[PYTHON] The guy who downloads audio from YouTube playlists

What to do later

Skip private videos with guys that can only be seen on youtube premium and move on to the next video Unable to extract JS player Force termination when URL appears

What to use

• Python 3.9.0
• YouTube-dlc 2020.10.26

YouTube-dlc is a python tool forked from YouTube-dl Forked because youtube-dl was updated infrequently YouTube-dl is eating DMCA takedown, so is YouTube-dlc recommended?

How to use

python main.py <Playlist id> <Output relative path>

Implementation

--YoutubeDLError is the inheritance source of all YouTube-dl errors --You can make videos by playing with the format and postprocessors of download_opts. ――We change UA every time

import youtube_dlc
import json
import time
import random
import os
import sys


def download_video(download_opts,urlnum,urllist):
    with youtube_dlc.YoutubeDL(download_opts) as ydl:
        i = 0
        for url in urllist:
            while True:
                try:
                    ydl.extract_info(url, download=True)
                    wait_time(5, 20)                    
                except KeyboardInterrupt:
                    print("\nKeyboardInterrupt")
                    exit(1)
                except youtube_dlc.utils.YoutubeDLError:
                    youtube_dlc.utils.std_headers['User-Agent']=youtube_dlc.utils.random_user_agent()
                    wait_time(1, 10)
                except:
                    print("\nother error")
                    exit(1)
                else:
                    youtube_dlc.utils.std_headers['User-Agent']=youtube_dlc.utils.random_user_agent()
                    i += 1
                    print(
                        "\n\nDownloaded Items " + str(i) + "/" + str(urlnum) + "\n\n"
                        "--------------------------------------------------------------"
                    )
                    break

def flat_playlist(flat_list):
    with youtube_dlc.YoutubeDL(flat_list) as ydl:
        try:
            info_dict = ydl.extract_info(playlist, download=False)
        except youtube_dlc.utils.YoutubeDLError:
            print("\nNot get playlist. Check playlist-id and retry")
            exit(1)
        except:
            print("\nother error")
            exit(1)
        o = json.loads(json.dumps(info_dict, ensure_ascii=False))
    urllist = []
    for items in o["entries"]:
        urllist.append("https://www.youtube.com/watch?v=" + items["id"])
    urlnum = len(urllist)
    return urlnum, urllist

def wait_time(s, e):
    sleeptime = random.randrange(s, e) + random.random()
    print("wait for " + str(f"{sleeptime:.1f}"))
    time.sleep(sleeptime)


if __name__ == "__main__":

    try:
        playlist = "https://www.youtube.com/playlist?list="+sys.argv[1]
        outputpath = "./"+sys.argv[2]
    except IndexError:
        print("Arguments are playlist-id output-path")
        exit(1)


    if not os.path.exists(outputpath):
        print("Make output directory --> " + outputpath)
        os.makedirs(outputpath)


    flat_list = {
        "extract_flat": True,
    }
    urlnum,urllist=flat_playlist(flat_list)

    print(
        "--------------------------------------------------------------\n"
        "\ndownload items " + str(urlnum) + "\n"
        "download start\n\n"
        "--------------------------------------------------------------"
    )


    download_opts = {
        "format": "bestaudio/best",
        "outtmpl": outputpath + "/%(title)s.%(ext)s",
        "postprocessors": [
            {
                "key": "FFmpegExtractAudio",
                "preferredcodec": "mp3",
                "preferredquality": "256",
            }
        ],
    }
    download_video(download_opts,urlnum,urllist)

    print("\nDownload complete\n")