Seraphimon956 wrote: ↑Fri Jan 13, 2023 10:38 pm
I have discovered another strange bug (?). Apparently, when one plays the .m2ts created with tsmuxer, with Dolby vision FEL content (profile 7 double layer), my LG cx does show the label for atmos and dolby vision, but the player itself says that the content is 4k/24p HDR. The same does not apply when you play the bdmv at the root of the USB external drive by pressing the avchd virtual folder; in that case both the player and the TV display the Dolby Vision label. But the problem of the downgrade of the Atmos track remains and now I am pretty sure of it since the difference is audible even by reproducing atmos content with the TV internal speakers: the Atmos track is clearer and slightly louder. I hope someone has fresh info on this problem, I literally searched everywhere but nobody seems to have noticed the atmos downgrade bug.
I don't have a CX to know how audio is treated, but you're expecting the CX to pass the TrueHD audio through to an audio device via eARC? What does the device say it's decoding? My understanding is that the CX does not have a TrueHD decoder to play back the audio on the TV. The Atmos support is limited to an EAC3 decoder.
Supported codecs: AC4, AC3 (Dolby Digital),
EAC3, HE-AAC, AAC, MP2, MP3, PCM, WMA, apt-X (refer to manual)
I send my video+audio from the X700 through an AVR to a TV, and the AVR plays and decodes and shows the info for TrueHD Atmos when the audio stream is properly muxed with an AC3 core. If you're taking your audio stream from the UHD BD as you say, then you should already have the AC3 core in your audio stream when you remux to BDMV. If you're going through some other intermediate step, you need to first remux your TrueHD stream with an AC3 core before remuxing the DTDL HEVC files and thd+ac3 file to BDMV.
The X700 won't play DV7 from m2ts in my experience, you have to use a BDMV folder from USB. The X700 is reporting HDR instead of DV because it isn't applying DV, it's just playing back the HDR10 BL.
So for m2ts, you'd have to convert DV7 FEL to DV8.1 and lose the benefit of the full EL.
For DV7 MEL/FEL, I use BDMV format for the best playback experience and max quality, and I get TrueHD Atmos audio.
For DV8, I use m2ts format streamed from network or USB and can also get TrueHD Atmos audio.