Download all JWPlatform's videos from a single page

[acidrums4]

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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2017.12.31. If it's not, read this FAQ entry and update. Issues with outdated version will be rejected.

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Description of your issue, suggested solution and other information

I was trying to download all the videos contained from this single post (yep, I'm pretty much a noob making knots):

https://gearpatrol.com/2017/12/30/how-to-tie-knots/

However, no matter what I tried, youtube-dl always downloaded just the first video listed there (Our Go-To: Water Knot).

$ youtube-dl https://gearpatrol.com/2017/12/30/how-to-tie-knots/
[generic] how-to-tie-knots: Requesting header
WARNING: Falling back on generic information extractor.
[generic] how-to-tie-knots: Downloading webpage
[generic] how-to-tie-knots: Extracting information
[JWPlatform] gtspKaEb: Downloading JSON metadata
[JWPlatform] gtspKaEb: Downloading m3u8 information
[hlsnative] Downloading m3u8 manifest
[hlsnative] Total fragments: 12
[download] Destination: GP - How to Tie - Water Knot.mp4-gtspKaEb.mp4
[download] 100% of 4.82MiB in 00:17
[ffmpeg] Fixing malformed AAC bitstream in "GP - How to Tie - Water Knot.mp4-gtspKaEb.mp4"

On an attempt of knowing what was going on, I went sniffing into the code of the post and I learned those were JWPlayer videos. So I ended sed'ing the code to get the JWPlayer URLS, throwing them onto a file and use it to download them with 'youtube-dl -a'.

All of this is because I was expecting youtube-dl to download all of the videos contained there, pretty much like when you give a YouTube channel/playlist URL to youtube-dl, but not just the first video it found.