Dolby Vision now possible through MP4 Mux.

[RESET_9999]

Has anyone else noticed subtle lip sync issues playing dual layer DV MP4s (with LPCM) on the X700?

I’ve noticed it a few times now when starting playing different files. Although it seems to perhaps correct itself after a bit.

Comparatively, discs always seem to have spot on lip sync.

oh yeah, I do experience that audio delay with x700. I think I tried the Deer Hunter, was way out of sync, maybe by 800ms. Played the mp4 on PC, in sync, on x700, out of sync. Not every title is out of sync, and not every out of sync title is off by the same duration. It's this random nature that drew me off. I think I'll jump over to projectors sooner or later, get a Penny ub820 and forget about having to deal with DV at all. lol.

800ms out of sync.. wow i never ever had this issue....
I noticed in some rare occasions a small 100-200ms delay and i just pause/resume the video and it go back in sync.

x700---> denon AVR---> C8

[RESET_9999]

So... every file I've tried creating so far with tsMuxeR is corrupt (whether I play on a computer in VLC or in the X700).

Googling there seems to be a known issue that when using tsMuxeR with hevc, frames can be skipped leading to these sorts of issues. I'm having a hard time figuring out if the fix for this has been made public yet and which version to download. It seems there are some forks of tsMuxeR with more up to date fixes.

I wonder if anybody could help with advice on which version of tsMuxeR to install that should be ok with UHD mkvs?

Thanks.

sounds like you are using the very old not open source version of tsmuxer which did not support uhd-bd properly

this version is the right one: 2020-02-23--01-10-39.zip
https://bintray.com/justdan96/tsMuxer/t ... htly#files

[baker99]

DL seems fine, I always have lip sync issues with the x700 and my Denon avr, the ts doesn't seem any worse than other files for this.

SL works and plays with DV, I can't get Atmos to work on the shield in SL though, but that could be me doing something wrong, mediainfo says there's an Atmos track, plex on the shield just doesn't see it.

Edit: Atmos works fine on SL DV ts on the X700, so looks like plex or the shield being funny

Code: Select all

General
ID                                       : 1 (0x1)
Complete name                            : G:\Dolby Vision SL\DV.SL.ts
Format                                   : MPEG-TS
File size                                : 80.4 GiB
Duration                                 : 2 h 11 min
Overall bit rate mode                    : Variable
Overall bit rate                         : 87.4 Mb/s
Maximum Overall bit rate                 : 35.5 Mb/s

Video
ID                                       : 4117 (0x1015)
Menu ID                                  : 1 (0x1)
Format                                   : HEVC
Format/Info                              : High Efficiency Video Coding
Commercial name                          : HDR10
Format profile                           : Main 10@L5.1@High
Dolby Vision                             : 1.0, dvhe.08.06, BL+RPU
Codec ID                                 : 36
Duration                                 : 2 h 11 min
Bit rate                                 : 79.4 Mb/s
Width                                    : 3 840 pixels
Height                                   : 2 160 pixels
Display aspect ratio                     : 16:9
Frame rate                               : 23.976 (24000/1001) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0 (Type 2)
Bit depth                                : 10 bits
Bits/(Pixel*Frame)                       : 0.399
Stream size                              : 73.0 GiB (91%)
Color range                              : Limited
Color primaries                          : BT.2020
Transfer characteristics                 : PQ
Matrix coefficients                      : BT.2020 non-constant
Mastering display color primaries        : Display P3
Mastering display luminance              : min: 0.0050 cd/m2, max: 4000 cd/m2
Maximum Content Light Level              : 1351 cd/m2
Maximum Frame-Average Light Level        : 384 cd/m2

Audio #1
ID                                       : 4352 (0x1100)
Menu ID                                  : 1 (0x1)
Format                                   : AC-3 MLP FBA 16-ch
Format/Info                              : Audio Coding 3 + Meridian Lossless Packing FBA with 16-channel presentation
Commercial name                          : Dolby TrueHD with Dolby Atmos
Muxing mode                              : Stream extension
Codec ID                                 : 131
Duration                                 : 2 h 11 min
Bit rate mode                            : Variable
Bit rate                                 : 448 kb/s
Maximum bit rate                         : 5 931 kb/s
Channel(s)                               : 8 channels
Channel layout                           : L R C LFE Ls Rs Lb Rb
Sampling rate                            : 48.0 kHz
Frame rate                               : 31.250 FPS (1536 SPF)
Bit depth                                : 16 bits
Compression mode                         : Lossy
Stream size                              : 422 MiB (1%)
Language                                 : English
Service kind                             : Complete Main
Number of dynamic objects                : 15
Bed channel count                        : 1 channel
Bed channel configuration                : LFE

