Why live video dubbing lags a sentence behind and how buffered audio helps

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Real-time video translators usually voice translations about one sentence behind the speaker, because they must wait for a full sentence before translating it. Word order differs across languages, so translating partial sentences degrades quality, which creates a trade-off. For recorded videos, the browser preloads media ahead of the playhead, so a dubbing tool can recognize speech from that buffered audio. Sentences are assembled and translated before the viewer hears them, allowing the dub to start with the speaker. The approach works best with a small lookahead window, and seeking briefly resets it.

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