Audio Bits Sample Issue

[spl147]

im my skin i am using $INFO[Player.Process(AudioBitsPerSample)] to pull bit depth.

the issue is on the Vero4K+ it displays 8 bit and on windows it displays 32 bit (both running KODI 18.5

Mediainfo for the file in question:

General
Unique ID                                : 188553958123456366439744624941960539377 (0x8DDA2BE1699290D7FD589EE899B02CF1)
Complete name                            : /Volumes/Video/Movies/Angel Has Fallen (2019)-2160p/Angel Has Fallen (2019)_Atmos.UHD Blu-ray.HDR10.mkv
Format                                   : Matroska
Format version                           : Version 2
File size                                : 59.1 GiB
Duration                                 : 2h 1mn
Overall bit rate mode                    : Variable
Overall bit rate                         : 69.9 Mbps
Movie name                               : Angel Has Fallen
Encoded date                             : UTC 2019-11-17 23:25:50
Writing application                      : MakeMKV v1.14.5 linux(x64-release)
Writing library                          : libmakemkv v1.14.5 (1.3.5/1.4.7) x86_64-linux-gnu

Video
ID                                       : 1
ID in the original source medium         : 4113 (0x1011)
Format                                   : HEVC
Format/Info                              : High Efficiency Video Coding
Format profile                           : Main 10@L5.1@High
HDR format                               : SMPTE ST 2086, HDR10 compatible
Codec ID                                 : V_MPEGH/ISO/HEVC
Duration                                 : 2h 1mn
Bit rate                                 : 66.8 Mbps
Width                                    : 3 840 pixels
Height                                   : 2 160 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 23.976 (24000/1001) fps
Color space                              : YUV
Chroma subsampling                       : 4:2:0 (Type 2)
Bit depth                                : 10 bits
Bits/(Pixel*Frame)                       : 0.336
Stream size                              : 56.5 GiB (96%)
Language                                 : English
Default                                  : No
Forced                                   : No
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: 0.0010 cd/m2, max: 1000 cd/m2
Maximum Content Light Level              : 1000 cd/m2
Maximum Frame-Average Light Level        : 634 cd/m2
Original source medium                   : Blu-ray

Audio
ID                                       : 2
ID in the original source medium         : 4352 (0x1100)
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                                 : 2h 1mn
Bit rate mode                            : Variable
Bit rate                                 : 3 046 Kbps
Maximum bit rate                         : 5 010 Kbps
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)
Bit depth                                : 24 bits
Compression mode                         : Lossless
Stream size                              : 2.58 GiB (4%)
Title                                    : Surround 7.1
Language                                 : English
Default                                  : Yes
Forced                                   : No
Original source medium                   : Blu-ray
Number of dynamic objects                : 11
Bed channel count                        : 1 channel
Bed channel configuration                : LFE

Menu
00:00:00.000                             : en:Chapter 01
00:06:48.616                             : en:Chapter 02
00:15:07.948                             : en:Chapter 03
00:23:13.767                             : en:Chapter 04
00:28:35.380                             : en:Chapter 05
00:39:39.627                             : en:Chapter 06
00:45:33.439                             : en:Chapter 07
00:50:56.053                             : en:Chapter 08
00:59:23.017                             : en:Chapter 09
01:06:50.715                             : en:Chapter 10
01:16:25.581                             : en:Chapter 11
01:24:10.879                             : en:Chapter 12
01:30:14.409                             : en:Chapter 13
01:37:42.064                             : en:Chapter 14
01:44:54.454                             : en:Chapter 15
01:51:08.119                             : en:Chapter 16

[Chillbo]

Sound quality

That would be tricky to do, because when passthrough is enabled, the audio isn’t being decoded, so there is no way to know how many bits are actually in the audio stream. Kodi only tracks the name of the codec and the number of channels in the database. The information seen “RAW 8bits” refers to the fact that the only processing being done is to send the raw audio stream across HDMI or Toslink 8 bits at a time.

[spl147]

so why does kodi on windows report 32 bit?

[fzinken]

@spl147

so why does kodi on windows report 32 bit?

Do you use Passthrough on Windows?

[spl147]

i looked after posting, i do not

[JimKnopf]

Afaik there is no Dolby TrueHD 32 bit, max. is 24 bit, isn’t it? So whatever is displayed on Windows, it must have another meaning, etc.

[Chillbo]

The answer is quite simple and I’m sure you’d have found out over at the Kodi forum as well: The infolabel is not outputting the file’s bit depth, but rather the bit depth the sink is working at - which is 8bit for passthrough on Vero and 32bit for PCM. This is also the standard on other platforms with the exception that Windows seems to handle passthrough with the sink set to 32bit as well - probably just a different way of processing audio than under Linux.
This is also the reason why I’ve never included this infolabel into the OSMC skin. It depends on the platform used whether the returned information is useful at all. And in most cases it’s not, so no point in using it.

But again: please refer to the Kodi forum’s skinning help section for questions which are related to the Kodi skin engine - which this one and the other one you’ve recently posted on our forum clearly are. Over at the Kodi forum, there’re not just more resources available to help, but possible bugs will automatically get to the right devs for consideration.