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Re:Show HN: Plopdown – HTML5 Video Annotator by degenerate on Friday May 22, 2020 @11:14AM (#23272980)
This looks very nice for teachers. But having to install the extension is the limiting factor that doesn't make it practical for mass use.

The demo is on the homepage, fyi: https://plopdown.video/

Re:Show HN: Plopdown – HTML5 Video Annotator by spaceribs on Friday May 22, 2020 @11:26AM (#23273120)
I think the next real gamechanger for this project will probably be "plopdown.video/share/xyz" links.

You should be able to store a track pretty much anywhere (github gists, pastebin) then associate them with a video and share the setup via that link. If you don't have the extension installed, it would show a preview and will prompt you to install the extension before proceeding.

Re:Show HN: Plopdown – HTML5 Video Annotator by cxam on Friday May 22, 2020 @07:35PM (#23278331)
I built something similar that might work depending on your use case and doesn't require installing an extension. Check out https://tagx.io/

However, it doesn't overlay any annotations over the video like plopdown does (which is a great feature!), only on the side of the video.