Audio #2
ID                                       : 4353 (0x1101)
Menu ID                                  : 1 (0x1)
Format                                   : AC-3
Format/Info                              : Audio Coding 3
Commercial name                          : Dolby Digital
Codec ID                                 : 129
Duration                                 : 2 h 11 min
Bit rate mode                            : Constant
Bit rate                                 : 448 kb/s
Channel(s)                               : 6 channels
Channel layout                           : L R C LFE Ls Rs
Sampling rate                            : 48.0 kHz
Frame rate                               : 31.250 FPS (1536 SPF)
Bit depth                                : 16 bits
Compression mode                         : Lossy
Stream size                              : 422 MiB (1%)
Service kind                             : Complete Main

Audio #3
ID                                       : 4354 (0x1102)
Menu ID                                  : 1 (0x1)
Format                                   : AC-3
Format/Info                              : Audio Coding 3
Commercial name                          : Dolby Digital
Codec ID                                 : 129
Duration                                 : 2 h 11 min
Bit rate mode                            : Constant
Bit rate                                 : 448 kb/s
Channel(s)                               : 6 channels
Channel layout                           : L R C LFE Ls Rs
Sampling rate                            : 48.0 kHz
Frame rate                               : 31.250 FPS (1536 SPF)
Bit depth                                : 16 bits
Compression mode                         : Lossy
Stream size                              : 422 MiB (1%)
Service kind                             : Complete Main

Audio #4
ID                                       : 4355 (0x1103)
Menu ID                                  : 1 (0x1)
Format                                   : AC-3
Format/Info                              : Audio Coding 3
Commercial name                          : Dolby Digital
Codec ID                                 : 129
Duration                                 : 2 h 11 min
Bit rate mode                            : Constant
Bit rate                                 : 448 kb/s
Channel(s)                               : 6 channels
Channel layout                           : L R C LFE Ls Rs
Sampling rate                            : 48.0 kHz
Frame rate                               : 31.250 FPS (1536 SPF)
Bit depth                                : 16 bits
Compression mode                         : Lossy
Stream size                              : 422 MiB (1%)
Service kind                             : Complete Main

Audio #5
ID                                       : 4356 (0x1104)
Menu ID                                  : 1 (0x1)
Format                                   : AC-3
Format/Info                              : Audio Coding 3
Commercial name                          : Dolby Digital
Codec ID                                 : 129
Duration                                 : 2 h 11 min
Bit rate mode                            : Constant
Bit rate                                 : 448 kb/s
Channel(s)                               : 6 channels
Channel layout                           : L R C LFE Ls Rs
Sampling rate                            : 48.0 kHz
Frame rate                               : 31.250 FPS (1536 SPF)
Bit depth                                : 16 bits
Compression mode                         : Lossy
Stream size                              : 422 MiB (1%)
Service kind                             : Complete Main

Audio #6
ID                                       : 4357 (0x1105)
Menu ID                                  : 1 (0x1)
Format                                   : AC-3
Format/Info                              : Audio Coding 3
Commercial name                          : Dolby Digital
Codec ID                                 : 129
Duration                                 : 2 h 11 min
Bit rate mode                            : Constant
Bit rate                                 : 448 kb/s
Channel(s)                               : 6 channels
Channel layout                           : L R C LFE Ls Rs
Sampling rate                            : 48.0 kHz
Frame rate                               : 31.250 FPS (1536 SPF)
Bit depth                                : 16 bits
Compression mode                         : Lossy
Stream size                              : 422 MiB (1%)
Service kind                             : Complete Main

Audio #7
ID                                       : 4358 (0x1106)
Menu ID                                  : 1 (0x1)
Format                                   : AC-3
Format/Info                              : Audio Coding 3
Commercial name                          : Dolby Digital
Codec ID                                 : 129
Duration                                 : 2 h 11 min
Bit rate mode                            : Constant
Bit rate                                 : 448 kb/s
Channel(s)                               : 6 channels
Channel layout                           : L R C LFE Ls Rs
Sampling rate                            : 48.0 kHz
Frame rate                               : 31.250 FPS (1536 SPF)
Bit depth                                : 16 bits
Compression mode                         : Lossy
Stream size                              : 422 MiB (1%)
Service kind                             : Complete Main

