AC-3 (Dolby Digital) codec no longer included with Windows 11 version 24H2



 Microsoft Support:

AC-3 is an audio codec that supports multi-channel (“surround sound”) audio. It's also known as Dolby Digital.

On versions of Windows prior to Windows 11, version 24H2, the AC-3 codec is included.

Beginning with Windows 11, version 24H2, the AC-3 codec is no longer included with Windows. However, many device manufacturers will pre-install an AC-3 codec. Also, if you upgrade to Windows 11, version 24H2 from an earlier version of Windows, the AC-3 codec will be retained. In these cases, you will still be able to play files encoded with the AC-3 audio codec.


 Source:

Codecs in Media Player - Microsoft Support

Codecs allow you to play different formats of audio and video files. Media Player supports a wide variety of codecs. Most are included out of the box; some additional codecs can be installed from the Microsoft Store.
support.microsoft.com support.microsoft.com
 
Click to expand...
uncyler825 said:
I haven't used Dolby AC-3/AC-4 Installer - MajorGeeks.

Windows 11 23H2 Build 22631 or earlier already contains native Dolby Digital supports. Basically, just install the AC-3 files from the previous version onto the 24H2.
Click to expand...
Yes, I am still actually on Beta Insiders 23H2 but just wanted the CODECs on the system regardless. So it seems like AnWave covers AC-3. The MajorGeeks appears to be Windows Store apps which are Microsoft's CODEC's as it's in two appx bundles, one is for Dolby Digital Plus and the other is AC-4 so for the TrueHD, one I guess could use K-Lite CODEC Pack which has both AC-3 and TrueHD.
 

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Just use any ffmpeg based player.
 

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AnWave at GitHub - SimonMacer/AnWave: AnWave Personal Development Project - Manage and customize AMD Radeon drivers and more did seem to have the Dolby AC-3 Codec updated atleast a few times since AnWave had been mentioned originally in this thread.
Current version is 5.82.30.25 but this is from the recent update changes, I am only including the Microsoft Dolby Digital Atmos PAck updated parts.

AnWave 2024 version 5.62.15.30
Updated Microsoft Dolby Digital Atmos Pack to v10.0.22621.4602.

AnWave 2024 version 5.50.11.28
Microsoft Dolby Digital Atmos Pack Updated to 10.0.22621.4460.
 

My Computer

System One

  • OS
    Windows XP/7/8/8.1/10/11, Linux, Android, FreeBSD Unix
    Computer type
    Laptop
    Manufacturer/Model
    Dell XPS 15 9570
    CPU
    Intel® Core™ i7-8750H 8th Gen Processor 2.2Ghz up to 4.1Ghz
    Motherboard
    Dell XPS 15 9570
    Memory
    32GB using 2x16GB modules
    Graphics Card(s)
    Intel UHD 630 & NVIDIA GeForce GTX 1050 Ti with 4GB DDR5
    Sound Card
    Realtek ALC3266-CG
    Monitor(s) Displays
    15.6" 4K Touch UltraHD 3840x2160 made by Sharp
    Screen Resolution
    3840x2160
    Hard Drives
    Toshiba KXG60ZNV1T02 NVMe 1024GB/1TB SSD
    PSU
    Dell XPS 15 9570
    Case
    Dell XPS 15 9570
    Cooling
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    SwitftPoint ProPoint
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uncyler825 said:
Microsoft Dolby Digital Atmos Pack:
You can view these details via dxdiag.exe > Save All Infomation. The AC-3 MFT files from Windows 11 23H2 Build 22631.4317 (Install.wim).
  • Microsoft DSHOW AC3 Decoder,0x005fffff,1,1,msmpeg2ac3dec.dll,10.00.26100.0001
  • Microsoft AC-3 Encoder,0x00200000,1,1,msac3enc.dll,10.00.22621.2506
  • Microsoft Dolby Digital Plus Decoder MFT, {177C0AFE-900B-48D4-9E4C-57ADD250B3D4}, 0x1, DolbyDecMFT.dll, 10.00.22621.4249


Windows Media Player still gave a pop-up saying that the Dolby codec is not there and was silent. It's only need install Microsoft Dolby Audio Extensions. Download: Microsoft.DolbyAudioExtensions_1.0.61521.0_x64__8wekyb3d8bbwe.appx

