our files prepared we can pass them to 🤖/video/concat. Within our use parameter we set up both the name value of our previously resized step, along with an as value. When concatenating videos the order they are set in is specified by how we set up by our as value, so for example as: "video_1" would come before as: "video_2".

To add our fancy fade effect we set up both the video_fade_seconds and audio_fade_seconds parameters with values to specify how long we want these transitions to last between each video file. These parameters allow you to seamlessly create both an audio and video fade effect between your video files. This even allows for millisecond values to be represented by using decimal values. So if you wanted the fade effect to last 750 milliseconds, you would select 0.75.

With our fade effects in place, why don't we add a video fade at the beginning of our video? Because 🤖/video/concat works by using FFMpeg, if we try add any additional vf parameter values, this will result in a error. So to bypass this, we need to pass our concatenate step to 🤖/video/encode. We have already encoded our videos preset value in our previous step, so no need to do that again. Simply add a preset parameter, and set its value to empty so the Robot can run as intended.

Using our ffmpeg parameter, we set up a vf parameter and set its value to fade=type=in:duration=1. This creates a video fade-in effect at the start of our final file.

Now with everything set up, we are good to run and see the final result. Happy Encoding!

⚠️ It seems your browser does not send the referer, which we need to stop people from (ab)using our demos in other websites. If you want to use the demos, please allow your browser to send its referer to us. Adding us to the allowlist of blockers usually helps.

Step 1: Handle uploads

We can handle uploads of your users directly. Learn more ›

⚠️ It seems your browser does not support the codec used in this video of the page. For demo simplicity we'll link you to the original file, but you may also want to learn how to make videos compatible for all browsers.
kite10.mp4
MPEG-4 video – 2.0 MB
13s · 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: Import files from web servers

We are happy to import from whatever storage solution suits you best. Learn more ›

⚠️ It seems your browser does not support the codec used in this video of the page. For demo simplicity we'll link you to the original file, but you may also want to learn how to make videos compatible for all browsers.
waves10-0.mp4
MPEG-4 video – 1.9 MB
13s · 1024 × 768 
"preroll_imported": {
  "robot": "/http/import",
  "result": true,
  "url": "https://demos.transloadit.com/inputs/waves10.mp4"
}
🤖/http/import
This bot imports any file that is publicly available via a web URL into Transloadit

Step 3: Resize videos to 480×270 and encode for iPad (high quality) (H.264)

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 ›

⚠️ It seems your browser does not support the codec used in this video of the page. For demo simplicity we'll link you to the original file, but you may also want to learn how to make videos compatible for all browsers.
waves10-0.mp4
MPEG-4 video – 1.9 MB
13s · 480 × 270 
"preroll_resized": {
  "robot": "/video/encode",
  "use": "preroll_imported",
  "result": true,
  "ffmpeg_stack": "v6.0.0",
  "preset": "ipad-high",
  "width": 480,
  "height": 270,
  "resize_strategy": "pad",
  "background": "#000000",
  "turbo": false
}
🤖/video/encode
This bot encodes, resizes, applies watermarks to videos and animated GIFs

Step 4: Resize videos to 480×270 and encode for iPad (high quality) (H.264)

⚠️ It seems your browser does not support the codec used in this video of the page. For demo simplicity we'll link you to the original file, but you may also want to learn how to make videos compatible for all browsers.
kite10-0.mp4
MPEG-4 video – 2.0 MB
13s · 480 × 270 
"original_resized": {
  "robot": "/video/encode",
  "use": ":original",
  "result": true,
  "ffmpeg_stack": "v6.0.0",
  "preset": "ipad-high",
  "width": 480,
  "height": 270,
  "resize_strategy": "pad",
  "background": "#000000",
  "turbo": false
}
🤖/video/encode
This bot encodes, resizes, applies watermarks to videos and animated GIFs

Step 5: Concatenate 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 ›

⚠️ It seems your browser does not support the codec used in this video of the page. For demo simplicity we'll link you to the original file, but you may also want to learn how to make videos compatible for all browsers.
kite10_waves10-0.mp4
MPEG-4 video – 4.0 MB
26s · 480 × 270 
"concatenated": {
  "use": {
    "steps": [
      {
        "name": "original_resized",
        "as": "video_1"
      },
      {
        "name": "preroll_resized",
        "as": "video_2"
      }
    ]
  },
  "robot": "/video/concat",
  "result": true,
  "ffmpeg_stack": "v6.0.0",
  "preset": "ipad-high",
  "video_fade_seconds": 1,
  "audio_fade_seconds": 1
}
🤖/video/concat
This bot concatenates several videos together

