Clean installs of Windows 11 version 24H2 and later no longer include the AC3 (Dolby Digital) codec, and Microsoft’s codec page lists no DTS decoder at all. The safe AC3 codec Windows 11 fix is not a codec pack. Play the file in a player that carries its own decoder, such as VLC, or pass the audio untouched to a receiver or soundbar that decodes it. Only an app that depends on Windows’ own decoder needs more, and then only from the PC maker or the app’s own developer.
Everything below was checked against Microsoft Support pages and the official VLC and LAV Filters project pages. It applies to Windows 11 version 24H2 and later. Codec support changes with Windows updates, so if you read this much later, recheck the Microsoft page linked below before acting.
Why AC3 and DTS go silent on Windows 11
Microsoft states the change plainly on its Codecs in Media Player support page: “Beginning with Windows 11, version 24H2, the AC-3 codec is no longer included with Windows.” The same page lists two exceptions. Many device manufacturers pre-install an AC-3 codec, and a PC upgraded to 24H2 from an earlier version of Windows keeps the one it had.
That gives three situations on PCs that look identical:
| Your PC | Windows AC-3 decoder present? |
|---|---|
| Windows 10, or Windows 11 before version 24H2 | Yes, included |
| Upgraded to 24H2 from an earlier version | Yes, retained |
| Clean install of 24H2 or later | No, unless the manufacturer added one |
DTS is a different story. The same Microsoft page does not mention DTS, and the codec extensions it offers through the Microsoft Store are MPEG-2, HEVC, VP9, AV1 and Web Media. None of them is an audio codec for DTS or AC-3. So on a Windows 11 PC, expect DTS to need the same kind of fix as AC3, whatever version you run.
The practical effect: the picture plays and the sound is missing, or the player reports an unsupported format. The file is usually fine. The decoder is what is missing.
Confirm the codec is really the problem
Before changing anything, spend a minute confirming the diagnosis.
- Check the file’s audio format. Microsoft’s page suggests right-clicking the media file, selecting Properties and opening the Details tab. Files ripped from a DVD or Blu-ray, and many TV recordings, carry AC3 or DTS audio.
- Check your Windows version. Open Settings, then System, then About, and read the version under Windows specifications.
- Try a second file. If a video with ordinary stereo audio plays with sound and the AC3 file does not, the output device is working and the codec is the gap.
If every file is silent, the problem is your output device or volume settings, not AC3.
The safe options, ranked by risk
Each fix below changes a different amount of your system. Start at the top and stop at the first one that works for you.
| Option | What it changes on your PC | Risk | Best for |
|---|---|---|---|
| A player with its own decoder | Adds one app, touches nothing system-wide | Lowest | Watching files |
| Passthrough to a receiver or soundbar | A player setting; Windows decodes nothing | Lowest | Home theater setups |
| The PC maker’s official codec | Restores the Windows decoder | Low | Apps that rely on Windows |
| The app developer’s own decoder | Fixes one specific app | Low | Editing and specialist software |
| LAV Filters from its developer | Adds system-wide DirectShow decoders | Moderate | Players built on DirectShow |
| Codec packs, mirror sites, AC3Filter | Unknown or unmaintained code | High | Nothing; avoid |
AC3 codec Windows 11 fix without installing a codec
The simplest fix leaves Windows alone. Some media players ship their own decoders inside the app, so the 24H2 change never reaches them.
VLC is a widely used example. The VLC features page lists “AC3 – A/52, E-AC-3, MLP / TrueHD” and “DTS” among its supported audio formats, and the VLC home page describes the player as playing “most codecs with no codec packs needed.” The version shown on videolan.org on that date was 3.0.24.
Two cautions:
- Download it only from videolan.org. Copies of popular players are offered on third-party download sites, and a repackaged installer is exactly the risk you are trying to avoid.
- It fixes VLC and nothing else. The decoder lives inside the app, so the Media Player app and any other program that uses Windows’ own decoder stay silent. That is usually fine if you only want to watch.
Passthrough: let your receiver do the decoding
If your PC connects to a receiver or soundbar over HDMI or optical, you may not need a PC decoder at all. With passthrough (also called bitstream), the player sends the AC3 or DTS stream unchanged and the audio hardware decodes it. Windows only carries the data.
This works when three things line up: the player offers a passthrough or bitstream setting, the connection carries the format, and the receiving device supports it. Optical S/PDIF handles standard AC3 and DTS but not the lossless formats, as covered in this guide to what S/PDIF out does. HDMI is more flexible, and the differences between the two HDMI return modes are in HDMI ARC vs eARC.