【HOW-TO】Restore Microsoft Dolby Digital Decoder/Encoder MFT support in Windows 11, version 24H2 · SimonMacer AnWave · Discussion #14
Click to expand...
In the most recent version of AnWave - AnWave 2024 version 5.82.30.25, many files mentioned above as it's newer keeps getting replaced when a sfc /scannow is done as it repairs it for being corrupted, probably because sfc /scannow's database does not know about the newer version due to the checksum mismatch. This is with 24H2 Beta 26120.3360. 26120.3291 does not have the issue. So if I do a sfc /scannow immediately without using AnWave to install the newer versions after the first sfc /scannow, it will not have the problem but if I ran AnWave to install the AC-3 MFT again along with Microsoft.DolbyAudioExtensions_1.0.61521.0_x64__8wekyb3d8bbwe.appx + Download Dolby AC-3/AC-4 Installer - MajorGeek and run a sfc /scannow, it will once again repair the files because it's corrupted.

The following is from the CBS.log:
Code: 
2025-03-02 14:17:35, Info                  CSI    000000b1 Hashes for file member [l:15]'DolbyDecMFT.dll' do not match.
 Expected: {l:32 ml:33 b:9b89194225d8c26feb481f8a9f78cb59ef1a36e00fbad822d44caf92a5b0ec0a}.
 Actual: {l:32 b:b09efc9fc0babd18685248d1b8993ee2d3d0a6c5c2c593ff242e96b997345ec7}.
2025-03-02 14:17:35, Info                  CSI    000000b2 [SR] Repairing file \??\C:\WINDOWS\System32\\DolbyDecMFT.dll from store

2025-03-02 14:18:11, Info                  CSI    00000119 Hashes for file member [l:17]'msmpeg2ac3dec.dll' do not match.
 Expected: {l:32 ml:33 b:43b32b69cd1a6d1a4f95c675a00eff54771a615d89ed93b3a0157633a669c4d2}.
 Actual: {l:32 b:c713a5987f315c8de3379cd51fe48af01572a5ead882256cf49af1a34a204bc6}.
2025-03-02 14:18:11, Info                  CSI    0000011a [SR] Repairing file \??\C:\WINDOWS\System32\\msmpeg2ac3dec.dll from store
2025-03-02 14:18:11, Info                  CSI    0000011b Hashes for file member [l:12]'MSAC3ENC.DLL' do not match.
 Expected: {l:32 ml:33 b:82419ab082252fb9c6e2d0668ce61b874ad4eef50f9cfe5e57baedd6c166f2bf}.
 Actual: {l:32 b:d5f5d9ce36692518ca6212b234ebd808b0f49a64207cb1319c462e944f688e64}.
2025-03-02 14:18:11, Info                  CSI    0000011c [SR] Repairing file \??\C:\WINDOWS\System32\\MSAC3ENC.DLL from store

2025-03-02 14:20:33, Info                  CSI    00000254 Hashes for file member [l:15]'DolbyDecMFT.dll' do not match.
 Expected: {l:32 ml:33 b:6ae48445178ded30298a676da4beae7bee8c72130d826f718cd96a86c96c9892}.
 Actual: {l:32 b:5e104296305cc6b9045fb5c23bfd82368e7b4ff1e4bca6bb5e87f0eee57932b6}.
2025-03-02 14:20:33, Info                  CSI    00000255 [SR] Repairing file \??\C:\WINDOWS\SysWOW64\\DolbyDecMFT.dll from store

2025-03-02 14:21:08, Info                  CSI    000002bf Hashes for file member [l:12]'MSAC3ENC.DLL' do not match.
 Expected: {l:32 ml:33 b:8ed3c1eab827ffa3644861de807c931cb5c79e5cdd1e9f1d43c684b33e7b9806}.
 Actual: {l:32 b:d5824490a1648d73e9b94c806b8fd8ae4827aeeb67da7206f41f704059e4a38d}.
2025-03-02 14:21:08, Info                  CSI    000002c0 [SR] Repairing file \??\C:\WINDOWS\SysWOW64\\MSAC3ENC.DLL from store