Step 6: Transcode videos to original codec Settings

⚠️ It seems your browser does not support the codec used in this video of the page. For demo simplicity we'll link you to the original file, but you may also want to learn how to make videos compatible for all browsers.
kite10_waves10-0.mp4
MPEG-4 video – 1.1 MB
26s · 480 × 270 
"encode": {
  "use": "concatenated",
  "robot": "/video/encode",
  "preset": "empty",
  "ffmpeg": {
    "vf": "fade=type=in:duration=1"
  },
  "ffmpeg_stack": "v6.0.0",
  "turbo": false
}
🤖/video/encode
This bot encodes, resizes, applies watermarks to videos and animated GIFs

Step 7: Export files to Amazon S3

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

:original
preroll_imported
preroll_resized
original_resized
concatenated
encode

Once all files have been exported, we can ping a URL of your choice with the Assembly status JSON. 

"exported": {
  "use": [
    "preroll_imported",
    "preroll_resized",
    "original_resized",
    "concatenated",
    "encode",
    ":original"
  ],
  "robot": "/s3/store",
  "credentials": "YOUR_AWS_CREDENTIALS",
  "url_prefix": "https://demos.transloadit.com/"
}
🤖/s3/store
This bot exports encoding results to Amazon S3
Since this is a store Robot, be sure to use Template Credentials so that any sensitive data is encrypted and stored in our database, making sure that they’re never exposed to any end-user.

Live Demo. See for yourself

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

Build this in your own language

{
  "steps": {
    ":original": {
      "robot": "/upload/handle"
    },
    "preroll_imported": {
      "robot": "/http/import",
      "result": true,
      "url": "https://demos.transloadit.com/inputs/waves10.mp4"
    },
    "preroll_resized": {
      "robot": "/video/encode",
      "use": "preroll_imported",
      "result": true,
      "ffmpeg_stack": "v6.0.0",
      "preset": "ipad-high",
      "width": 480,
      "height": 270,
      "resize_strategy": "pad",
      "background": "#000000",
      "turbo": false
    },
    "original_resized": {
      "robot": "/video/encode",
      "use": ":original",
      "result": true,
      "ffmpeg_stack": "v6.0.0",
      "preset": "ipad-high",
      "width": 480,
      "height": 270,
      "resize_strategy": "pad",
      "background": "#000000",
      "turbo": false
    },
    "concatenated": {
      "use": {
        "steps": [
          {
            "name": "original_resized",
            "as": "video_1"
          }, 
,          {
            "name": "preroll_resized",
            "as": "video_2"
          }
        ]
      },
      "robot": "/video/concat",
      "result": true,
      "ffmpeg_stack": "v6.0.0",
      "preset": "ipad-high",
      "video_fade_seconds": 1,
      "audio_fade_seconds": 1
    },
    "encode": {
      "use": "concatenated",
      "robot": "/video/encode",
      "preset": "empty",
      "ffmpeg": {
        "vf": "fade=type=in:duration=1"
      },
      "ffmpeg_stack": "v6.0.0",
      "turbo": false
    },
    "exported": {
      "use": ["preroll_imported", "preroll_resized", "original_resized", "concatenated", "encode", ":original"],
      "robot": "/s3/store",
      "credentials": "YOUR_AWS_CREDENTIALS",
      "url_prefix": "https://demos.transloadit.com/"
    }
  }
}