The common catch is the receiving device. Many TVs and soundbars support Dolby formats but not DTS, so a DTS stream passed through to them plays as silence. If AC3 works and DTS does not, read why DTS or Dolby plays and the other is silent before blaming the PC.
When an app needs Windows’ own decoder
Some programs do not carry their own decoders. They ask Windows, and on a clean 24H2 install Windows has no AC-3 answer. Microsoft’s codec page is written for its Media Player app, which falls in this group. Video editors and other specialist tools may too.
For these, the options narrow:
- Your PC maker’s support page. Microsoft notes that many manufacturers pre-install an AC-3 codec. If yours shipped without one, look on the maker’s official support page for your exact model, not on a general download site.
- The app’s own developer. Some software vendors license and bundle their own AC3 decoder, or publish guidance for 24H2. The vendor’s help pages are the right source for that app.
- Convert the audio track. Re-encoding the AC3 track to a format Windows decodes can make a file usable in a stubborn app, but it is lossy and often drops the surround channels. Keep the original file.
You will also find guides describing third-party utilities that claim to restore the removed Windows component. Microsoft’s support page describes no such method, so this guide does not recommend one.
LAV Filters, for DirectShow players only
Some players, especially older-style ones, rely on DirectShow filters: system-wide decoders any compatible player can use. LAV Filters is an open-source set of DirectShow filters that is still under active development. Its developer’s GitHub releases page (Nevcairiel/LAVFilters), shows version 0.83 released on August 17, 2026, with 0.82 released in June 2026 before it.
Most readers do not need it. VLC does not rely on DirectShow filters, and passthrough does not need a PC decoder. Install LAV Filters only if you use a DirectShow-based player, only from that GitHub releases page, and never as part of a bundle.
Why AC3Filter and codec packs are the wrong fix in 2026
This site shares its name with AC3Filter, the DirectShow filter that once decoded and passed through AC3 and DTS on Windows PCs. The honest advice is still: do not install it on a Windows 11 PC today.
The AC3Filter project was last updated in 2013. A decoder reads every file you open, including files downloaded from anywhere, and software that has not been updated for long has received no fixes for any flaw found after that. There is no maintained version to upgrade to.
All-in-one codec packs carry a different risk. Microsoft’s Codecs FAQ advises caution with “some of the free codec packs” because of “known compatibility issues” that can cause “serious playback problems” and “system corruption.” It recommends installing codecs “only from trusted sources, such as the provider’s official website,” and setting up a system restore point before installing any digital media component. That FAQ is written for Windows Media Player and older Windows versions, but the advice carries over to Windows 11.
Search results for old codec downloads are crowded with mirror sites that repackage installers. You cannot check what a repackaged installer contains, so the safe rule is simple: the official developer page or nothing.
A quick decision path
- You only want to watch the file. Install VLC from videolan.org.
- You have a receiver or soundbar. Turn on passthrough in your player and let the hardware decode.
- One specific app is silent. Check the PC maker’s support page, then the app developer’s help pages.
- Your player depends on DirectShow. Add LAV Filters from its GitHub releases page.
- Someone suggests AC3Filter or a codec pack. Skip it.
FAQ
Can I get an official AC3 codec from the Microsoft Store?
Microsoft’s codec page lists its Store extensions as MPEG-2, HEVC, VP9, AV1 and Web Media, and none of them adds AC-3. Use a player with its own decoder, passthrough, or your PC maker’s official support page instead.
Does Windows 11 play DTS audio?
Microsoft’s codec page does not mention DTS, and no DTS extension appears among the codecs it offers. Plan on a player with a built-in DTS decoder, or passthrough to a receiver that supports DTS.
Will upgrading to 24H2 remove my AC3 codec?
Microsoft says a PC upgraded to Windows 11 version 24H2 from an earlier version retains the AC-3 codec. The removal affects clean installs of 24H2 and later, unless the manufacturer pre-installed a codec.
Is AC3Filter safe to use on Windows 11?
It is not advisable. It has not been updated since 2013, so it has had no fixes for over a decade. Maintained options, such as VLC or LAV Filters, do the same job.
Are codec packs safe?
Microsoft’s Codecs FAQ advises caution with free codec packs because some cause serious playback problems and system corruption, and it recommends installing codecs only from the provider’s official website.
