: Go to Settings > Audio and change the output from "Auto" or "Surround" to Stereo .
In the rush to localize the series for a global audience, many encoding groups prioritized file size over audio integrity. To fit the massive file sizes of high-definition video onto standard storage, they compressed the audio tracks using codecs like AAC (Advanced Audio Coding) or MP3.
: This free tool allows you to "remux" the file. You can uncheck the audio track you don't want and save a new version of the episode that only contains your preferred language. To those with sound issues :: Game of Thrones
Audacity + FFmpeg plugin.