So I've encoded an raw DTS 5.1 stream with ffmpeg to OPUS ffmpeg -i test.mkv -map 0:1 -acodec libopus -b:a 384k -mapping_family 255 testout.mkv Now MPV will playback the Audio just fine, but VLC as of 3.0.12 won't. I'm on Windows 10 if that matters, although it should not. It shows opus correctly in...