How to embed chapters and metadata on the embedding YT-DLP script?

Question

How to add chapters and metadata to video using the embedding script?
Thank you for your answer.

import yt_dlp

url = 'https://www.youtube.com/watch?v=BaW_jenozKc'

ydl_opts = {
    'format': 'bestvideo[height<=720][ext=mp4]+bestaudio[ext=m4a]/best[height<=720][ext=mp4]',
    'postprocessors': [ 
        {'key': 'FFmpegVideoConvertor', 'preferedformat': 'mp4'},
        {'key': 'EmbedThumbnail'},
        {'key': 'EmbedChapters'},
        {'key': 'EmbedMetadata'},
    ],
}
with yt_dlp.YoutubeDL(ydl_opts) as ydl:
    ydl.download(url)

Answer 1

Chapters should be added by default if you embed metadata (see embed-metadata), your test video doesn't seem to have any though. In order to EmbedThumbnail you should write it to disk first with writethumbnail:

import yt_dlp

url = 'https://www.youtube.com/watch?v=BaW_jenozKc'

ydl_opts = {
    'format': 'bestvideo[height<=720][ext=mp4]+bestaudio[ext=m4a]/best[height<=720][ext=mp4]',
    'postprocessors': [ 
        {'key': 'FFmpegVideoConvertor', 'preferedformat': 'mp4'},
        {'key': 'FFmpegMetadata'},
        {'key': 'EmbedThumbnail'}
    ],
    'writethumbnail': True
}
with yt_dlp.YoutubeDL(ydl_opts) as ydl:
    ydl.download(url)