Audio #8
ID                                       : 4359 (0x1107)
Menu ID                                  : 1 (0x1)
Format                                   : AC-3
Format/Info                              : Audio Coding 3
Commercial name                          : Dolby Digital
Codec ID                                 : 129
Duration                                 : 2 h 11 min
Bit rate mode                            : Constant
Bit rate                                 : 448 kb/s
Channel(s)                               : 6 channels
Channel layout                           : L R C LFE Ls Rs
Sampling rate                            : 48.0 kHz
Frame rate                               : 31.250 FPS (1536 SPF)
Bit depth                                : 16 bits
Compression mode                         : Lossy
Stream size                              : 422 MiB (1%)
Service kind                             : Complete Main

Text #1
ID                                       : 4768 (0x12A0)
Menu ID                                  : 1 (0x1)
Format                                   : PGS
Codec ID                                 : 144
Delay relative to video                  : 2 s 544 ms

Text #2
ID                                       : 4770 (0x12A2)
Menu ID                                  : 1 (0x1)
Format                                   : PGS
Codec ID                                 : 144
Delay relative to video                  : 2 s 544 ms

[superfans124]

Has anyone else noticed subtle lip sync issues playing dual layer DV MP4s (with LPCM) on the X700?

I’ve noticed it a few times now when starting playing different files. Although it seems to perhaps correct itself after a bit.

Comparatively, discs always seem to have spot on lip sync.

oh yeah, I do experience that audio delay with x700. I think I tried the Deer Hunter, was way out of sync, maybe by 800ms. Played the mp4 on PC, in sync, on x700, out of sync. Not every title is out of sync, and not every out of sync title is off by the same duration. It's this random nature that drew me off. I think I'll jump over to projectors sooner or later, get a Penny ub820 and forget about having to deal with DV at all. lol.

800ms out of sync.. wow i never ever had this issue....
I noticed in some rare occasions a small 100-200ms delay and i just pause/resume the video and it go back in sync.

x700---> denon AVR---> C8

almost the same: x700 > Denon x4300h > C6

my mp4 was done with the mp4box, because I remember I had to search for command lines to adjust for the audio sync issues, way too tedious work to find whether it was 800ms or 600ms delay in the TV end, you can imagine. So I just stopped bothering. Even the ones muxed with DVDfab give me slight delay, but no pause/resume would fix it on my end, it's consistently out of sync throughout.

[Grencola]

Code: Select all

Audio #1
ID                                       : 4352 (0x1100)
Menu ID                                  : 1 (0x1)
[b]Format                                   : AC-3[/b] MLP FBA 16-ch
Format/Info                              : Audio Coding 3 + Meridian Lossless Packing FBA with 16-channel presentation
Commercial name                          : Dolby TrueHD with Dolby Atmos
Muxing mode                              : Stream extension
Codec ID                                 : 131
Duration                                 : 2 h 11 min
Bit rate mode                            : Variable
[b]Bit rate                                 : 448 kb/s[/b]
Maximum bit rate                         : 5 931 kb/s
Channel(s)                               : 8 channels
Channel layout                           : L R C LFE Ls Rs Lb Rb
Sampling rate                            : 48.0 kHz
Frame rate                               : 31.250 FPS (1536 SPF)
Bit depth                                : 16 bits
[b]Compression mode                         : Lossy
Stream size                              : 422 MiB (1%)[/b]
Language                                 : English
Service kind                             : Complete Main
Number of dynamic objects                : 15
Bed channel count                        : 1 channel
Bed channel configuration                : LFE

Audio #2
ID                                       : 4353 (0x1101)
Menu ID                                  : 1 (0x1)
[b]Format                                   : AC-3[/b]
Format/Info                              : Audio Coding 3
Commercial name                          : Dolby Digital
Codec ID                                 : 129
Duration                                 : 2 h 11 min
Bit rate mode                            : Constant
[b]Bit rate                                 : 448 kb/s[/b]
Channel(s)                               : 6 channels
Channel layout                           : L R C LFE Ls Rs
Sampling rate                            : 48.0 kHz
Frame rate                               : 31.250 FPS (1536 SPF)
Bit depth                                : 16 bits
[b]Compression mode                         : Lossy
Stream size                              : 422 MiB (1%)[/b]
Service kind                             : Complete Main

sigh.. once again that does NOT appear to be real truehd atmos. not even dd+ eac3 atmos. I'm not sure why that's on a uhd disc, the other 99% of them are full high-bitrate lossless atmos. it's possible the shield is having an issue with this sorry excuse for atmos.

