It's an old bug, even if BSPlayer's team don't recognize it as a bug. I use 3 different programs to view TV contents on my PC and BSPlayer it's the only one with this behaviour. And muting Window's line in it's not the answer. In BSplayer,s TV window, select for example CD as source. Then you won't have any echo. BUT if you want to capture video, you must swich to line-in.
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