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:

Troubleshoot Windows Media Player Errors | Microsoft Support

Learn how to troubleshoot Windows Media Player errors. Explore resources for general help with Windows Media Player.
support.microsoft.com support.microsoft.com
 
Click to expand...
Can this codec be saved and reinstalled on lacking systems?
 

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Rollback_Jockey said:
Can this codec be saved and reinstalled on lacking systems?
Click to expand...
I was wondering the same. And when I first read this, briefly went in search of an independent download for it, with no luck.
 

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Dolby is now obsoleted as an audio format. That's why it was removed from Windows 11.
 

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Dolby and DTS are alive and well on my computer.

1719037544930.png
 

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LAV Filters from Github can be installed to restore system wide support for AC-3 and EAC-3 Dolby audio formats.
 

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    HP ZBook G2
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    Intel® Core i7 5500u
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    8 GB
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NormanF said:
LAV Filters from Github can be installed to restore system wide support for AC-3 and EAC-3 Dolby audio formats.
Click to expand...

Yeah, no.

LAV does not exist as an MFT, so it does not restore system wide support.
 

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uncyler825 said:
Windows 11, version 24H2, the AC-3 codec is no longer included with Windows. Now, you can install Microsoft Dolby Digital Decoder/Encoder MFT support into Windows 11 24H2 Build 26100 via AnWave Windows Key-Point.

1. Download AnWave from AnWave
Or AnWave 2024 | AMD Radeon Software Customize Setup - More Radeon Software Installation Options

2. Extract AnWave_v2.1.3.8_20240531_Stable_Release_LS2_Installer.exe. It is a self-extracting file.
3. Run AnWave.exe. Menu > Tools > Windows Key-Point
4. Click Install AC-3 Decoder MFT / Install AC-3 Encoder MFT button.
5. Finish!

Adobe Premiere Pro uses Microsoft's native AC-3 Codec, and you can use this tool to regain AC-3 encoding/decoding support for Windows 11 24H2.
Click to expand...

I just noticed that i could not import mp4 files with 5.1 audio into Premiere Pro, on a fresh install of Win 11 24H2. But when i download AnWave 2024 version 5.42.15.24 there is no option for installing anything AC3 related in the Windows Key Point section.

Was this removed from AnWave?
 

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CPU
Intel Xeon w5-2465X (3.10 GHz)
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It's retained if you upgrade to 24H2 from an earlier version so I guess doing a clean install of 23H2 and then an in-place upgrade would be the solution.
 

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HP
CPU
Intel Xeon w5-2465X (3.10 GHz)
Motherboard
HP Z4 G5
Memory
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GusGhanem said:
Try these: Download Dolby AC-3/AC-4 Installer - MajorGeeks
Click to expand...

Thank you very much! :)

The Dolby AC-3/AC-4 Installer is by far the best decoder in this thread since Windows Media Player as well as Adobe Premiere Pro got audio. I am not a heavy user of Windows Media Player but when i open a file with Dolby Digital audio i get only the video and a pop-up saying that the audio codec is no longer included. That issue is gone as well now! :)
 

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Windows 11 Pro for WorkstationsIntel Xeon w5-2465X (3.10 GHz)128 GBNvidia RTX PRO 4000 Blackwell
OS
Windows 11 Pro for Workstations
Computer type
PC/Desktop
Manufacturer/Model
HP
CPU
Intel Xeon w5-2465X (3.10 GHz)
Motherboard
HP Z4 G5
Memory
128 GB
Graphics Card(s)
Nvidia RTX PRO 4000 Blackwell
Sound Card
On board, Realtek
Monitor(s) Displays
ASUS Swift PG279Q (27")
Screen Resolution
2560x1440
Hard Drives
OS: SK hynix PC801 HFS001TEJ9X101N
Storage: 4 x Samsung 9100 Pro 8TB
Storage: 1 x Samsung 990 Pro 4TB
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Steelseries Apex Pro Gen 3
Mouse
Contour Rollermouse Red
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500/500
Browser
MS Edge
Other Info
This is a HP Z4 G5 Workstation.
2112 said:
Thank you very much! :)

The Dolby AC-3/AC-4 Installer is by far the best decoder in this thread since Windows Media Player as well as Adobe Premiere Pro got audio. I am not a heavy user of Windows Media Player but when i open a file with Dolby Digital audio i get only the video and a pop-up saying that the audio codec is no longer included. That issue is gone as well now! :)
Click to expand...
Does the AnWave not work for everything? Speaking about AnWave, I thought Dolby Digital Atmos would have included Dolby AC-4? Maybe we can let AnWave's author @uncyler825 answer that one.
 

