The /audio/merge Robot

Transloadit offers a variety of features to reduce audio size while maintaining quality, as well as add effects like loops or watermarks.

The /audio/merge Robot overlays several audio files on top of each other.

Parameters

Name Type Default Description
preset String "mp3" Performs conversion using pre-configured settings. If you specify your own FFmpeg parameters using the Robot's ffmpeg parameter and you have not specified a preset, then the default "mp3" preset is not applied. This is to prevent you from having to override each of the mp3 preset's values manually. For a list of audio presets, see audio presets.
bitrate Integer Auto Bit rate of the resulting audio file, in bits per second. If not specified will default to the bit rate of the input audio file
sample_rate Integer Auto Sample rate of the resulting audio file, in Hertz. If not specified will default to the sample rate of the input audio file
duration String "longest" Duration of the output file compared to the duration of all merged audio files. Can be "first" (duration of the first input file), "shortest" (duration of the shortest audio file) or "longest" for the duration of the longest input file.

Live demos

Our /audio/merge 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.

Audio watermarking

{
  "steps": {
    "audio_imported": {
      "robot": "/http/import",
      "url": "http://demos.transloadit.com/inputs/bensound-energy.flac"
    },
    "merge": {
      "use": {"steps":[{"name":"audio_imported", "as":"audio"},{"name":":original", "as":"audio"}]},
      "robot": "/audio/merge",
      "result": true,
      "preset": "mp3"
    },
    "exported": {
      "use": ["audio_imported", "merge", ":original"],
      "robot": "/s3/store",
      "bucket": "demos.transloadit.com",
      "bucket_region": "us-east-1",
      "key": "YOUR_AWS_KEY",
      "secret": "YOUR_AWS_SECRET"
    }
  }
}

Our /audio/merge robot blog posts

Over the years we wrote the following posts about Our /audio/merge 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.