Bold Transcripts

A simple Elixir library for working with Bold Video transcripts. Convert transcripts from various providers (AssemblyAI, Deepgram) to Bold's unified transcript format, and generate WebVTT subtitles.

Installation

Add bold_transcripts_ex to your list of dependencies in mix.exs:

def deps do
  [
    {:bold_transcripts_ex, "~> 0.6.0"}
  ]
end

Usage

Converting Transcripts

Convert transcripts from supported providers to Bold format:

# Convert from AssemblyAI
{:ok, bold_transcript} = BoldTranscriptsEx.convert(:assemblyai, assemblyai_json)

# Convert from Deepgram
{:ok, bold_transcript} = BoldTranscriptsEx.convert(:deepgram, deepgram_json, language: "en")

Generating Subtitles

Create WebVTT subtitles from a Bold transcript:

webvtt = BoldTranscriptsEx.generate_subtitles(bold_transcript)

Working with Chapters

Convert chapters to WebVTT format:

# From AssemblyAI transcript
{:ok, chapters_vtt} = BoldTranscriptsEx.chapters_to_webvtt(:assemblyai, transcript)

# From a list of chapters
chapters_vtt = BoldTranscriptsEx.chapters_to_webvtt([
  %{start: "0:00", end: "1:30", title: "Introduction"},
  %{start: "1:30", end: "5:45", title: "Main Content"}
])

Bold Transcript Format

The Bold transcript format is a unified JSON structure that combines metadata and utterances as segments of speech:

{
  "metadata": {
    "version": "2.0",
    "duration": 34.789,
    "language": "en",
    "source_url": "",
    "source_vendor": "assemblyai",
    "source_version": "1.2.3",
    "transcription_date": "2024-12-19T12:00:00Z",
    "speakers": ["A", "B", "C"]
  },
  "text": "Hey, how are you?",
  "utterances": [
    {
      "text": "Hey, how are you?",
      "start": 0.64,
      "end": 1.84,
      "speaker": "A",
      "confidence": 0.98789,
      "words": [
        {
          "word": "Hey",
          "start": 0.64,
          "end": 0.84,
          "confidence": 0.951
        },
        {
          "word": "how",
          "start": 0.85,
          "end": 1.04,
          "confidence": 0.962
        },
        {
          "word": "are",
          "start": 1.05,
          "end": 1.24,
          "confidence": 0.981
        },
        {
          "word": "you?",
          "start": 1.25,
          "end": 1.84,
          "confidence": 0.99
        }
      ]
    }
  ]
}

License

This project is licensed under the MIT License. See the LICENSE file for details.

Links

• Bold Video
• Documentation
• GitHub