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This is a simpler stand-alone app from the same author that can be used to install Microsoft Dolby Digital Atmos CODECS on Windows 10/11

AnWave-Split (2024)

:))
 

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VladdyProsa said:
This is a simpler stand-alone app from the same author that can be used to install Microsoft Dolby Digital Atmos CODECS on Windows 10/11

AnWave-Split (2024)

:))
Click to expand...
That is mentioned in comment #29. AnWave is also a stand-alone app. Does Dolby Digital Atmos mean AC-3 or also AC-4 as it's confusing.
 

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OS
WindowsXP/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 2.2Ghz up to 4.1Ghz
Motherboard
Dell XPS 15 9570
Memory
64GB using 2x32GB CL16 Mushkin redLine 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 4K UltraHD
Hard Drives
Samsung MZ-V9P4T0B/AM 990 PRO 4TB PCIe®4.0 NVMe™ M.2 SSD was Toshiba KXG60ZNV1T02 NVMe 1TB SSD
PSU
Dell XPS 15 9570
Case
Dell XPS 15 9570
Cooling
Stock
Keyboard
Stock
Mouse
SwitftPoint ProPoint
Internet Speed
Comcast/XFinity 1.44Gbps/42.5Mbps
Browser
Microsoft EDGE (Chromium based) & Google Chrome
Antivirus
Windows Defender that came with Windows
Almighty1 said:
Does the AnWave not work for everything? Speaking about AnWave, I thought Dolby Digital Atmos would have included Dolby AC-4? Maybe we can let AnWave's author @uncyler825 answer that one.
Click to expand...

For me AnWave worked with Adobe apps such as Premiere Pro 2025 but Windows Media Player still gave a pop-up saying that the Dolby codec is not there and was silent, ie no audio. This was with AnWave "standard" and the AnWave stand-alone app. This was solved when i used Dolby AC-3/AC-4 Installer from MajorGeeks.
 

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Windows 11 Pro for WorkstationsIntel Xeon w5-2465X (3.10 GHz)128 GBNvidia RTX PRO 4000 Blackwell
OS
Windows 11 Pro for Workstations
Computer type
PC/Desktop
Manufacturer/Model
HP
CPU
Intel Xeon w5-2465X (3.10 GHz)
Motherboard
HP Z4 G5
Memory
128 GB
Graphics Card(s)
Nvidia RTX PRO 4000 Blackwell
Sound Card
On board, Realtek
Monitor(s) Displays
ASUS Swift PG279Q (27")
Screen Resolution
2560x1440
Hard Drives
OS: SK hynix PC801 HFS001TEJ9X101N
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This is a HP Z4 G5 Workstation.
Almighty1 said:
Does the AnWave not work for everything? Speaking about AnWave, I thought Dolby Digital Atmos would have included Dolby AC-4? Maybe we can let AnWave's author @uncyler825 answer that one.
Click to expand...

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
2112 said:
Windows Media Player still gave a pop-up saying that the Dolby codec is not there and was silent.
Click to expand...

