Audio
How to fix echo on a live stream without changing everything
Tell room echo, playback loops and duplicate microphone capture apart, then remove the extra audio path causing the problem.
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Fix a problem
Find the cause of silent sound, echo and interrupted video, one useful check at a time.
Audio
Live stream has no sound? Find where the audio stops
Check viewer playback, microphone permissions, device selection, OBS meters and output tracks in a sensible order.