I’ve got an answer that the Plex app doesn’t do downmixing to stereo:
but with these steps now I have direct play with center sounds(I am not sure if it is stereo downmixed)
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Set audio on Android TV to Surround Sound: Never and Digital sounds: PCM and Dolby Sounds: RF
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Set audio on Android TV to Surround Sound: Always and Digital sounds: HDMI
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Set audio on Android TV to Surround Sound: Always and Digital sounds: SPDIF
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Play something on Plex (result: direct play, voice is heard, downmixing to stereo?)
It must be an Android TV problem (I don’t have official Android TV) . If I restart the TV box I have to restart the process but if I unplug it from power and then plug back in then it works with direct play right away…