# Prerequisites: brew install curl jq || sudo apt install curl jq
# To avoid tampering, use Signature Authentication
echo '{
  "template_id": undefined,
  "auth": {
    "key": "YOUR_TRANSLOADIT_KEY"
  },
  "steps": {
    ":original": {
      "robot": "/upload/handle"
    },
    "preroll_imported": {
      "robot": "/http/import",
      "result": true,
      "url": "https://demos.transloadit.com/inputs/waves10.mp4"
    },
    "preroll_resized": {
      "robot": "/video/encode",
      "use": "preroll_imported",
      "result": true,
      "ffmpeg_stack": "v6.0.0",
      "preset": "ipad-high",
      "width": 480,
      "height": 270,
      "resize_strategy": "pad",
      "background": "#000000",
      "turbo": false
    },
    "original_resized": {
      "robot": "/video/encode",
      "use": ":original",
      "result": true,
      "ffmpeg_stack": "v6.0.0",
      "preset": "ipad-high",
      "width": 480,
      "height": 270,
      "resize_strategy": "pad",
      "background": "#000000",
      "turbo": false
    },
    "concatenated": {
      "use": {
        "steps": [
          {
            "name": "original_resized",
            "as": "video_1"
          }, 
,          {
            "name": "preroll_resized",
            "as": "video_2"
          }
        ]
      },
      "robot": "/video/concat",
      "result": true,
      "ffmpeg_stack": "v6.0.0",
      "preset": "ipad-high",
      "video_fade_seconds": 1,
      "audio_fade_seconds": 1
    },
    "encode": {
      "use": "concatenated",
      "robot": "/video/encode",
      "preset": "empty",
      "ffmpeg": {
        "vf": "fade=type=in:duration=1"
      },
      "ffmpeg_stack": "v6.0.0",
      "turbo": false
    },
    "exported": {
      "use": ["preroll_imported", "preroll_resized", "original_resized", "concatenated", "encode", ":original"],
      "robot": "/s3/store",
      "credentials": "YOUR_AWS_CREDENTIALS",
      "url_prefix": "https://demos.transloadit.com/"
    }
  }
}' | curl \\
    --request POST \\
    --form 'params=<-' \\
    --form myfile1=@./kite10.mp4 \\
    https://api2.transloadit.com/assemblies | jq

// Install via Swift Package Manager:
// dependencies: [
//   .package(url: "https://github.com/transloadit/TransloaditKit", .upToNextMajor(from: "3.0.0"))
// ]

// Or via CocoaPods:
// pod 'Transloadit', '~> 3.0.0'

// Auth
let credentials = Credentials(key: "YOUR_TRANSLOADIT_KEY")

// Init
let transloadit = Transloadit(credentials: credentials, session: "URLSession.shared")

// Add files to upload
let filesToUpload: [URL] = ...

// Execute
let assembly = transloadit.assembly(steps: [
  _originalStep, 
,  preroll_importedStep, 
,  preroll_resizedStep, 
,  original_resizedStep, 
,  concatenatedStep, 
,  encodeStep, 
,  exportedStep, 
], andUpload: filesToUpload) { result in
  switch result {
  case .success(let assembly):
    print("Retrieved (assembly)")
  case .failure(let error):
    print("Assembly error (error)")
  }
}.pollAssemblyStatus { result in
  switch result {
  case .success(let assemblyStatus):
    print("Received assemblystatus (assemblyStatus)")
  case .failure(let error):
    print("Caught polling error (error)")
  }

<!-- 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/v4.3.0/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/v4.3.0/uppy.min.mjs'
  const uppy = new Uppy()
    .use(Transloadit, {
      waitForEncoding: true,
      alwaysRunAssembly: true,
      assemblyOptions: {
        params: {
          // To avoid tampering, use Signature Authentication:
          // https://transloadit.com/docs/topics/signature-authentication/
          auth: {
            key: 'YOUR_TRANSLOADIT_KEY',
          },
          // 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',
            },
            preroll_imported: {
              robot: '/http/import',
              result: true,
              url: 'https://demos.transloadit.com/inputs/waves10.mp4',
            },
            preroll_resized: {
              robot: '/video/encode',
              use: 'preroll_imported',
              result: true,
              ffmpeg_stack: 'v6.0.0',
              preset: 'ipad-high',
              width: 480,
              height: 270,
              resize_strategy: 'pad',
              background: '#000000',
              turbo: false,
            },
            original_resized: {
              robot: '/video/encode',
              use: ':original',
              result: true,
              ffmpeg_stack: 'v6.0.0',
              preset: 'ipad-high',
              width: 480,
              height: 270,
              resize_strategy: 'pad',
              background: '#000000',
              turbo: false,
            },
            concatenated: {
              use: {
                steps: [
                  {
                    name: 'original_resized',
                    as: 'video_1',
                  }, 
,                  {
                    name: 'preroll_resized',
                    as: 'video_2',
                  }, 
                ],
              },
              robot: '/video/concat',
              result: true,
              ffmpeg_stack: 'v6.0.0',
              preset: 'ipad-high',
              video_fade_seconds: 1,
              audio_fade_seconds: 1,
            },
            encode: {
              use: 'concatenated',
              robot: '/video/encode',
              preset: 'empty',
              ffmpeg: {
                vf: 'fade=type=in:duration=1',
              },
              ffmpeg_stack: 'v6.0.0',
              turbo: false,
            },
            exported: {
              use: ['preroll_imported', 'preroll_resized', 'original_resized', 'concatenated', 'encode', ':original'],
              robot: '/s3/store',
              credentials: 'YOUR_AWS_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
      transloadit.forEach((assembly) => {
        console.log(assembly.results) // Array of all encoding results
      })
    })
    .on('error', (error) => {
      console.error(error)
    })
</script>

