youtube-dl

https://github.com/ytdl-org/youtube-dl

youtube-dl <URL>

youtube-dl --write-description --write-auto-sub --sub-lang es <URL>

List subtitles: youtube-dl --list-subs <URL>

Use --skip-download if you want to get the subtitles or description only.

Video format

• Use --list-formats to get the 'format code', a number like 139 or 251. Eg to list a YouTube video formats do: youtube-dl https://www.youtube.com/watch?v=isd5zPzuM --list-formats.
• Once you have the 'format code' you can do: youtube-dl https://www.youtube.com/watch?v=isd5zPzuM -f 244.
• Make sure to not pick a 'video only' format otherwise you don't get any audio :/

Quality

• See options at https://github.com/ytdl-org/youtube-dl/#format-selection
• -f 'bestvideo[height<=480]+bestaudio'
• '-f bestvideo[width<=1200]+bestaudio'
• -f worstvideo o -f worst

Example: youtube-dl https://www.youtube.com/watch?v=ioEAR_zPzuM -f 'bestvideo[width<=1200]+bestaudio'

Download audio

youtube-dl -x [--audio-quality 0] [--audio-format "flac"] <URL>

• --audio-quality QUALITY: 0 is the best, 9 the worst
• --audio-format FORMAT: "best", "aac", "flac", "mp3", "m4a", "opus", "vorbis", or "wav"; "best" by default

Also see https://github.com/yt-dlp/yt-dlp