OK, so let's be methodical. One issue at a time. It would appear that you've understood the audio passthrough / not playing issue. So let's look at whatever the other issue is... which isn't clearly defined nor understood. First, try replacing the mpv library (there have been issues with that).  Go to: C:\Users\YOURNAME\AppData\Roaming\Emby-Theater\electronapp\libmpv\x64 Replace mpv-1.dll by downloading and extracting this file, Then renaming libmpv-2.dll to mpv-1.dll In the