// yarn add transloadit || npm i transloadit

// Import
const Transloadit = require('transloadit')

const main = async () => {
  // Init
  const transloadit = new Transloadit({
    authKey: 'YOUR_TRANSLOADIT_KEY',
    authSecret: 'MY_TRANSLOADIT_SECRET',
  })

  // Set Encoding Instructions
  const options = {
    files: {
      myfile_1: './kite10.mp4',
    },
    params: {
      steps: {
        ':original': {
          robot: '/upload/handle',
        },
        preroll_imported: {
          robot: '/http/import',
          result: true,
          url: 'https://demos.transloadit.com/inputs/waves10.mp4',
        },
        preroll_resized: {
          robot: '/video/encode',
          use: 'preroll_imported',
          result: true,
          ffmpeg_stack: 'v6.0.0',
          preset: 'ipad-high',
          width: 480,
          height: 270,
          resize_strategy: 'pad',
          background: '#000000',
          turbo: false,
        },
        original_resized: {
          robot: '/video/encode',
          use: ':original',
          result: true,
          ffmpeg_stack: 'v6.0.0',
          preset: 'ipad-high',
          width: 480,
          height: 270,
          resize_strategy: 'pad',
          background: '#000000',
          turbo: false,
        },
        concatenated: {
          use: {
            steps: [
              {
                name: 'original_resized',
                as: 'video_1',
              }, 
,              {
                name: 'preroll_resized',
                as: 'video_2',
              }, 
            ],
          },
          robot: '/video/concat',
          result: true,
          ffmpeg_stack: 'v6.0.0',
          preset: 'ipad-high',
          video_fade_seconds: 1,
          audio_fade_seconds: 1,
        },
        encode: {
          use: 'concatenated',
          robot: '/video/encode',
          preset: 'empty',
          ffmpeg: {
            vf: 'fade=type=in:duration=1',
          },
          ffmpeg_stack: 'v6.0.0',
          turbo: false,
        },
        exported: {
          use: ['preroll_imported', 'preroll_resized', 'original_resized', 'concatenated', 'encode', ':original'],
          robot: '/s3/store',
          credentials: 'YOUR_AWS_CREDENTIALS',
          url_prefix: 'https://demos.transloadit.com/',
        },
      },
    },
  }

  // Execute
  const result = await transloadit.createAssembly(options)

  // Show results
  console.log({ result })
}

main().catch(console.error)

# [sudo] npm install transloadify -g

# Auth
export TRANSLOADIT_KEY="YOUR_TRANSLOADIT_KEY"

# Save Encoding Instructions
echo '{
  "steps": {
    ":original": {
      "robot": "/upload/handle"
    },
    "preroll_imported": {
      "robot": "/http/import",
      "result": true,
      "url": "https://demos.transloadit.com/inputs/waves10.mp4"
    },
    "preroll_resized": {
      "robot": "/video/encode",
      "use": "preroll_imported",
      "result": true,
      "ffmpeg_stack": "v6.0.0",
      "preset": "ipad-high",
      "width": 480,
      "height": 270,
      "resize_strategy": "pad",
      "background": "#000000",
      "turbo": false
    },
    "original_resized": {
      "robot": "/video/encode",
      "use": ":original",
      "result": true,
      "ffmpeg_stack": "v6.0.0",
      "preset": "ipad-high",
      "width": 480,
      "height": 270,
      "resize_strategy": "pad",
      "background": "#000000",
      "turbo": false
    },
    "concatenated": {
      "use": {
        "steps": [
          {
            "name": "original_resized",
            "as": "video_1"
          }, 
,          {
            "name": "preroll_resized",
            "as": "video_2"
          }
        ]
      },
      "robot": "/video/concat",
      "result": true,
      "ffmpeg_stack": "v6.0.0",
      "preset": "ipad-high",
      "video_fade_seconds": 1,
      "audio_fade_seconds": 1
    },
    "encode": {
      "use": "concatenated",
      "robot": "/video/encode",
      "preset": "empty",
      "ffmpeg": {
        "vf": "fade=type=in:duration=1"
      },
      "ffmpeg_stack": "v6.0.0",
      "turbo": false
    },
    "exported": {
      "use": ["preroll_imported", "preroll_resized", "original_resized", "concatenated", "encode", ":original"],
      "robot": "/s3/store",
      "credentials": "YOUR_AWS_CREDENTIALS",
      "url_prefix": "https://demos.transloadit.com/"
    }
  }
}' > ./steps.json

