How a VOD Chat Sync Tool Ditched Binary Search for a Simpler Approach

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A developer building NoSub, a browser-based VOD player for Twitch and Kick, faced the challenge of syncing chat replays accurately to video timelines. Rather than using binary search or elapsed-time tracking, the solution anchors each chat message to the VOD's own start timestamp, eliminating drift caused by pausing or seeking. When a user seeks to a new position, all buffered messages are discarded and a fresh server request fetches chat from the new timestamp, skipping everything in between. A session counter guards against stale async responses that could inject out-of-order messages after a seek. With the message buffer capped at 600 entries, a simple linear scan proved sufficient, making binary search an unnecessary complexity for this scale.

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