We are a Swiss Army knife for your files
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.
Fade in and out audio file
Using custom FFmpeg parameters Transloadit can encode your media files in a variety of ways. In this demo, we are going to show how using our API you can trim an audio file, have it fade-in at the beginning, and fade-out at the end.
When encoding media files of any kind, it is always important to have full control of your
operation so that you can get exactly what you are looking for. Luckily, we have just the tool we
need to encode our audio files to perfection. Using our ffmpeg parameter we have
numerous encoding options to our disposal. Let's break down what each
ffmpeg parameter is doing.
Using FFMpeg's af parameter, we can do some pretty neat things when encoding audio
files. When we combine it with the afade parameter we can set fade-in and fade-out
options. We use its embedded st parameter to select where the fade effect starts, and
to determine how long the fade effect lasts till volume is back to normal we use the
d parameter.
The second FFMpeg parameter we use is the to parameter. This allows us to trim our
file to the length we want by setting the duration of our file.
:bulb: combining the ss parameter with the to parameter, allows you to
specify a clip from an audio file to be extracted, as shown in this
demo. However, we
will not be needing that today as we want our fade-in effect to start right at the beginning of
our file.
Along with these parameters we also use our mp3
preset.
⚠️ 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.
Step 2:
Encode audio to MP3
We offer a variety of features to reduce audio size while maintaining quality, as well as add effects like loops or watermarks. 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.
Step 3:
Export files to Amazon S3
We export to the storage platform of your choice. Learn more ›
Once all files have been exported, we can ping a URL of your choice with the Assembly status JSON.
Build this in your own language
{
"steps": {
":original": {
"robot": "/upload/handle"
},
"encode_audio": {
"use": ":original",
"robot": "/audio/encode",
"result": true,
"ffmpeg_stack": "v6.0.0",
"preset": "mp3",
"ffmpeg": {
"af": "afade=t=in:st=0:d=4, afade=t=out:st=13:d=3",
"to": "16"
}
},
"exported": {
"use": ["encode_audio", ":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"
},
"encode_audio": {
"use": ":original",
"robot": "/audio/encode",
"result": true,
"ffmpeg_stack": "v6.0.0",
"preset": "mp3",
"ffmpeg": {
"af": "afade=t=in:st=0:d=4, afade=t=out:st=13:d=3",
"to": "16"
}
},
"exported": {
"use": ["encode_audio", ":original"],
"robot": "/s3/store",
"credentials": "YOUR_AWS_CREDENTIALS",
"url_prefix": "https://demos.transloadit.com/"
}
}
}' | curl \\
--request POST \\
--form 'params=<-' \\
--form myfile1=@./joakim_karud-rock_angel.mp3 \\
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, encode_audioStep, 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',
},
encode_audio: {
use: ':original',
robot: '/audio/encode',
result: true,
ffmpeg_stack: 'v6.0.0',
preset: 'mp3',
ffmpeg: {
af: 'afade=t=in:st=0:d=4, afade=t=out:st=13:d=3',
to: '16',
},
},
exported: {
use: ['encode_audio', ':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: './joakim_karud-rock_angel.mp3',
},
params: {
steps: {
':original': {
robot: '/upload/handle',
},
encode_audio: {
use: ':original',
robot: '/audio/encode',
result: true,
ffmpeg_stack: 'v6.0.0',
preset: 'mp3',
ffmpeg: {
af: 'afade=t=in:st=0:d=4, afade=t=out:st=13:d=3',
to: '16',
},
},
exported: {
use: ['encode_audio', ':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"
},
"encode_audio": {
"use": ":original",
"robot": "/audio/encode",
"result": true,
"ffmpeg_stack": "v6.0.0",
"preset": "mp3",
"ffmpeg": {
"af": "afade=t=in:st=0:d=4, afade=t=out:st=13:d=3",
"to": "16"
}
},