# Execute
transloadify \
  --input "kite10.mp4" \
  --steps "./steps.json" \
  --output "./output.example"

// composer require transloadit/php-sdk
use transloadit\Transloadit;

$transloadit = new Transloadit([
  "key" => "YOUR_TRANSLOADIT_KEY",
  "secret" => "MY_TRANSLOADIT_SECRET",
]);

// Start the Assembly
$response = $transloadit->createAssembly([
  "files" => ["kite10.mp4"],
  "params" => [
    "steps" => [
      ":original" => [
        "robot" => "/upload/handle",
      ],
      "preroll_imported" => [
        "robot" => "/http/import",
        "result" => true,
        "url" => "https://demos.transloadit.com/inputs/waves10.mp4",
      ],
      "preroll_resized" => [
        "robot" => "/video/encode",
        "use" => "preroll_imported",
        "result" => true,
        "ffmpeg_stack" => "v6.0.0",
        "preset" => "ipad-high",
        "width" => 480,
        "height" => 270,
        "resize_strategy" => "pad",
        "background" => "#000000",
        "turbo" => false,
      ],
      "original_resized" => [
        "robot" => "/video/encode",
        "use" => ":original",
        "result" => true,
        "ffmpeg_stack" => "v6.0.0",
        "preset" => "ipad-high",
        "width" => 480,
        "height" => 270,
        "resize_strategy" => "pad",
        "background" => "#000000",
        "turbo" => false,
      ],
      "concatenated" => [
        "use" => [
          "steps" => [
            [
              "name" => "original_resized",
              "as" => "video_1",
            ], 
,            [
              "name" => "preroll_resized",
              "as" => "video_2",
            ], 
          ],
        ],
        "robot" => "/video/concat",
        "result" => true,
        "ffmpeg_stack" => "v6.0.0",
        "preset" => "ipad-high",
        "video_fade_seconds" => 1,
        "audio_fade_seconds" => 1,
      ],
      "encode" => [
        "use" => "concatenated",
        "robot" => "/video/encode",
        "preset" => "empty",
        "ffmpeg" => [
          "vf" => "fade=type=in:duration=1",
        ],
        "ffmpeg_stack" => "v6.0.0",
        "turbo" => false,
      ],
      "exported" => [
        "use" => ["preroll_imported", "preroll_resized", "original_resized", "concatenated", "encode", ":original"],
        "robot" => "/s3/store",
        "credentials" => "YOUR_AWS_CREDENTIALS",
        "url_prefix" => "https://demos.transloadit.com/",
      ],
    ],
  ],
]);

# gem install transloadit

# $ irb -rubygems
# >> require 'transloadit'
# => true

transloadit = Transloadit.new([
  :key => "YOUR_TRANSLOADIT_KEY",
])

