JSON::ParserError with different response_format - Whisper

[felipeequaresma]

Describe the bug
Whisper supports a few different response types like json, text, art, verbose json or vtt, when you set vtt for example it can't parse to json.

To Reproduce
Steps to reproduce the behavior:

1. Go to the terminal and to execute:

OpenAI::Client.new.transcribe(
        parameters: {
            model: 'whisper-1',
            file:  'your_file_path',
            response_format: 'vtt'
        })

2. See error

Expected behavior
response in all formats available for openAI

[mrmattnewell]

Same issue,

JSON::ParserError: unexpected token at 'WEBVTT

When I request response_format: "vtt"

This 100% used to work in previous versions of this gem.