How can I download the video description of a YouTube video without downloading the video with youtube-dl?
You can use the following options:
--write-description--skip-download--youtube-skip-dash-manifest
Example
youtube-dl https://www.youtube.com/watch?v=4o0r9unT4L4 --write-description --skip-download --youtube-skip-dash-manifest
Descriptions are downloaded as .description files, which are just normal text files.
Note that if a video description is blank, a 0-byte file will be produced.
References
youtube-dl - Only download descriptions - Issue #8593
youtube-dl - Official Documentation