vtt_builder

Simple and fast functions for building VTT formatted transcripts.

Assumptions

The builder functions makes a few assumptions.

First, it assumes that the data is stored either in JSON files or as a Python dict with the following keys - transcript and segments.

It also assumes that the transcript is already broken up into segments with the appropriate timestamps in the following schema - a list of these objects is what should be in segments:

key	type	description
id	integer	Unique, ordered identifier of the segment.
start	number	Start time of the segment in seconds.
end	number	End time of the segment in seconds.
text	string	Text content of the segment.

transcript should store the plain text of the segments together. This allows for combining text from multiple files.

Functions

build_vtt_from_json_files(file_paths: list(str), output_file: str)

Builds one VTT formatted transcript from one or more JSON files. The function will assume the file paths are provided in order. In this way, the output VTT transcript will build from the files before it, adding the start and end times as it goes to make the output one, coherent transcript.

Arguments:

• file_paths (list[str]): The JSON file paths that'll make up the transcript.
• output_file (str): The file path opf the output VTT formatted transcript.

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build_transcript_from_json_files

From plain text transcripts within multiple JSON files, build a single, plain text transcript with each chunk separated by a newline.

Arguments:

• file_paths (list[str]): The JSON file paths that'll make up the transcript.
• output_file (str): The file path opf the output VTT formatted transcript.

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build_vtt_from_records

From a list of segments - a list of Python dictionaries - build the VTT transcript.

Arguments:

• segments_list (list[dict]): A list of transcript segments (see schema above).
• output_file (str): The file path opf the output VTT formatted transcript.

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validate_vtt_file

Validate a VTT file.

Arguments:

• vtt_file (string): A complete file path to the vtt file.

Returns:

• (boolean): A true or false value indicating whether it's a valid VTT formatted file or not.

Example

test_fail = validate_vtt_file('/Users/user/not_vtt.json')
print(test_fail) # False

test_pass = validate_vtt_file('/Users/user/legit_vtt.vtt') 
# The extension does not matter
print(test_pass) # True

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