# Set Encoding Instructions
_original = transloadit.step(":original", "/upload/handle", {})

preroll_imported = transloadit.step("preroll_imported", "/http/import", [
  :result => true,
  :url => "https://demos.transloadit.com/inputs/waves10.mp4"
])

preroll_resized = transloadit.step("preroll_resized", "/video/encode", [
  :use => "preroll_imported",
  :result => true,
  :ffmpeg_stack => "v6.0.0",
  :preset => "ipad-high",
  :width => 480,
  :height => 270,
  :resize_strategy => "pad",
  :background => "#000000",
  :turbo => false
])

original_resized = transloadit.step("original_resized", "/video/encode", [
  :use => ":original",
  :result => true,
  :ffmpeg_stack => "v6.0.0",
  :preset => "ipad-high",
  :width => 480,
  :height => 270,
  :resize_strategy => "pad",
  :background => "#000000",
  :turbo => false
])

concatenated = transloadit.step("concatenated", "/video/concat", [
  :use => [
    :steps => [
      [
        :name => "original_resized",
        :as => "video_1"
      ], 
,      [
        :name => "preroll_resized",
        :as => "video_2"
      ]
    ]
  ],
  :result => true,
  :ffmpeg_stack => "v6.0.0",
  :preset => "ipad-high",
  :video_fade_seconds => 1,
  :audio_fade_seconds => 1
])

encode = transloadit.step("encode", "/video/encode", [
  :use => "concatenated",
  :preset => "empty",
  :ffmpeg => [
    :vf => "fade=type=in:duration=1"
  ],
  :ffmpeg_stack => "v6.0.0",
  :turbo => false
])

exported = transloadit.step("exported", "/s3/store", [
  :use => ["preroll_imported", "preroll_resized", "original_resized", "concatenated", "encode", ":original"],
  :credentials => "YOUR_AWS_CREDENTIALS",
  :url_prefix => "https://demos.transloadit.com/"
])

transloadit.assembly([
  :steps => [_original, preroll_imported, preroll_resized, original_resized, concatenated, encode, exported]
])

# Add files to upload
files = []
files.push("kite10.mp4")

# Start the Assembly
response = assembly.create! *files

until response.finished?
  sleep 1; response.reload!
end

if !response.error?
  # handle success
end

# pip install pytransloadit
from transloadit import client

tl = client.Transloadit('YOUR_TRANSLOADIT_KEY', 'MY_TRANSLOADIT_SECRET')
assembly = tl.new_assembly()

# Set Encoding Instructions
assembly.add_step(":original", "/upload/handle", {})

assembly.add_step("preroll_imported", "/http/import", {
  'result': True,
  'url': 'https://demos.transloadit.com/inputs/waves10.mp4'
})

assembly.add_step("preroll_resized", "/video/encode", {
  'use': 'preroll_imported',
  'result': True,
  'ffmpeg_stack': 'v6.0.0',
  'preset': 'ipad-high',
  'width': 480,
  'height': 270,
  'resize_strategy': 'pad',
  'background': '#000000',
  'turbo': False
})

assembly.add_step("original_resized", "/video/encode", {
  'use': ':original',
  'result': True,
  'ffmpeg_stack': 'v6.0.0',
  'preset': 'ipad-high',
  'width': 480,
  'height': 270,
  'resize_strategy': 'pad',
  'background': '#000000',
  'turbo': False
})

assembly.add_step("concatenated", "/video/concat", {
  'use': {
    'steps': [
      {
        'name': 'original_resized',
        'as': 'video_1'
      }, 
,      {
        'name': 'preroll_resized',
        'as': 'video_2'
      }
    ]
  },
  'result': True,
  'ffmpeg_stack': 'v6.0.0',
  'preset': 'ipad-high',
  'video_fade_seconds': 1,
  'audio_fade_seconds': 1
})

assembly.add_step("encode", "/video/encode", {
  'use': 'concatenated',
  'preset': 'empty',
  'ffmpeg': {
    'vf': 'fade=type=in:duration=1'
  },
  'ffmpeg_stack': 'v6.0.0',
  'turbo': False
})

assembly.add_step("exported", "/s3/store", {
  'use': ['preroll_imported', 'preroll_resized', 'original_resized', 'concatenated', 'encode', ':original'],
  'credentials': 'YOUR_AWS_CREDENTIALS',
  'url_prefix': 'https://demos.transloadit.com/'
})

# Add files to upload
assembly.add_file(open('kite10.mp4', 'rb'))

# Start the Assembly
assembly_response = assembly.create(retries=5, wait=True)

print(assembly_response.data.get('assembly_ssl_url'))
# or:
print(assembly_response.data['assembly_ssl_url'])

// go get gopkg.in/transloadit/go-sdk.v1
package main

import (
  "context"
  "fmt"
  "github.com/transloadit/go-sdk"
)

func main() {
  // Create client
  options := transloadit.DefaultConfig
  options.AuthKey = "YOUR_TRANSLOADIT_KEY"
  options.AuthSecret = "MY_TRANSLOADIT_SECRET"
  client := transloadit.NewClient(options)
  
