Youtube Downloader

Command-line youtube downloader for watching high-resolution videos with captions offline. Audio(mp3) and captions(srt) files can be also downloaded.

Setup

To edit videos you need to install ffmpeg.

$ brew install ffmpeg

First you need to install dependencies.

$ pip install -r requirements.lock

You can also use Rye.

$ rye sync

Dealing with pytube Error

issues

revise .venv/lib/python3.12/site-packages/pytube/cipher.py in line 264 to the following code.

function_patterns = [
        # https://github.com/ytdl-org/youtube-dl/issues/29326#issuecomment-865985377
        # https://github.com/yt-dlp/yt-dlp/commit/48416bc4a8f1d5ff07d5977659cb8ece7640dcd8
        # var Bpa = [iha];
        # ...
        # a.C && (b = a.get("n")) && (b = Bpa[0](b), a.set("n", b),
        # Bpa.length || iha("")) }};
        # In the above case, `iha` is the relevant function name
        r'a\.[a-zA-Z]\s*&&\s*\([a-z]\s*=\s*a\.get\("n"\)\)\s*&&.*?\|\|\s*([a-z]+)',
        r'\([a-z]\s*=\s*([a-zA-Z0-9$]+)(\[\d+\])?\([a-z]\)',
        r'\([a-z]\s*=\s*([a-zA-Z0-9$]+)(\[\d+\])\([a-z]\)',
    ]

[UPDATE: 2024/08/11] issues

#pattern = r"%s=function\(\w\){[a-z=\.\(\"\)]*;(.*);(?:.+)}" % name
pattern = r"%s=function\(\w\){[a-z=\.\(\"\)]*;((\w+\.\w+\([\w\"\'\[\]\(\)\.\,\s]*\);)+)(?:.+)}" % name

Usage

Downloading video(with audio and captions)

$ python src/main.py <YOUTUBE_ID>

Downloading video(without combining audio)

Since combining a video and its audio with ffmpeg is compute-intensive, you can skip the procedure with --download_only flag.

$ python src/main.py <YOUTUBE_ID> --download_only 1

Specifing resolution

$ python src/main.py <YOUTUBE_ID> -r 720p

Downloading audio

$ python src/main.py <YOUTUBE_ID> -m audio -o music --srt 0 --metadata false -f favorite_song

This command saves the audio data of to outputs/music/favorite_song.mp3. No video, captions, or url.txt.