How to extract audio from Youtube video files?

pip install yt-dlp assemblyai

from google.colab import userdata

import assemblyai as aai

aai.settings.api_key = userdata.get('AAI_KEY')

import yt_dlp

def download_audio(url):

    ydl_opts = {

        'format': 'bestaudio/best',

        'postprocessors': [{

            'key': 'FFmpegExtractAudio',

            'preferredcodec': 'mp3',

            'preferredquality': '192',

        }],

        'outtmpl': '%(title)s.%(ext)s',

        'verbose': True,

    }

    with yt_dlp.YoutubeDL(ydl_opts) as ydl:

        ydl.download([url])

URL = "https://www.youtube.com/watch?v=wB7IU0EFN68"

download_audio(URL)

audio_file = f'{video_title}.mp3'

Transcribing audio 

transcriber = aai.Transcriber()

transcript = transcriber.transcribe(audio_file)

prompt = "What are the 5 key messages that was mentioned in this video?"

result = transcript.lemur.task(

    prompt,

    final_model=aai.LemurModel.claude3_5_sonnet

)

print(result.response)

References:

https://towardsdatascience.com/i-coded-a-youtube-ai-assistant-that-boosted-my-productivity-bdda884d4104