  // Initialize new Assembly
  assembly := transloadit.NewAssembly()
  
  // Set Encoding Instructions
  assembly.AddStep(":original", map[string]interface{}{
    "robot": "/upload/handle",
  })
  
  assembly.AddStep("preroll_imported", map[string]interface{}{
    "robot": "/http/import",
    "result": true,
    "url": "https://demos.transloadit.com/inputs/waves10.mp4",
  })
  
  assembly.AddStep("preroll_resized", map[string]interface{}{
    "robot": "/video/encode",
    "use": "preroll_imported",
    "result": true,
    "ffmpeg_stack": "v6.0.0",
    "preset": "ipad-high",
    "width": 480,
    "height": 270,
    "resize_strategy": "pad",
    "background": "#000000",
    "turbo": false,
  })
  
  assembly.AddStep("original_resized", map[string]interface{}{
    "robot": "/video/encode",
    "use": ":original",
    "result": true,
    "ffmpeg_stack": "v6.0.0",
    "preset": "ipad-high",
    "width": 480,
    "height": 270,
    "resize_strategy": "pad",
    "background": "#000000",
    "turbo": false,
  })
  
  assembly.AddStep("concatenated", map[string]interface{}{
    "use": map[string]interface{}{
      "steps": [
        map[string]interface{}{
          "name": "original_resized",
          "as": "video_1",
        }, 
  ,      map[string]interface{}{
          "name": "preroll_resized",
          "as": "video_2",
        }, 
      ],
    },
    "robot": "/video/concat",
    "result": true,
    "ffmpeg_stack": "v6.0.0",
    "preset": "ipad-high",
    "video_fade_seconds": 1,
    "audio_fade_seconds": 1,
  })
  
  assembly.AddStep("encode", map[string]interface{}{
    "use": "concatenated",
    "robot": "/video/encode",
    "preset": "empty",
    "ffmpeg": map[string]interface{}{
      "vf": "fade=type=in:duration=1",
    },
    "ffmpeg_stack": "v6.0.0",
    "turbo": false,
  })
  
  assembly.AddStep("exported", map[string]interface{}{
    "use": ["preroll_imported", "preroll_resized", "original_resized", "concatenated", "encode", ":original"],
    "robot": "/s3/store",
    "credentials": "YOUR_AWS_CREDENTIALS",
    "url_prefix": "https://demos.transloadit.com/",
  })
  
  // Add files to upload
  assembly.AddFile("kite10.mp4"))
  
  // Start the Assembly
  info, err := client.StartAssembly(context.Background(), assembly)
  if err != nil {
    panic(err)
  }
  
  // All files have now been uploaded and the Assembly has started but no
  // results are available yet since the conversion has not finished.
  // WaitForAssembly provides functionality for polling until the Assembly
  // has ended.
  info, err = client.WaitForAssembly(context.Background(), info)
  if err != nil {
    panic(err)
  }
  
  fmt.Printf("You can check some results at: ")
  fmt.Printf("  - %s\n", info.Results[":original"][0].SSLURL)
  fmt.Printf("  - %s\n", info.Results["preroll_imported"][0].SSLURL)
  fmt.Printf("  - %s\n", info.Results["preroll_resized"][0].SSLURL)
  fmt.Printf("  - %s\n", info.Results["original_resized"][0].SSLURL)
  fmt.Printf("  - %s\n", info.Results["concatenated"][0].SSLURL)
  fmt.Printf("  - %s\n", info.Results["encode"][0].SSLURL)
  fmt.Printf("  - %s\n", info.Results["exported"][0].SSLURL)
}

// implementation 'com.transloadit.sdk:transloadit:1.0.0

import com.transloadit.sdk.Assembly;
import com.transloadit.sdk.Transloadit;
import com.transloadit.sdk.exceptions.LocalOperationException;
import com.transloadit.sdk.exceptions.RequestException;
import com.transloadit.sdk.response.AssemblyResponse;
import java.io.File;
import java.util.HashMap;
import java.util.Map;

public class Main {
  public static void main(String[] args) {
    // Initialize the Transloadit client
    Transloadit transloadit = new Transloadit("YOUR_TRANSLOADIT_KEY", "MY_TRANSLOADIT_SECRET");
    
