I recently installed BlueStacks Android emulator on my Win 10 PC.
I then installed Catmouse.
TV shows play well, both audio and video.
However, when playing a movie, video played well but audio would not play when using MX Player as default player.
I reverted to default Catmouse player, Exo player, and audio plays great.
I hope you find this tip helpful.
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I use vlc for my player. If you are using the Firestick 4k, disable hardware acceleration.