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You can only use Audio Region objects, and classifications to label audio files. See our end-to-end guide on labeling audio files to learn how to set up audio specific Ontologies.

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Labeling Audio Files

Navigate to the Queue tab of your Project and select the data unit you want to label. To label an audio region:
  1. Select a Audio Region class from the left side menu.
  2. Click and drag your cursor along the waveform to apply the label between the desired start and end points. Repeat this as many times necessary while the class is selected.
  3. If required, apply any attributes to the region.
  4. Repeat these steps for as many regions as necessary.
Audio regions can be copy-pasted using CMD / CTRL + C and CMD CTRL + V.
When assigning multiple Audio Region class labels to the same section of an audio file, hide overlapping labels.
To apply the classification to the entire audio file:
  1. Select the Classification from the left side menu.
  2. For radio buttons and checklists, select the value(s) you want to classification to have. For text classifications, enter the desired text.

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Audio Transcription

See our End-to-End guide for audio transcriptions here.
To create audio transcriptions, your Ontology must include Audio Region objects with Transcript attributes.
Navigate to the Queue tab of your Project and select the data unit you want to label. To transcribe an audio region:
  1. Select a Audio Region class from the left side menu.
  2. Click and drag your cursor along the waveform to apply the label between the desired start and end points.
  3. Apply the transcription attribute to the labeled audio region as text.
  4. Repeat these steps for as many regions as necessary.
When assigning multiple Audio Region class labels to the same section of an audio file, hide overlapping labels.

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Transcription Pane

The Audio Transcription Pane is available when your Ontology includes at least one Transcription attribute. To access it, click the icon at the top of the Label Editor. The Transcription Pane opens on the right side, displaying all transcriptions in chronological order.

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Long Audio Files

When audio files in your cloud storage are longer than an hour, the Label Editor may take extra time to load their waveforms. To significantly reduce load times, you can generate a JSON file containing the waveform data and store it alongside your audio file.
We STRONGLY recommend generating a waveform file for any audio files that are an hour or longer in duration.
  1. Install audiowaveform.
  2. Use the following command to generate a JSON file of your waveform:
The name of the JSON file must exactly match the name of your audio file. Only the file extensions differ.
audiowaveform -i ./input.mp3 -o ./waveform-output.json
  1. Upload the JSON file to the location of your audio file.
The JSON file MUST reside in the same cloud storage location as your audio file.For example:
  • Audio File Path in Bucket : “/my-bucket/all-audio/my-favorite-song.mp3”
  • Audio Waveform File Path in Bucket: “/my-bucket/all-audio/my-favorite-song.json”
You can upload the JSON file during audio file import or any time after.
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