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OBS itself is not the hard part — audio is. A cross-border stream carries at least three separate audio paths (original voice, translated voice, host monitoring), and most failures come from never separating them.

Real-time translation is not one model but four systems in series: segmentation, recognition, translation, synthesis. Any slow stage slows everything, any wrong stage corrupts everything after it, so measuring the bottleneck always comes first.

The hard part of cross-border live streaming is not translation but the fact that the same script stops working once the language and culture change. Picking the right language pair, time slot and local phrasing beats two more points of accuracy.

There is no single best live translation setup, only one that fits a specific language pair, budget and latency tolerance. Every comparison here states its test conditions instead of publishing a ranking with no premises.