"exported": {
"use": ["encode_audio", ":original"],
"robot": "/s3/store",
"credentials": "YOUR_AWS_CREDENTIALS",
"url_prefix": "https://demos.transloadit.com/"
}
}
}' > ./steps.json
# Execute
transloadify \
--input "joakim_karud-rock_angel.mp3" \
--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" => ["joakim_karud-rock_angel.mp3"],
"params" => [
"steps" => [
":original" => [
"robot" => "/upload/handle",
],
"encode_audio" => [
"use" => ":original",
"robot" => "/audio/encode",
"result" => true,
"ffmpeg_stack" => "v6.0.0",
"preset" => "mp3",
"ffmpeg" => [
"af" => "afade=t=in:st=0:d=4, afade=t=out:st=13:d=3",
"to" => "16",
],
],
"exported" => [
"use" => ["encode_audio", ":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", {})
encode_audio = transloadit.step("encode_audio", "/audio/encode", [
:use => ":original",
:result => true,
:ffmpeg_stack => "v6.0.0",
:preset => "mp3",
:ffmpeg => [
:af => "afade=t=in:st=0:d=4, afade=t=out:st=13:d=3",
:to => "16"
]
])
exported = transloadit.step("exported", "/s3/store", [
:use => ["encode_audio", ":original"],
:credentials => "YOUR_AWS_CREDENTIALS",
:url_prefix => "https://demos.transloadit.com/"
])
transloadit.assembly([
:steps => [_original, encode_audio, exported]
])
# Add files to upload
files = []
files.push("joakim_karud-rock_angel.mp3")
# 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("encode_audio", "/audio/encode", {
'use': ':original',
'result': True,
'ffmpeg_stack': 'v6.0.0',
'preset': 'mp3',
'ffmpeg': {
'af': 'afade=t=in:st=0:d=4, afade=t=out:st=13:d=3',
'to': '16'
}
})
assembly.add_step("exported", "/s3/store", {
'use': ['encode_audio', ':original'],
'credentials': 'YOUR_AWS_CREDENTIALS',
'url_prefix': 'https://demos.transloadit.com/'
})
# Add files to upload
assembly.add_file(open('joakim_karud-rock_angel.mp3', '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("encode_audio", map[string]interface{}{
"use": ":original",
"robot": "/audio/encode",
"result": true,
"ffmpeg_stack": "v6.0.0",
"preset": "mp3",
"ffmpeg": map[string]interface{}{
"af": "afade=t=in:st=0:d=4, afade=t=out:st=13:d=3",
"to": "16",
},
})
assembly.AddStep("exported", map[string]interface{}{
"use": ["encode_audio", ":original"],
"robot": "/s3/store",
"credentials": "YOUR_AWS_CREDENTIALS",
"url_prefix": "https://demos.transloadit.com/",
})
// Add files to upload
assembly.AddFile("joakim_karud-rock_angel.mp3"))
// 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["encode_audio"][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> encode_audioStepOptions = new HashMap();
encode_audioStepOptions.put("use", ":original");
encode_audioStepOptions.put("result", true);
encode_audioStepOptions.put("ffmpeg_stack", "v6.0.0");
encode_audioStepOptions.put("preset", "mp3");
encode_audioStepOptions.put("ffmpeg", {
"af": "afade=t=in:st=0:d=4, afade=t=out:st=13:d=3",
"to": "16",
});
assembly.addStep("encode_audio", "/audio/encode", encode_audioStepOptions);
Map<String, Object> exportedStepOptions = new HashMap();
exportedStepOptions.put("use", new String[] { "encode_audio", ":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("joakim_karud-rock_angel.mp3"));
// 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
}
}
}
So many ways to integrate
Transloadit is a service for companies with developers. As a developer, there are many ways
you can put us to good use.
-
Bulk imports
Add one of our import Robots to acquire and transcode massive media libraries. -
Handling uploads
We are the experts at reliably handling uploads. We wrote the protocol for it. -
Front-end integration
We integrate with web browsers via our next-gen file uploader Uppy and SDKs for Android and iOS. -
Back-end integration
-
Pingbacks
Configure anotify_urlto let your server receive transcoding results JSON in thetransloaditPOST field.
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