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AssemblyAI Audio Transcripts

The AssemblyAIAudioTranscriptLoader allows to transcribe audio files with the AssemblyAI API and loads the transcribed text into documents.

To use it, you should have the assemblyai python package installed, and the environment variable ASSEMBLYAI_API_KEY set with your API key. Alternatively, the API key can also be passed as an argument.

More info about AssemblyAI:


First, you need to install the assemblyai python package.

You can find more info about it inside the assemblyai-python-sdk GitHub repo.

%pip install --upgrade --quiet  assemblyai


The AssemblyAIAudioTranscriptLoader needs at least the file_path argument. Audio files can be specified as an URL or a local file path.

from langchain_community.document_loaders import AssemblyAIAudioTranscriptLoader

audio_file = ""
# or a local file path: audio_file = "./nbc.mp3"

loader = AssemblyAIAudioTranscriptLoader(file_path=audio_file)

docs = loader.load()

Note: Calling loader.load() blocks until the transcription is finished.

The transcribed text is available in the page_content:

"Load time, a new president and new congressional makeup. Same old ..."

The metadata contains the full JSON response with more meta information:

{'language_code': <LanguageCode.en_us: 'en_us'>,
'audio_url': '',
'punctuate': True,
'format_text': True,

Transcript Formats

You can specify the transcript_format argument for different formats.

Depending on the format, one or more documents are returned. These are the different TranscriptFormat options:

  • TEXT: One document with the transcription text
  • SENTENCES: Multiple documents, splits the transcription by each sentence
  • PARAGRAPHS: Multiple documents, splits the transcription by each paragraph
  • SUBTITLES_SRT: One document with the transcript exported in SRT subtitles format
  • SUBTITLES_VTT: One document with the transcript exported in VTT subtitles format
from langchain_community.document_loaders.assemblyai import TranscriptFormat

loader = AssemblyAIAudioTranscriptLoader(

docs = loader.load()

API Reference:

Transcription Config

You can also specify the config argument to use different audio intelligence models.

Visit the AssemblyAI API Documentation to get an overview of all available models!

import assemblyai as aai

config = aai.TranscriptionConfig(
speaker_labels=True, auto_chapters=True, entity_detection=True

loader = AssemblyAIAudioTranscriptLoader(file_path="./your_file.mp3", config=config)

Pass the API Key as argument

Next to setting the API key as environment variable ASSEMBLYAI_API_KEY, it is also possible to pass it as argument.

loader = AssemblyAIAudioTranscriptLoader(
file_path="./your_file.mp3", api_key="YOUR_KEY"

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