These are some example files from Dolby: https://ott.dolby.com/OnDelKits/DDP/Dolby_Digital_Plus_Online_Delivery_Kit_v1.4.1/Test_Signals/muxed_streams/MPEG2TS/MPEG2TS_Muxed_Streams.html
Thesr contain 5.1 audio. Playing it on my stereo gear (I only have two ears anyway), I would expect the players (mplayer, ffplay, mpv, vlc) to do the reasonable thing: figure out the "right" position in the stereo panorama and play it "there". But it seems only mplayer does that - for example, all the other players play the "center" channel on the left. If anyone cares about this, can you plese confirm/report what the various players do with this on your stereo hardware? Thanks Jan