I see from @RESET_9999 's Playback-Devices C9 should support FEL mp4 and lossy audio.
If you want to do it manually, for example for the
'Game.of.Thrones.S01.2160p.BluRay.REMUX.HEVC.DTS-HD.MA.TrueHD.7.1.Atmos-FGT'
You could try:
1. Extract bl.hevc, el.hevc, audio.ac3
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ffmpeg -i remux.mkv -map 0:0 -c copy bl.hevc -map 0:1 -c copy el.hevc -map 0:4 -c copy audio.ac3
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mp4muxer -i bl.hevc -i el.hevc -i audio.ac3 -o dual_track_fel.mp4
2. Generate single track BL_EL_RPU.hevc by dovi_tool (yusesope's tool is a little complicated)
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dovi_tool mux --bl bl.hevc --el el.hevc
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mp4muxer -i BL_EL_RPU.hevc -i audio.ac3 -o single_track_fel.mp4
If both @RESET_9999 's script and above fail, it may because the file is corrupted.
Edit: Oh I see you have already found the problem, cheers.