    Assembly assembly = transloadit.newAssembly();
    
    // Set Encoding Instructions
    Map<String, Object> _originalStepOptions = new HashMap();
    assembly.addStep(":original", "/upload/handle", _originalStepOptions);
    
    Map<String, Object> preroll_importedStepOptions = new HashMap();
    preroll_importedStepOptions.put("result", true);
    preroll_importedStepOptions.put("url", "https://demos.transloadit.com/inputs/waves10.mp4");
    assembly.addStep("preroll_imported", "/http/import", preroll_importedStepOptions);
    
    Map<String, Object> preroll_resizedStepOptions = new HashMap();
    preroll_resizedStepOptions.put("use", "preroll_imported");
    preroll_resizedStepOptions.put("result", true);
    preroll_resizedStepOptions.put("ffmpeg_stack", "v6.0.0");
    preroll_resizedStepOptions.put("preset", "ipad-high");
    preroll_resizedStepOptions.put("width", 480);
    preroll_resizedStepOptions.put("height", 270);
    preroll_resizedStepOptions.put("resize_strategy", "pad");
    preroll_resizedStepOptions.put("background", "#000000");
    preroll_resizedStepOptions.put("turbo", false);
    assembly.addStep("preroll_resized", "/video/encode", preroll_resizedStepOptions);
    
    Map<String, Object> original_resizedStepOptions = new HashMap();
    original_resizedStepOptions.put("use", ":original");
    original_resizedStepOptions.put("result", true);
    original_resizedStepOptions.put("ffmpeg_stack", "v6.0.0");
    original_resizedStepOptions.put("preset", "ipad-high");
    original_resizedStepOptions.put("width", 480);
    original_resizedStepOptions.put("height", 270);
    original_resizedStepOptions.put("resize_strategy", "pad");
    original_resizedStepOptions.put("background", "#000000");
    original_resizedStepOptions.put("turbo", false);
    assembly.addStep("original_resized", "/video/encode", original_resizedStepOptions);
    
    Map<String, Object> concatenatedStepOptions = new HashMap();
    concatenatedStepOptions.put("use", {
        "steps": new String[] { {
          "name": "original_resized",
          "as": "video_1",
        }, {
          "name": "preroll_resized",
          "as": "video_2",
        } },
      });
    concatenatedStepOptions.put("result", true);
    concatenatedStepOptions.put("ffmpeg_stack", "v6.0.0");
    concatenatedStepOptions.put("preset", "ipad-high");
    concatenatedStepOptions.put("video_fade_seconds", 1);
    concatenatedStepOptions.put("audio_fade_seconds", 1);
    assembly.addStep("concatenated", "/video/concat", concatenatedStepOptions);
    
    Map<String, Object> encodeStepOptions = new HashMap();
    encodeStepOptions.put("use", "concatenated");
    encodeStepOptions.put("preset", "empty");
    encodeStepOptions.put("ffmpeg", {
        "vf": "fade=type=in:duration=1",
      });
    encodeStepOptions.put("ffmpeg_stack", "v6.0.0");
    encodeStepOptions.put("turbo", false);
    assembly.addStep("encode", "/video/encode", encodeStepOptions);
    
    Map<String, Object> exportedStepOptions = new HashMap();
    exportedStepOptions.put("use", new String[] { "preroll_imported", "preroll_resized", "original_resized", "concatenated", "encode", ":original" });
    exportedStepOptions.put("credentials", "YOUR_AWS_CREDENTIALS");
    exportedStepOptions.put("url_prefix", "https://demos.transloadit.com/");
    assembly.addStep("exported", "/s3/store", exportedStepOptions);
    
    // Add files to upload
    assembly.addFile(new File("kite10.mp4"));
    
    // Start the Assembly
    try {
      AssemblyResponse response = assembly.save();
    
      // Wait for Assembly to finish executing
      while (!response.isFinished()) {
        response = transloadit.getAssemblyByUrl(response.getSslUrl());
      }
    
      System.out.println(response.getId());
      System.out.println(response.getUrl());
      System.out.println(response.json());
    } catch (RequestException | LocalOperationException e) {
      // Handle exception here
    }
  }
}

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    Configure a notify_url to let your server receive transcoding results JSON in the transloadit POST field.

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