025-03-02 14:21:14, Info                  CSI    000002dd Hashes for file member [l:12]'MSAC3ENC.DLL' do not match.
 Expected: {l:32 ml:33 b:8ed3c1eab827ffa3644861de807c931cb5c79e5cdd1e9f1d43c684b33e7b9806}.
 Actual: {l:32 b:d5824490a1648d73e9b94c806b8fd8ae4827aeeb67da7206f41f704059e4a38d}.
2025-03-02 14:21:14, Info                  CSI    000002de [SR] Repairing file \??\C:\WINDOWS\SysWOW64\\MSAC3ENC.DLL from store
2025-03-02 14:21:14, Info                  CSI    000002df Hashes for file member [l:17]'msmpeg2ac3dec.dll' do not match.
 Expected: {l:32 ml:33 b:43b32b69cd1a6d1a4f95c675a00eff54771a615d89ed93b3a0157633a669c4d2}.
 Actual: {l:32 b:c713a5987f315c8de3379cd51fe48af01572a5ead882256cf49af1a34a204bc6}.
2025-03-02 14:21:14, Info                  CSI    000002e0 [SR] Repairing file \??\C:\WINDOWS\System32\\msmpeg2ac3dec.dll from store
2025-03-02 14:21:14, Info                  CSI    000002e1 Hashes for file member [l:15]'DolbyDecMFT.dll' do not match.
 Expected: {l:32 ml:33 b:9b89194225d8c26feb481f8a9f78cb59ef1a36e00fbad822d44caf92a5b0ec0a}.
 Actual: {l:32 b:b09efc9fc0babd18685248d1b8993ee2d3d0a6c5c2c593ff242e96b997345ec7}.
2025-03-02 14:21:14, Info                  CSI    000002e2 [SR] Repairing file \??\C:\WINDOWS\System32\\DolbyDecMFT.dll from store
2025-03-02 14:21:14, Info                  CSI    000002e3 Hashes for file member [l:12]'MSAC3ENC.DLL' do not match.
 Expected: {l:32 ml:33 b:82419ab082252fb9c6e2d0668ce61b874ad4eef50f9cfe5e57baedd6c166f2bf}.
 Actual: {l:32 b:d5f5d9ce36692518ca6212b234ebd808b0f49a64207cb1319c462e944f688e64}.
2025-03-02 14:21:14, Info                  CSI    000002e4 [SR] Repairing file \??\C:\WINDOWS\System32\\MSAC3ENC.DLL from store
2025-03-02 14:21:14, Info                  CSI    000002e5 Hashes for file member [l:15]'DolbyDecMFT.dll' do not match.
 Expected: {l:32 ml:33 b:6ae48445178ded30298a676da4beae7bee8c72130d826f718cd96a86c96c9892}.
 Actual: {l:32 b:5e104296305cc6b9045fb5c23bfd82368e7b4ff1e4bca6bb5e87f0eee57932b6}.
2025-03-02 14:21:14, Info                  CSI    000002e6 [SR] Repairing file \??\C:\WINDOWS\SysWOW64\\DolbyDecMFT.dll from store
 
Last edited:

My Computer

System One

  • OS
    Windows XP/7/8/8.1/10/11, Linux, Android, FreeBSD Unix
    Computer type
    Laptop
    Manufacturer/Model
    Dell XPS 15 9570
    CPU
    Intel® Core™ i7-8750H 8th Gen Processor 2.2Ghz up to 4.1Ghz
    Motherboard
    Dell XPS 15 9570
    Memory
    32GB using 2x16GB modules
    Graphics Card(s)
    Intel UHD 630 & NVIDIA GeForce GTX 1050 Ti with 4GB DDR5
    Sound Card
    Realtek ALC3266-CG
    Monitor(s) Displays
    15.6" 4K Touch UltraHD 3840x2160 made by Sharp
    Screen Resolution
    3840x2160
    Hard Drives
    Toshiba KXG60ZNV1T02 NVMe 1024GB/1TB SSD
    PSU
    Dell XPS 15 9570
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    Dell XPS 15 9570
    Cooling
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    Stock
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    Comcast/XFinity 1.44Gbps/42.5Mbps
    Browser
    Microsoft EDGE (Chromium based) & Google Chrome
    Antivirus
    Windows Defender that came with Windows
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