Download Youtube audio, speed it up, and automatically copy it to iTunes

dl-speedup-youtube.py

import argparse
import shutil

import ffmpy
import youtube_dl

itunes_folder = (
    "/Path/To/Automatically Add to Music Folder"
)


class FilenameCollectorPP(youtube_dl.postprocessor.common.PostProcessor):
    def __init__(self):
        super(FilenameCollectorPP, self).__init__(None)
        self.filenames = []

    def run(self, information):
        self.filenames.append(information["filepath"])
        return [], information


def download_audio(url):
    options = {
        "format": "bestaudio/best",
        "postprocessors": [
            {
                "key": "FFmpegExtractAudio",
                "preferredcodec": "mp3",
                "preferredquality": "320",
            }
        ],
        "outtmpl": "%(title)s.%(ext)s",
    }

    ydl = youtube_dl.YoutubeDL(options)
    filename_collector = FilenameCollectorPP()
    ydl.add_post_processor(filename_collector)
    ydl.download([url])

    return filename_collector.filenames[0]


def speed_up_audio(file_name, speed=2.0):
    new_fname = f"{file_name.split('mp3')[0]}_sped_up.mp3"
    ff = ffmpy.FFmpeg(
        inputs={file_name: None},
        outputs={new_fname: ["-filter:a", f"atempo={speed}"]},
    )
    ff.run()
    return new_fname


if __name__ == "__main__":
    parser = argparse.ArgumentParser(description="Download audio from YouTube")
    parser.add_argument("url", help="URL of the YouTube video")
    parser.add_argument("--speed", nargs="?", help="Speed of the audio", type=float)
    args = parser.parse_args()
    fname = download_audio(args.url)
    new_fname = speed_up_audio(fname, args.speed)
    shutil.copy(new_fname, itunes_folder)