Comment télécharger des chapitres d'une vidéo YouTube sous forme de fichiers vidéo distincts?

Question

Une nouvelle fonctionnalité YouTube

YouTube a récemment activé l'option de ((( Ajouter des chapitres dans des vidéos YouTube.

Ceci est fait en ajoutant simplement le chapitre Timestamps (heure de début) dans la description de la vidéo.

Rubriques connexes

En utilisant youtube-dl nous pouvons

Téléchargez une partie d'une vidéo YouTube en fournissant le start time et duration.

extraire la description d'une vidéo YouTube.description des dossiers.

QUESTION

Existe-t-il une commande unique pour télécharger des chapitres d'une vidéo YouTube sous forme de fichiers vidéo distincts sans Fournir le start time et duration il extrait automatiquement les horodatages de l'.description?

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Answer 1

Vous ne pouvez pas faire cela directement. J'ai écrit un Python script qui téléchargera l'ensemble du fichier, traiter le fichier de description, puis diviser le fichier téléchargé dans les chapitres de ses composants.

Utilisation - Si vous enregistrez cela dans un fichier appelé "yt_chapters.py", puis exécutez

yt_chapters.py --split "https://www.youtube.com/watch?v=m5lp8S-YgrQ"

Vous pouvez transmettre plusieurs liens de téléchargement et utilisera la liste.

L'enregistrement de chapitre sera ajouté à l'original téléchargé MP4.

Conditions requises: YouTubedl, FFMPEG et MP4BOX (GPAC). Si vous ne voulez pas conserver le MP4 d'origine, ou si vous ne vous en souciez pas de la chapitre, vous pouvez commenter cette section. YouTubedl et FFMPEG devraient être dans votre chemin système ou pour modifier le code ci-dessous pour inclure le chemin complet sur les exécutables.

#! /usr/bin/env python
# -*- coding: utf-8 -*-

import subprocess, os, argparse, datetime, re, sys

def get_source_name(download_source:str)->str:

    # Get the expected filename in order to process everything down the line
    result = subprocess.run(["youtube-dl", "--get-filename",
                            "-o", "%(title)s", download_source],
                            capture_output=True, encoding='UTF8')
    return result.stdout.rstrip('\n')

def get_best_mp4_single_file(download_source:str, description_file:str,
                             fix_required:bool=False)->list:

    # Download the file as mp4 (in order to use MP4)
    subprocess.run(["youtube-dl", "--write-description", "-f",
                    "bestvideo[ext=mp4]+bestaudio[ext=m4a]/mp4",
                    "-o", "%(title)s.%(ext)s", link_to_download])
    if fix_required:
        input("Fix the description file to have the chapters "
              "on their own lines in the format timecode name "
              "and then press Enter to continue...")
    return read_description_file(description_file=description_file)

def get_worst_mp4_single_file(download_source:str, description_file:str,
                              fix_required:bool=False)->list:

    # Download the file as mp4 (in order to use MP4)
    subprocess.run(["youtube-dl", "--write-description", "-f",
                    "worstvideo[ext=mp4]+worstaudio[ext=m4a]/mp4",
                    "-o", "%(title)s.%(ext)s", link_to_download])
    if fix_required:
        input("Fix the description file to have the chapters "
              "on their own lines in the format timecode name "
              "and then press Enter to continue...")
    return read_description_file(description_file=description_file)

def add_chapters_to_mp4(chapter_file_name:str, name_for_download:str)->None:

    # Use MP4Box to mux the chapter file with the mp4
    subprocess.run(["MP4Box", "-chap", chapter_file_name, name_for_download])

def read_description_file(description_file:str)->list:

    # Read the description file
    # Split into time and chapter name

    list_of_chapters = []

    with open(description_file, 'r') as f:
        # only increment chapter number on a chapter line
        # chapter lines start with timecode
        line_counter = 1
        for line in f:
            result = re.search(r"\(?(\d?[:]?\d+[:]\d+)\)?", line)
            try:
                # result = re.search("\(?(\d+[:]\d+[:]\d+)\)?", line)
                time_count = datetime.datetime.strptime(result.group(1), '%H:%M:%S')
            except:
                try:
                    # result = re.search("\(?(\d+[:]\d+)\)?", line)
                    time_count = datetime.datetime.strptime(result.group(1), '%M:%S')
                except:
                    continue
            chap_name = line.replace(result.group(0),"").rstrip(' :\n')
            chap_pos = datetime.datetime.strftime(time_count, '%H:%M:%S')
            list_of_chapters.append((str(line_counter).zfill(2), chap_pos, chap_name))
            line_counter += 1

    return list_of_chapters

def write_chapters_file(chapter_file:str, chapter_list:Tuple)->None:

            #open(chapter_file, 'w').close()

            # Write out the chapter file based on simple MP4 format (OGM)
            with open(chapter_file, 'w') as fo:
                for current_chapter in chapter_list:
                    fo.write(f'CHAPTER{current_chapter[0]}='
                            f'{current_chapter[1]}\n'
                            f'CHAPTER{current_chapter[0]}NAME='
                            f'{current_chapter[2]}\n')


def split_mp4(chapters:list, download_filename:str, download_name:str)->None:

    # current_duration = subprocess.run(['ffprobe', '-i', download_filename,
                                       # '-show_entries', 'format=duration',
                                       # '-v', 'quiet', '-of', 'csv="p=0"'],
                                        # capture_output=True, encoding='UTF8')
    current_duration_pretext = subprocess.run(['ffprobe', '-i', download_filename,
                                       '-show_entries', 'format=duration',
                                       '-v', 'quiet'],
                                        capture_output=True, encoding='UTF8')
    current_duration = float(current_duration_pretext.stdout[18:-13])
    m, s = divmod(current_duration, 60)
    h, m = divmod(m, 60)
    current_dur = ':'.join([str(int(h)),str(int(m)),str(s)])
    for current_index, current_chapter in enumerate(chapters):
        # current_chapter will be a Tuple: position, timecode, name
        next_index = current_index + 1
        start_time = current_chapter[1]
        try:
            end_time = chapters[next_index][1]
        except:
            end_time = current_dur
        output_name = f'{download_name} - ({current_chapter[2]}).mp4'
        subprocess.run(["ffmpeg", "-ss", start_time, "-to", end_time,
                        "-i", download_filename, "-acodec", "copy",
                        "-vcodec", "copy", output_name])

if __name__ == '__main__':

    parser = argparse.ArgumentParser(description='Download Youtube videos with chapters')

    parser.add_argument('links', metavar='N', type=str, nargs='+',
                        help='List of links to download')

    parser.add_argument("--split", help="Split chapters into individual files",
                        action="store_true")
    parser.add_argument("--test", help="Download worst version to speed up testing",
                        action="store_true")
    parser.add_argument("--fix", help="Pause to allow manual correction of the description file",
                        action="store_true")
    args = parser.parse_args()
    # print(args.links)

    for link_to_download in args.links:

        download_name = get_source_name(download_source=link_to_download)
        download_filename = f'{download_name}.mp4'
        description_file = f'{download_name}.description'
        chapter_file = f'{download_name}_chapter.txt'

        if not args.test:
            chapters = get_best_mp4_single_file(download_source=link_to_download,
                                                description_file=description_file,
                                                fix_required=args.fix)
        else:
            chapters = get_worst_mp4_single_file(download_source=link_to_download,
                                                description_file=description_file,
                                                fix_required=args.fix)

        
        if not chapter_file:
            print("No chapters found")
            sys.exit(1)
        
        write_chapters_file(chapter_file=chapter_file, chapter_list=chapters)

        if args.split:
            split_mp4(chapters=chapters, download_filename=download_filename,
                      download_name=download_name)
        
        add_chapters_to_mp4(chapter_file_name=chapter_file,
                              name_for_download=download_filename)

        # Clean up the text files
        os.remove(description_file)
        os.remove(chapter_file)