X Audio Codec Pack 1.0
If you updated to Windows 11 24H2 and suddenly lost audio on MKV files, DVD rips, or anything encoded with AC-3 or DTS, you are not alone.
Microsoft removed the built-in AC-3 decoder with that release, and the symptom is completely silent playback with no error message - just no sound.
X Audio Codec Pack 1.0 solves this in a single installer, registering seven open-source DirectShow audio filters with Windows so your existing media players pick them up automatically.
What the Pack Installs
The installer includes seven components, all optional except the first one. You can tick or untick each one before anything touches your system.
LAV Audio Decoder is the required component and the reason most people download this pack.
It decodes AC3, DTS, DTS-HD, TrueHD, Dolby Atmos, AAC, HE-AAC, FLAC, Opus, Vorbis, E-AC3, WMA, and PCM - essentially every audio format in active use today.
If audio stopped working after the Windows 11 24H2 update, LAV Audio is the fix.
Once installed, it registers as a DirectShow filter and any player that uses DirectShow - including Windows Media Player, MPC-HC, and MPC-BE - will route audio decoding through it automatically.
MPC Audio Decoder is included as an optional backup path. It handles MP3, AAC, AC3, and DTS and is useful in setups where LAV Audio is already claimed by another filter chain and you need a secondary decoder.
MPC Audio Renderer replaces the default Windows audio output with a WASAPI-based renderer. In exclusive mode it bypasses the Windows audio mixer entirely, sending a bit-perfect signal directly to your sound card or DAC. For casual viewing you do not need this, but for critical listening or home theater setups where the mixer degrades the signal, it makes an audible difference.
MPC AudioSwitcher handles channel mixing, volume normalization, and audio delay compensation. It is the right pick if your MKV files contain multiple audio tracks and you want to switch between them, or if you need to compensate for audio that arrives slightly ahead of or behind the video.
DTS/AC3/DD+ Source Filter solves a separate problem from LAV Audio - it lets you open standalone .dts, .ac3, and .eac3 files directly in any DirectShow player. Without a source filter, double-clicking a .dts file in Windows Explorer produces nothing. With this filter registered, it opens like any other media file.
MPC Audio Splitter handles standalone audio files in formats like FLAC, WAV, AIFF, OGG, and Opus. If you play lossless music through MPC-BE and want reliable container handling for those formats, this is the component to add.
CDDA Reader brings CD audio playback to DirectShow-compatible players. It converts audio CD tracks into a readable wave stream so players like MPC-HC and Windows Media Player can access them without extra software.
Who Needs This Pack
The most common reason to download X Audio Codec Pack is the Windows 11 24H2 audio regression. If you upgraded and lost sound on files that played correctly before - particularly anything with AC-3 or Dolby Digital audio, common on DVD rips and older MKV files - installing LAV Audio from this pack will restore playback immediately.
The second use case is a fresh Windows installation. Microsoft's default audio codec coverage has always had gaps, particularly around DTS and Dolby Digital Plus. Rather than hunting down individual filters from separate sources, X Audio Codec Pack gives you all seven in a single ~15 MB download with individual checkboxes, so you install only what your setup actually needs.
For users who want a complete codec solution covering both video and audio - with MPC-HC included - the K-Lite Codec Pack bundles LAV Filters alongside video decoders, splitters, and a pre-configured media player in one installer.
X Audio Codec Pack is the right choice when you only need to address audio and want to leave your existing video setup untouched.
If you are not sure which audio codec your file is actually missing, the Codec Finder tool on this site identifies the exact decoder required, and the Codec Troubleshooter walks through common playback failures step by step before you download anything.
How to Install
Download the X Audio Codec Pack, run it with administrator rights, and select the components you want using the checkboxes.
LAV Audio is the only required selection - the remaining six are optional depending on your needs. No restart is required. Open your media player and play a previously silent file to confirm audio is restored.
Silent install is supported with the /S flag, which makes this suitable for IT deployments or scripted setups across multiple machines.
If you want to understand how LAV Audio integrates with your player's filter chain and how to configure bitstreaming for TrueHD or DTS-HD passthrough to an AV receiver, the guide Transform Your Media Player with LAV Filters covers that setup in detail.
How It Compares to Installing LAV Filters Alone
LAV Filters from its standalone download includes the full trio: LAV Splitter, LAV Video, and LAV Audio. If you need all three, the standalone download makes sense.
X Audio Codec Pack is purpose-built for audio only - it installs LAV Audio without touching your video decoder or splitter configuration, which is exactly what you want when your video playback is working correctly and only the audio is broken.
The legacy alternative, AC3 Filter, predates LAV Audio and has not been updated since 2013. It remains useful for its advanced equalizer and dynamic range compression controls, but for the Windows 11 24H2 fix specifically, LAV Audio is the correct modern replacement.
X Audio Codec Pack 1.0 runs on Windows 7 through Windows 11, 32-bit and 64-bit. All components are open-source.
The installer is clean with no spyware, adware, or bundled software. The X Codec Pack - the companion full codec pack from the same team - covers video and audio together if you need a complete solution rather than audio only.
