The /meta/write Robot

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

The /meta/write Robot write meta data into any file that supports it.


Name Type Default Description
data_to_write Object {} A key/value map defining the meta data to write into the file.
ffmpeg_stack String "v1.0.0" Selects the FFmpeg stack for the encoding. Valid values are "v1.0.0" , "v2.0.0", "v2.1.0" and "v2.2.3". These versions do not reflect any real FFmpeg versions, they reflect our own internal (non-semantic) versioning for our custom FFmpeg builds. The recommended value here is "v2.2.3".

Live demos

Our /meta/write Robot can be used in combination with other Robots, to create powerful workflows unique to your use case.
Here are a few example scenarios, and the required the Assembly Instructions to implement them.
You can also try demos of these examples right here, live on our website.

Write meta data to an image

  "steps": {
    "attributed": {
      "use": [":original"],
      "robot": "/meta/write",
      "result": true,
      "data_to_write": {"copyright":"Copyright 2018 Transloadit"}
    "exported": {
      "use": ["attributed", ":original"],
      "robot": "/s3/store",
      "credentials": "demo_s3_credentials"

our /meta/write Robot blog posts

Over the years we wrote the following posts about our /meta/write 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.