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Life & fun · August 24, 2019

YD

YouTube Decade – The most-viewed videos posted 10 years ago

Does the same job

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  • Ten Years Ago2017 · ▲336

    See what was happening on the Internet ten years ago

  • Play20Back2015 · ▲91

    Play videos from MTV from exactly 20 years ago

  • AC
  • PM
    Play20Back – MTV as It Looked 20 Years Ago2015 · play20back.com · ▲61
  • YTGREP2022 · ▲73

    Extract the top most replayed time from YouTube videos

  • RY
    Reversing YouTube’s “Most Replayed” GraphJan 2026 · priyavr.at · ▲87

    Hi HN, I recently noticed a recurring visual artifact in the "Most Replayed" heatmap on the YouTube player. The highest peaks were always surrounded by two dips. I got curious about why they were there, so I decided to reverse engineer the feature to find out. This post documents the deep dive. It starts with a system design recreation, reverse engineering the rendering code, and ends with the mathematics. This is also my first attempt at writing an interactive article. I would love to hear your thoughts on the investigation and the format.

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Launched alongside, August 2019

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