Another codec tip: if you're encoding with opus, especially with libopus, at low-mid bitrates (96k or so, the default), use --no-phase-inv (apply_phase_inv=0 in ffmpeg libopusenc).
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The thing is a stereo mix is *consistent* in its mono compatibility. Some instruments will be louder or quieter in the mono downmix, but it's always the same. Good mixes will engineer with this in mind to keep things sounding good and balanced in mono.
Bad mixes won't, but at least they'll be consistent. So the balance may be out of whack, and then it sounds like a bad mix, but still "normal". However, the encoder messes with this property on whole frequency bands, and turns it on and off in time as it sees fit.
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So it doesn't sound like a good or a bad mix, it sounds like a madman is turning low-pass or band-cut filters on and off randomly.
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At 96k bitrates/20ms frames, it only affects the 12kHz and onwards band, so it sounds like your audio quality is going down from 48kHz to 24kHz randomly. At lower bitrates, or lower frame sizes due to that bug I found, it affects more bands and ends up sounding like a bad MP3.
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