Show HN: Reversing YouTube’s “Most Replayed” Graph

Published: (January 15, 2026 at 09:06 PM EST)
1 min read

Source: Hacker News

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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 s…

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