Dolby Vision now possible through MP4 Mux.

[RESET_9999]

P7 is always dual layers.

Single track Dual layer means that the BL + EL are interleaved which is what MakeMKV does
Dual track Dual layer is the Bluray original format.

[sofakng]

Got. Thanks for the explanation!

[LV8HD]

Hi everyone, some time ago I asked if anybody here knew how to change maxcll and maxfall values within the hevc stream itslef without the need to re-encode it. Well ,I've finally figured it out.
Thus, a question comes to my mind: how important are these values in the actual playblack? I've seen many movies having those values wrong and sometimes not having them at all.

They don't matter for DV playback for sure, and possibly not in some contexts even for HDR fallback, as Paramount for example continues to not add MDL metadata for their UHD BDs. Curious what the method you figured out is, regardless, please share if you're willing to. Thank you kindly. Cheers.

The process is fairly simple and intuitive, you only have to get used to working with hex code editors in order to identify the proper segments to change.
Here's an example:

Let's say I want to change MDL and MaxCLL and MaxFALL values of this hevc stream:

Code: Select all

Video
Format                                   : HEVC
Format/Info                              : High Efficiency Video Coding
Format profile                           : Main 10@L5@Main
HDR format                               : SMPTE ST 2094 App 4, Version 1, HDR10+ Profile B compatible
Width                                    : 3 840 pixels
Height                                   : 1 600 pixels
Display aspect ratio                     : 2.40:1
Frame rate                               : 23.976 (24000/1001) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 10 bits
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: 0.0001 cd/m2, max: 1000 cd/m2
Maximum Content Light Level              : 763 cd/m2
Maximum Frame-Average Light Level        : 218 cd/m2

The new values are going to be:
MDL: 4000
MaxCLL: 1653
MaxFALL: 614

1) Open up your file with https://github.com/virinext/hevcesbrowser
MDL, MaxCLL and MaxFALL values are stored as SEI NALs within the hevc stream and that's what we are looking for.
For every SEI keep in mind its position and lenght, we will need those values later in the editor.

MaxCLL and MaxFALL:


MDL:




2) Now that we have identified MDL, MaxCLL and MaxFALL positions we can open up the stream with a Hex Editor. I'll be using https://freehexeditorneo.com/ but it's just a matter of personal preference.

We will first change the MDL: go to Select -> Select Range. Swap from Hexadecimal to decimal. Now, 122 is the offset and 33 is its size.



These lines of code contain the MDL values somewhere. To actually understand where and what to change whe first have to convert the decimal value for the max_display_mastering_luminance to hexadecimal using a converter https://www.rapidtables.com/convert/num ... o-hex.html. 10000000 is the decimal value and 00989680 is the hexadecimal value we have to identify and swap.



The Hexadecimal value for 40000000 is 02625A00: this is what we have to swap 00989680 for.




Changing MaxCLL and MaxFALL works the same.

When you're finished just save as .hevc and you're done.

New file:

Code: Select all

Video
Format                                   : HEVC
Format/Info                              : High Efficiency Video Coding
Format profile                           : Main 10@L5@Main
HDR format                               : SMPTE ST 2094 App 4, Version 1, HDR10+ Profile B compatible
Width                                    : 3 840 pixels
Height                                   : 1 600 pixels
Display aspect ratio                     : 2.40:1
Frame rate                               : 23.976 (24000/1001) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 10 bits
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: 0.0001 cd/m2, max: 4000 cd/m2
Maximum Content Light Level              : 1653 cd/m2
Maximum Frame-Average Light Level        : 614 cd/m2

EDIT:

When muxed to MKV mediainfo shows this error:

Code: Select all

Video
ID                                       : 1
Format                                   : HEVC
Format/Info                              : High Efficiency Video Coding
Format profile                           : Main 10@L5@Main
HDR format                               : Dolby Vision, Version 1.0, Profile 8.1, dvhe.08.06, BL+RPU, no metadata compression, HDR10 compatible / SMPTE ST 2094 App 4, Version HDR10+ Profile B, HDR10+ Profile B compatible
Codec ID                                 : V_MPEGH/ISO/HEVC
Duration                                 : 5 min 0 s
Bit rate                                 : 13.7 Mb/s
Width                                    : 3 840 pixels
Height                                   : 1 600 pixels
Display aspect ratio                     : 2.40:1
Frame rate mode                          : Constant
Frame rate                               : 23.976 (24000/1001) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 10 bits
Bits/(Pixel*Frame)                       : 0.093
Stream size                              : 489 MiB (100%)
Default                                  : Yes
Forced                                   : No
Color range                              : Limited
Color primaries                          : BT.2020
Transfer characteristics                 : PQ
Matrix coefficients                      : BT.2020 non-constant
Mastering display color primaries        : R: x=0.129280 y=0.005360, G: x=0.000060 y=0.358420, B: x=0.081920 y=0.000000, White point: x=0.010220 y=1.305640
Mastering display luminance              : min: 0.0000 cd/m2, max: 53687 cd/m2
Maximum Content Light Level              : 1653 cd/m2
Maximum Frame-Average Light Level        : 614 cd/m2
SEI_rbsp_stop_one_bit                    : Missing
Conformance errors                       : 1
 HEVC                                    : Yes
  General compliance                     : Bitstream parsing ran out of data to read before the end of the syntax was reached, most probably the bitstream is malformed (frame 0, time 00:00:00.000, offset 0x1D86)

I don't know what went wrong. i guess it only works for MaxCLL and MaxFALL values

[skull88]

Wow, so it does involve hex editing, that's what I was curious about, or if someone developed some tool open source or something. I really appreciate the detailed explanation sir. Thanks LV8HD. <3

[Rororororo]

@RESET_9999

Where'd you get CMv4.0 bloc for Batman 2022?
I've got P5 and P8 WEBs, both of which are 2.9 blocs and only two 4.0 shots with no L3L8L9 metadata

[RESET_9999]

MAX web-dl