a better test for the shield would be to try a title with full lossless thd atmos and uncheck all others in TSMuxer so that it's the only audio track the ts has.

there should be no mention of ac-3 in real atmos, only true-hd, like this:

Code: Select all

Audio #1
ID : 2
Format : MLP FBA 16-ch
Format/Info : Meridian Lossless Packing FBA with 16-channel presentation
Commercial name : Dolby TrueHD with Dolby Atmos
Codec ID : A_TRUEHD
Duration : 1 h 43 min
Bit rate mode : Variable
Bit rate : 8 449 kb/s
Maximum bit rate : 10.6 Mb/s
Channel(s) : 8 channels
Channel layout : L R C LFE Ls Rs Lb Rb
Sampling rate : 48.0 kHz
Frame rate : 1 200.000 FPS (40 SPF)
Compression mode : Lossless
Stream size : 6.09 GiB (11%)
Language : English
Default : Yes
Forced : No
Number of dynamic objects : 13
Bed channel count : 1 channel
Bed channel configuration : LFE

[baker99]

Code: Select all

Audio #1
ID                                       : 4352 (0x1100)
Menu ID                                  : 1 (0x1)
[b]Format                                   : AC-3[/b] MLP FBA 16-ch
Format/Info                              : Audio Coding 3 + Meridian Lossless Packing FBA with 16-channel presentation
Commercial name                          : Dolby TrueHD with Dolby Atmos
Muxing mode                              : Stream extension
Codec ID                                 : 131
Duration                                 : 2 h 11 min
Bit rate mode                            : Variable
[b]Bit rate                                 : 448 kb/s[/b]
Maximum bit rate                         : 5 931 kb/s
Channel(s)                               : 8 channels
Channel layout                           : L R C LFE Ls Rs Lb Rb
Sampling rate                            : 48.0 kHz
Frame rate                               : 31.250 FPS (1536 SPF)
Bit depth                                : 16 bits
[b]Compression mode                         : Lossy
Stream size                              : 422 MiB (1%)[/b]
Language                                 : English
Service kind                             : Complete Main
Number of dynamic objects                : 15
Bed channel count                        : 1 channel
Bed channel configuration                : LFE

Audio #2
ID                                       : 4353 (0x1101)
Menu ID                                  : 1 (0x1)
[b]Format                                   : AC-3[/b]
Format/Info                              : Audio Coding 3
Commercial name                          : Dolby Digital
Codec ID                                 : 129
Duration                                 : 2 h 11 min
Bit rate mode                            : Constant
[b]Bit rate                                 : 448 kb/s[/b]
Channel(s)                               : 6 channels
Channel layout                           : L R C LFE Ls Rs
Sampling rate                            : 48.0 kHz
Frame rate                               : 31.250 FPS (1536 SPF)
Bit depth                                : 16 bits
[b]Compression mode                         : Lossy
Stream size                              : 422 MiB (1%)[/b]
Service kind                             : Complete Main

sigh.. once again that does appear to be real truehd atmos. not even dd+ eac3 atmos. I'm not sure why that's on a uhd disc, the other 99% of them are full high-bitrate lossless atmos. it's possible the shield is having an issue with this sorry excuse for atmos.

a better test for the shield would be to try a title with full lossless thd atmos and uncheck all others in TSMuxer so that it's the only audio track the ts has.

there should be no mention of ac-3 in real atmos, only true-hd, like this:

Code: Select all

Audio #1
ID : 2
Format : MLP FBA 16-ch
Format/Info : Meridian Lossless Packing FBA with 16-channel presentation
Commercial name : Dolby TrueHD with Dolby Atmos
Codec ID : A_TRUEHD
Duration : 1 h 43 min
Bit rate mode : Variable
Bit rate : 8 449 kb/s
Maximum bit rate : 10.6 Mb/s
Channel(s) : 8 channels
Channel layout : L R C LFE Ls Rs Lb Rb
Sampling rate : 48.0 kHz
Frame rate : 1 200.000 FPS (40 SPF)
Compression mode : Lossless
Stream size : 6.09 GiB (11%)
Language : English
Default : Yes
Forced : No
Number of dynamic objects : 13
Bed channel count : 1 channel
Bed channel configuration : LFE

I figured there was something wrong with that track, any tips on how to properly extract the Atmos track from a UHD disc? I have tried a few things so far, for the above what I did was create a DVDFab SL DV mp4, dropped that into tsmuxer, then dropped the original m2ts into tsmuxer, I removed the video tracks the m2ts added leaving only all it's audio tracks and PGS files, then muxe to a ts.

