Decompress archives

🤖/file/decompress extracts entire archives of files to be consumed by other Robots or exported as individual files.

Usage example

{
  "steps": {
    "decompressed": {
      "robot": "/file/decompress",
      "use": ":original"
    }
  }
}

Parameters

• interpolate

  boolean | Record<string, boolean>

  Controls whether Assembly Variables are interpolated for individual instruction fields.

  By default, most Robot instruction fields interpolate Assembly Variables. Set this to false to treat every instruction field as literal text, or set an individual field path to false to treat only that field as literal text. For Robot-specific fields that are literal by default, set this to true or set that field path to true to opt back into interpolation.

  Use field names such as path, or dotted paths such as ffmpeg.vf for nested objects.

• output_meta

  Record<string, boolean> | boolean | Array<string>

  Allows you to specify a set of metadata that is more expensive on CPU power to calculate, and thus is disabled by default to keep your Assemblies processing fast.

  For images, you can add "has_transparency": true in this object to extract if the image contains transparent parts and "dominant_colors": true to extract an array of hexadecimal color codes from the image.

  For images, you can also add "blurhash": true to extract a BlurHash⁠ string — a compact representation of a placeholder for the image, useful for showing a blurred preview while the full image loads.

  For videos, you can add the "colorspace": true parameter to extract the colorspace of the output video.

  For videos, you can also add "interlaced": true to detect whether the video is interlaced. This combines the cheap ffprobe field_order flag with a bounded idet sampling pass over the first frames of the source, exposing interlaced, field_order, and a diagnostic interlace_detection object under file.meta. This is computationally expensive and billed accordingly.

  For audio, you can add "mean_volume": true to get a single value representing the mean average volume of the audio file.

  You can also set this to false to skip metadata extraction and speed up transcoding.

• user_meta

  Record<string, any>(default: {})

  Adds custom metadata to each file emitted by this Robot without modifying the file’s contents.

  The values are merged with any existing user_meta carried by the input file. If both objects contain the same key, this Robot’s value takes precedence. Assembly Variables are supported, for example { "internal_file_id": "${file.id}" }.

• result

  boolean(default: false)

  Whether the results of this Step should be present in the Assembly Status JSON

• queue

  batch

  Setting the queue to 'batch', manually downgrades the priority of jobs for this step to avoid consuming Priority job slots for jobs that don't need zero queue waiting times

• force_accept

  boolean(default: false)

  Force a Robot to accept a file type it would have ignored.

  By default, Robots ignore files they are not familiar with. 🤖/video/encode, for example, will happily ignore input images.

  With the force_accept parameter set to true, you can force Robots to accept all files thrown at them. This will typically lead to errors and should only be used for debugging or combatting edge cases.

• ignore_errors

  boolean | Array<meta | execute>(default: [])

  Ignore errors during specific phases of processing.

  Setting this to ["meta"] will cause the Robot to ignore errors during metadata extraction.

  Setting this to ["execute"] will cause the Robot to ignore errors during the main execution phase.

  Setting this to true is equivalent to ["meta", "execute"] and will ignore errors in both phases.

  Metadata extraction can fail for files inside an archive, for example when an archived file has a size of zero bytes. Configure the "meta" phase when decompression should continue in that case.

• use

  string | Array<string> | Array<object> | object

  Specifies which Step(s) to use as input.

  • You can pick any names for Steps except ":original" (reserved for user uploads handled by Transloadit)
  • You can provide several Steps as input with arrays:

    {
      "use": [
        ":original",
        "encoded",
        "resized"
      ]
    }
    

  • You can also tag input Steps with as to pass semantic intent to robots:

    {
      "use": [
        {
          "name": ":original",
          "as": "image"
        },
        {
          "name": ":original",
          "as": "mask"
        }
      ]
    }
    

  Tip

  That's likely all you need to know about use, but you can view Advanced use cases.

• password

  string

  The password to use for decrypting password-protected archives.

  Supports encrypted ZIP (ZipCrypto and AES), RAR (encrypted), and 7z (AES-256 encrypted) archives.

  For security, this value should be passed via Template Variables (${fields.archive_password}) or Template Credentials rather than hardcoded in your Assembly Instructions. The password is never logged or included in Assembly status responses.

  If the archive is encrypted and no password is provided, or if the password is incorrect, the Assembly will fail with a FILE_DECOMPRESS_PASSWORD_REQUIRED or FILE_DECOMPRESS_PASSWORD_INCORRECT error.

• turbo

  boolean(default: true)

  Enables Turbo Mode for /file/decompress.

  This setting defaults to true. Set it to false to disable Turbo Mode.

  When enabled, extracted files are emitted as soon as they are available, which can speed up downstream processing for large archives.

  Turbo Mode also changes usage accounting: emitted extracted-file bytes and original input-archive bytes are billed with a surcharge (25% by default).

Demos

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