Slipstream Live — Detect and Adjust Live Stream Latency Automatically

Description

Detects stream latency on YouTube, Twitch, and TwitCasting, and adjusts playback speed to catch up to the live edge in real time. There's always a delay of a few seconds between the moment a streamer speaks and the moment you see it. That delay grows every time the connection hiccups, and it never shrinks back on its own. You can catch up by manually switching to 1.25x speed, but then you're stuck watching your own buffer level and have to slow back down before it runs dry. Forget, and the video freezes on that spinning buffering icon. Slipstream Live takes over that watch duty for you, checking about 50 times a second. Works with YouTube Live, Twitch, and TwitCasting. Install it, and you're done — nothing else to do. ■ Never freezes, never overreacts. Built for stability It speeds up only when there's real headroom in the buffer (1.25x by default), and eases down to as low as 0.15x — turning the volume down with it — right before the buffer runs out. Because the brakes always kick in a moment before the spinner would, you never get frozen out from overshooting. To stop the speed from flip-flopping right at the threshold, there's some built-in give (hysteresis) around the edges. The moment you change the speed yourself in the player, Slipstream Live hands control straight back to you (Twitch has no speed menu, so instead it quietly avoids fighting with Twitch's own catch-up feature). Volume ducking is temporary too — it never rewrites your actual volume setting. On top of a 20ms timer, it also checks state through the video's own events, so control keeps working even when the browser throttles timers on background tabs. ■ Under the hood, it gets pretty serious: predicting the buffer's "valleys" statistically Video arrives in chunks (segments) a few seconds long, so the buffer level traces a sawtooth wave — up, then down, over and over. Catch a peak by chance and speed up, and the buffer can run dry at the very next valley and freeze. So instead of trusting any single reading, Slipstream Live statistically estimates the valley itself, from a short-term average and standard deviation. 　trough = average − √3 × standard deviation Thanks to a property of the uniform distribution, this finds the valley without ever needing to know the stream's segment length. It also cleanly subtracts out any buffer drop caused by its own acceleration before running the stats, so it never falls into a feedback loop of "speed up → run dry → slow down → speed up again." During moments when the buffer level itself is shifting — right after a stream starts, or right after recovering from a stall — it treats things as "not settled yet" and pauses the valley estimate, so it never mixes in bad data. 　room (safety margin) = average of the valleys − K × how much the valleys vary Whenever there isn't enough data yet, this room automatically becomes "NaN," and the decision always defaults to false. In other words, "do nothing when unsure" is guaranteed by the logic itself, not just a promise. If you're curious, typing window.__slipstreamliveDebug = true into the page's console lets you watch internal values like room, drift, and calm live. "Auto-adjust buffer threshold" has three settings: off / standard / aggressive. On shaky connections it naturally stays conservative about speeding up; on stable streams it reliably gets you all the way to the live edge. ■ Tuned for every platform's quirks YouTube, Twitch, and TwitCasting each have completely different player internals and different habits for how their buffers drain. Since Twitch's video feed can drop out for about 10 seconds at a time, its max-deceleration threshold is set more generously; TwitCasting's buffer runs shallow by nature, so it's set thinner; Firefox reports buffer levels differently under the hood, so it gets its own dedicated defaults — tuned platform by platform like that. Streams where this kind of control simply can't work — like TwitCasting's low-latency (WebRTC) streams — are automatically excluded. It never touches VODs, clips, or ads, either. ■ Zero network activity It never connects to an external server — not once. No analytics, no telemetry, no identifiers, no ads. It only needs two permissions: "storage," and site access limited to the platforms it supports (YouTube, Twitch, TwitCasting). Settings aren't synced anywhere; they're stored locally on your device only. It also comes with an optional on-screen badge (off by default) showing playback speed, delay in seconds, and buffer level, a settings UI available in 9 languages, and a "?" help tooltip plus reset button on every setting. Keep chasing the stream's "now" — without having to keep watch yourself. Give Slipstream Live a try.

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