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I've used many video downloaders before: atube catcher, 4k downloader, jDownloader, and currently using youtube-dl.I can't download videos, this for example, while still keeping their online chapters intact, like part1 is "intro" lasting from 00:00 to 00:45 and so on.So far I tried these parameters with youtube-dl
There is a recent open pull request for youtube-dl that fixes a problem with this information. In the current release of youtube-dl, if you use the ---write-info-json or --dump-json you will see that the chapters information is null ("chapters": null). You can use the code in the fork repository to be able to obtain the information you want.
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