I don't have an answer for you but I too have a lot of issues with ffmpeg when i demux so i avoid it at all cost.
this best and most reliable way IMO is :
-mkvextract for mkv
-tsmuxer for ts/m2ts
-dgdemux for bluray disc
I dont think converting HDR10plus to DV is a good idea and I'm even thinking of removing it from my script. The HDR10plus max_PQ numbers just dont make sense, always much brighter than what DV and HDR10 are.I'm trying to convert the HDR10+ to DV8 with hdr10plus_tool and dovi_tool.
example: https://slow.pics/c/a3EFaZTC
there are other examples buried in here: https://drive.google.com/drive/u/1/fold ... KFJwFxnDt-
I even tested to generate HDR10plus in resolve and got the same "too bright peak" compared to what the actual content is:
https://slow.pics/c/4v8Qvafz
None of the LG TVs can decode Atmos from TrueHD.
I dont know the behavior on the internal LG player but using the PLEX app, the lossless audio gets converted on the fly to DD+ or opus 7.1 and it breaks DV support in the process.