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
 

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Windows 11, version 25H2 (26200)AMD Ryzen 9 9950X 16-Core ProcessorDDR5-6000 (CL36) 64.0 GBNVIDIA GeForce RTX 4090
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Windows 11, version 25H2 (26200)
Computer type
PC/Desktop
CPU
AMD Ryzen 9 9950X 16-Core Processor
Motherboard
ASRock B650M PG Riptide
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GusGhanem said:
Dolby TrueHD, Dolby Digital Plus (E-AC-3) and Dolby AC-4 can contain Atmos.
Click to expand...
Thanks and Interesting, I think I was confused because Dolby Digital originally as it was known was also known as AC-3 so I thought AC-4 was another name for Dolby Atmos. Haven't kept up with the different Dolby names. Which one is the more superior audio, Dolby TrueHD or Dolby AC-4 as it seems Dolby Atmos is more to add up to 64 speakers to any of the three you mentioned. Can Download Dolby AC-3/AC-4 Installer - MajorGeeks also handle Dolby TrueHD?
 

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GusGhanem said:
I'm actually not familiar with Dolby (surround)
Click to expand...

The closest I ever recall hearing it was in a test app to show you the effects. I remember thinking… meh.
Great if you have a 7.1 surround system. I did have (have new ones now) 7.1 enabled headphones. I must admit, it sounds great with movies and games, but this many years later, I have no idea what driver is uses to pass it through to my headphones.
 

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    ㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
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    Wireless Network: Wi-Fi 6E 2x2 AX; Bluetooth® 5.1 or above
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  • Windows 11 Pro 25H2 Build 26200.8655 (Wifes)

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    Memory: 32GB LPD5X-7467

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    Ports: 1 x HDMI 2.1 TMDS; 1 x Novo Button; 1 x Combo Audio Jack
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Almighty1 said:
Thanks and Interesting, I think I was confused because Dolby Digital originally as it was known was also known as AC-3 so I thought AC-4 was another name for Dolby Atmos. Haven't kept up with the different Dolby names. Which one is the more superior audio, Dolby TrueHD or Dolby AC-4 as it seems Dolby Atmos is more to add up to 64 speakers to any of the three you mentioned. Can Download Dolby AC-3/AC-4 Installer - MajorGeeks also handle Dolby TrueHD?
Click to expand...

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.
 

My Computer My Computer

At a glance

Windows 11, version 25H2 (26200)AMD Ryzen 9 9950X 16-Core ProcessorDDR5-6000 (CL36) 64.0 GBNVIDIA GeForce RTX 4090
OS
Windows 11, version 25H2 (26200)
Computer type
PC/Desktop
CPU
AMD Ryzen 9 9950X 16-Core Processor
Motherboard
ASRock B650M PG Riptide
Memory
DDR5-6000 (CL36) 64.0 GB
Graphics Card(s)
NVIDIA GeForce RTX 4090
PSU
1200W
Case
Phanteks Enthoo Pro 2
Cooling
Noctua NH-D12L
GusGhanem said:
I'm actually not familiar with Dolby (surround) as I've never had hardware or setup that uses it, but from what I read, Atmos is an extension to those 3 Dolby formats which adds vertical audio information similar to video game positional audio :think:
Click to expand...
I haven't either since I have always had only a dual channel setup. People used to think Lexicon's Logic 7 was the best when it came to surround sound.
 

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WindowsXP/7/8/8.1/10/11,Linux,Android,FreeBSD...Intel® Core™ i7-8750H 8th Gen 2.2Ghz up to 4....64GB using 2x32GB CL16 Mushkin redLine modulesIntel UHD 630 & NVIDIA GeForce GTX 1050 Ti wi...
OS
WindowsXP/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 2.2Ghz up to 4.1Ghz
Motherboard
Dell XPS 15 9570
Memory
64GB using 2x32GB CL16 Mushkin redLine 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 4K UltraHD
Hard Drives
Samsung MZ-V9P4T0B/AM 990 PRO 4TB PCIe®4.0 NVMe™ M.2 SSD was Toshiba KXG60ZNV1T02 NVMe 1TB SSD
PSU
Dell XPS 15 9570
Case
Dell XPS 15 9570
Cooling
Stock
Keyboard
Stock
Mouse
SwitftPoint ProPoint
Internet Speed
Comcast/XFinity 1.44Gbps/42.5Mbps
Browser
Microsoft EDGE (Chromium based) & Google Chrome
Antivirus
Windows Defender that came with Windows
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