For DL it's so much easier, just drop the m2ts in then mux.

I'm going to try another disc and see what happens.

[built_to_chill]

sounds like you are using the very old not open source version of tsmuxer which did not support uhd-bd properly

this version is the right one: 2020-02-23--01-10-39.zip
https://bintray.com/justdan96/tsMuxer/t ... htly#files

Thank you - I'm now having a lot more success with txmuxer. I've created now some from the eac3to thd+ac3 files and they seem to work fine now. Also some created from DTS-HD tracks play fine too now, so it was just that I was using an old version.

Thanks everyone for replies above r.e. lip sync. For the record my setup is:

X700 -> Sony AF9 -> Denon 3500 AVR (via eARC). But the lip sync issue with LPCM is there also if direct connect to the receiver.

In my experience playing video files with "normal" codecs such as TrueHD/Atmos and DTS-HD/X the X700 is spot on. It is only LPCM and Flac that it is iffy. I actually owned an X700 some time ago - and used it to watch my mkvs in HDR10. This rings a bell now about issues with LPCM (I ended up ripping everything back then as m2ts, to avoid needing to convert audio although I've since converted everything to mkv).

I think I'll keep the X700 rather than return as I was thinking too earlier today. The strides they are taking with tsMuxeR at the moment, perhaps it will soon become possible to create dolby vision and Atmos m2ts files from dual layer DV MP4s, in which case the lip sync issues might be gone and get DV.

Failing that I can consider physically re-ripping all my UHDs given @RESET_9999s observations above - getting DV and Atmos without needing to remux to MP4, but there are quite a lot of discs so I'll hold off for now.

[built_to_chill]

Oh yes I meant to ask - is it possible to transcode a TrueHD track to high bitrate DD+ (i.e. eAC3) and include that inside a dual layer DV MP4? Or does it have to be AC3?

[RESET_9999]

sigh.. once again that does NOT appear to be real truehd atmos. not even dd+ eac3 atmos. I'm not sure why that's on a uhd disc, the other 99% of them are full high-bitrate lossless atmos. it's possible the shield is having an issue with this sorry excuse for atmos.

a better test for the shield would be to try a title with full lossless thd atmos and uncheck all others in TSMuxer so that it's the only audio track the ts has.

there should be no mention of ac-3 in real atmos, only true-hd, like this:

Code: Select all

Audio #1
ID : 2
Format : MLP FBA 16-ch
Format/Info : Meridian Lossless Packing FBA with 16-channel presentation
Commercial name : Dolby TrueHD with Dolby Atmos
Codec ID : A_TRUEHD
Duration : 1 h 43 min
Bit rate mode : Variable
Bit rate : 8 449 kb/s
Maximum bit rate : 10.6 Mb/s
Channel(s) : 8 channels
Channel layout : L R C LFE Ls Rs Lb Rb
Sampling rate : 48.0 kHz
Frame rate : 1 200.000 FPS (40 SPF)
Compression mode : Lossless
Stream size : 6.09 GiB (11%)
Language : English
Default : Yes
Forced : No
Number of dynamic objects : 13
Bed channel count : 1 channel
Bed channel configuration : LFE

i checked a couple of uhd-bd m2ts and they all say lossy ac3 .... that mediainfo you link is probably a TrueHD file without ac3 core from an mkv file.

