The /media/playlist Robot

We can enrich media files with meta data and generate playlists for them.

The /media/playlist Robot merges segment files to generate playlist files for HTTP Live Streaming (HLS).


Name Type Default Description
use (required) String / Array of Strings


Specifies which Step(s) to use as the input to this Robot.

Special Step names

A special Step name is ":original", which provides user uploads handled by Transloadit.

Providing several Steps as input

You can add arrays to use several Steps:
"use": [

Step bundling

Some Robots can gather several Step results for a single invocation. For example, the /file/compress Robot would normally create one Zip file for each file passed to it. If you'd set bundle_steps to true, however, it will create one archive containing all the result files from all Steps you give it. To enable bundling, provide an object like the one below to the use parameter:
  "use": {
    "steps": [
    "bundle_steps": true
This is a crucial parameter for the /video/adaptive Robot, otherwise you'll generate 1 playlist for each viewing quality.
Keep in mind that all input Steps must be present in your Template. If one of them is missing, no result is generated because the Robot waits indefinitely for all input Steps to be finished.

Group by original

Sticking with the /file/compress Robot example, you can set group_by_original to true, in order to create a separate Zip file for each of your uploaded or imported files, instead of creating one archive containing all originals (or one per resulting file). This is a crucial parameter for the /media/playlist Robot.


See a demo for the use parameter here.
name String "playlist.m3u8" The final name of the playlist file.
relative_to String "" URL prefixes to use in the playlist file. Example: "/234p/"
resolution String "" The resolution reported in the playlist file. Example: "416×234". More info.
codecs String "" The codecs reported in the playlist file. Example: "avc1.42001e,mp4a.40.34". More info.
bandwidth String("auto") / Integer "auto" The bandwidth reported in the playlist file. Example: 2560000. More info. This value is expressed in bits per second.
meta_name String "" The meta name as used for NAME in the #EXT-X-STREAM-INF path in playlists. Can be different from the (file)name.
protocol String "http" The URL protocol used for all URLs in playlists. Can be "http" or "https".


Our /media/playlist Robot can be used in combination with other Robots, to create powerful workflows unique to your use case. Here are a few example scenarios that you can try live on our website:

Blog posts about the /media/playlist Robot

We wrote the following posts about the /media/playlist Robot on our blog:

Did you know?

You can easily combine Robots to create powerful workflows, unique to your business.
This is the power of Transloadit.