GOM Media Player
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Full user review
"Issues with sound playing MKV (HD) files"
Plays any file I throw at it. Minimalist interface.
Sound goes off after a while when playing HD (MKV to be precise) files. I have to close and restart my movie every 15 minutes after the onset of the sound issue. Pop up after I close it (since latest update) is annoying.
Good player overall but the cons made start looking for a new default player.