[baker99]

sigh.. once again that does NOT appear to be real truehd atmos. not even dd+ eac3 atmos. I'm not sure why that's on a uhd disc, the other 99% of them are full high-bitrate lossless atmos. it's possible the shield is having an issue with this sorry excuse for atmos.

a better test for the shield would be to try a title with full lossless thd atmos and uncheck all others in TSMuxer so that it's the only audio track the ts has.

there should be no mention of ac-3 in real atmos, only true-hd, like this:

Code: Select all

Audio #1
ID : 2
Format : MLP FBA 16-ch
Format/Info : Meridian Lossless Packing FBA with 16-channel presentation
Commercial name : Dolby TrueHD with Dolby Atmos
Codec ID : A_TRUEHD
Duration : 1 h 43 min
Bit rate mode : Variable
Bit rate : 8 449 kb/s
Maximum bit rate : 10.6 Mb/s
Channel(s) : 8 channels
Channel layout : L R C LFE Ls Rs Lb Rb
Sampling rate : 48.0 kHz
Frame rate : 1 200.000 FPS (40 SPF)
Compression mode : Lossless
Stream size : 6.09 GiB (11%)
Language : English
Default : Yes
Forced : No
Number of dynamic objects : 13
Bed channel count : 1 channel
Bed channel configuration : LFE

i checked a couple of uhd-bd m2ts and they all say lossy ac3 .... that mediainfo you link is probably a TrueHD file without core from an mkv file.

I just went through a few too, all say ac3 too. I'm now attempting to use eac3to to make thd+ac3 for tsmuxer, hopefully that will work with the shield...

[RESET_9999]

Oh yes I meant to ask - is it possible to transcode a TrueHD track to high bitrate DD+ (i.e. eAC3) and include that inside a dual layer DV MP4? Or does it have to be AC3?

https://xrecode.com/

[RESET_9999]

oh yeah, I do experience that audio delay with x700. I think I tried the Deer Hunter, was way out of sync, maybe by 800ms. Played the mp4 on PC, in sync, on x700, out of sync. Not every title is out of sync, and not every out of sync title is off by the same duration. It's this random nature that drew me off. I think I'll jump over to projectors sooner or later, get a Penny ub820 and forget about having to deal with DV at all. lol.

800ms out of sync.. wow i never ever had this issue....
I noticed in some rare occasions a small 100-200ms delay and i just pause/resume the video and it go back in sync.

x700---> denon AVR---> C8

almost the same: x700 > Denon x4300h > C6

my mp4 was done with the mp4box, because I remember I had to search for command lines to adjust for the audio sync issues, way too tedious work to find whether it was 800ms or 600ms delay in the TV end, you can imagine. So I just stopped bothering. Even the ones muxed with DVDfab give me slight delay, but no pause/resume would fix it on my end, it's consistently out of sync throughout.

I'll try Deer Hunter but there's a 3000MS delay on the uhd-BD, so that might explain your issue with that title.

Code: Select all

Audio #1
ID : 3
Format : DTS
Format/Info : Digital Theater Systems
Format profile : MA / Core
Codec ID : A_DTS
Duration : 3 h 3 min
Bit rate mode : Variable / Constant
Bit rate : 2 949 kb/s / 1 509 kb/s
Channel(s) : 6 channels
Channel positions : Front: L C R, Side: L R, LFE
Sampling rate : 48.0 kHz
Frame rate : 93.750 FPS (512 SPF)
Bit depth : 24 bits
Compression mode : Lossless / Lossy
Delay relative to video : 3 s 0 ms
Stream size : 3.78 GiB (5%)
Language : English
Default : Yes
Forced : No

[Grencola]

i checked a couple of uhd-bd m2ts and they all say lossy ac3 .... that mediainfo you link is probably a TrueHD file without ac3 core from an mkv file.

It's definitely an m2ts from a uhd disc and not mkv, but I guess the ones I have are lossless, shrug..

[RESET_9999]

i checked a couple of uhd-bd m2ts and they all say lossy ac3 .... that mediainfo you link is probably a TrueHD file without ac3 core from an mkv file.

It's definitely an m2ts from a uhd disc and not mkv, but I guess the ones I have are lossless, shrug..

or maybe you are using an older version of mediainfo.. which movie is it ?

[built_to_chill]

Oh yes I meant to ask - is it possible to transcode a TrueHD track to high bitrate DD+ (i.e. eAC3) and include that inside a dual layer DV MP4? Or does it have to be AC3?

https://xrecode.com/

I’ve just realised you can include a e-AC3 track when creating the dual layer MP4 using Dolby’s mp4base.

I thought it’s quite easy to convert a TrueHD track to e-AC3 using ffmpeg. Curious why you suggested xrecode? It seems pay for software so I guess it brings something to the table.