Frequently Asked Questions

X Codec Pack 3.0 is a 64-bit build that runs on Windows 10 and Windows 11, needs a 64-bit processor (x86-64 / AMD64), and uses about 30 MB of disk space. Installation requires administrator privileges.

Older systems - Windows XP, Vista, 7, 8 or 32-bit Windows - are supported by the legacy X Codec Pack 2.7.4, which remains available on the download page.

The current 3.0 release is 64-bit only. For 32-bit Windows, use X Codec Pack 2.7.4 - it runs on 32-bit and 64-bit systems and supports Windows XP through Windows 8.1. A dedicated 32-bit build of 3.0 may be released on request if there is enough demand.

Yes. Always uninstall any previous codec pack before installing the latest version of X Codec Pack. This prevents DirectShow filter conflicts and ensures optimal playback performance. The installer detects common conflicts automatically, but starting from a clean state is always best practice.

The standard build is around 24 MB and contains only the codec filters. The full build is around 77 MB and bundles MPC-HC (Media Player Classic - Home Cinema) alongside the codecs, giving you a complete media player in one install.

Pick full if you do not already have a preferred player. Pick standard if you use VLC, Kodi, PotPlayer or Windows Media Player and just need the codecs. Both are on the download page.

Yes - both 3.0 and 2.7.4 support silent install. Run the installer with the /S flag for unattended deployment, for example X-Codec-Pack_3.0_Setup.exe /S. This makes it suitable for enterprise rollouts and IT-managed environments.

X Codec Pack 3.0 handles 50+ formats. Headline coverage:

• Video: MKV, MP4, AVI, HEVC (H.265), AV1, H.264, VP9, MPEG-2, MPEG-4, FLV, MOV, WebM, WMV, OGV, DivX, Xvid, RMVB
• Audio: FLAC, AAC, AC3, DTS, E-AC3, TrueHD, MP3, Opus, Vorbis, OGG, WMA, MPC, APE, M4A
• Containers: MKV, MP4, AVI, MOV, WMV, ASF, FLV, OGM, WebM

For a complete list with per-filter details, see the Codec Filters page - every individual DirectShow filter has its own page with version, supported formats, and technical details.

Yes. X Codec Pack bundles LAV Filters with full HEVC support - 8-bit, 10-bit, HDR10, and hardware-accelerated decoding via DXVA2 and D3D11. One install fixes H.265 playback in every DirectShow-compatible player on Windows.

For a deeper dive on H.265 - checking whether your GPU supports hardware decode, fixing "codec not installed" errors, or encoding your own videos - see the HEVC on Windows guide. If you want to encode HEVC yourself, X HEVC Encoder provides a simple GUI wrapping libx265, NVIDIA NVENC, AMD AMF and Intel QSV.

Yes. MPC Video Renderer (included in 3.0) handles 4K UHD playback, HDR10 and Dolby Vision when paired with hardware-accelerated decoding. Smooth 4K playback specifically needs a GPU that supports HEVC hardware decode - most modern NVIDIA (GTX 10-series and newer), AMD (RX 400-series and newer) and Intel (7th-gen and newer) GPUs qualify.

Use the HEVC hardware support checker to confirm your GPU's exact capabilities.

Yes. X Codec Pack registers its filters with the Windows DirectShow subsystem, so any DirectShow-compatible player can use them - Windows Media Player, MPC-HC, PotPlayer, KMPlayer, GOM, SMPlayer and many more.

VLC and MPV use their own internal codecs and won't use X Codec Pack's filters; they will still work normally but do not benefit from the pack. The full build bundles MPC-HC (clsid2 fork) preconfigured for the best out-of-the-box playback.

The main codec pack is a standalone install, but we publish a suite of free companion tools for Windows:

• X Audio Codec Pack - audio-only codec pack, smaller and focused
• X Audio Converter - convert between MP3, FLAC, WAV and more
• X AAC Encoder - encode audio to AAC
• X Sample Rate Converter - change audio sample rates
• X HEVC Encoder - encode video to H.265
• X Codec Inspector - browse installed DirectShow filters and MFTs
• X Radio Stream Finder - browse 35,000+ internet radio stations
• X Drive Writer - write ISO images to USB drives

All are free, portable and contain no bundled software.

Try these steps in order:

• Restart Windows after installation - DirectShow filter registration often needs a reboot to take effect
• Play the file in the bundled MPC-HC first. MPC-HC uses the installed filters directly, which isolates whether the problem is in the codec pack or in another player
• Open X Codec Inspector to see exactly which DirectShow filters and Media Foundation Transforms are registered, and whether there are merit conflicts from a previous codec pack
• Test the file with a different player - if nothing plays it, the file itself may be corrupt or use a container that no codec pack supports
• If problems persist, uninstall all codec packs on your system and reinstall only X Codec Pack fresh

Use X Codec Inspector - a free tool that lists every DirectShow filter and Media Foundation Transform registered on your Windows PC, with merit values, CLSIDs and file paths. It is useful for diagnosing codec conflicts, verifying that X Codec Pack installed correctly, or seeing what legacy codec pack leftovers are still on your system.

Yes. X Codec Pack registers with Windows Programs and Features - uninstall through Settings > Apps > Installed apps on Windows 10/11, or via Control Panel > Programs and Features on older systems. The uninstaller unregisters all DirectShow filters cleanly and removes every file the installer added, leaving no registry leftovers.

Use our alternative mirror at free-codecs.com. If the main link fails due to network conditions or corporate firewall rules, the mirror serves the identical installer from a separate CDN.

Yes, 100% safe. X Codec Pack contains zero spyware, adware, trackers or bundled software. Every component is open-source or verified freeware. We have maintained this no-bloat policy since 2004.

If Windows Defender or another antivirus flags the installer, it is almost always a false positive caused by the NSIS installer wrapper or by the codec pack's on-install filter registration step. You can report the false positive to Microsoft to help clean it up for future downloads.

Yes, X Codec Pack is 100% freeware. You may freely download and use it for personal and commercial purposes. You may not sell, repackage or redistribute it for profit.

The individual components - LAV Filters, MPC-HC, MPC Video Renderer, madVR - each have their own open-source licenses. See the details on each filter's page under Codec Filters.

Yes, X Codec Pack is free for commercial use. Install it on business computers or in corporate environments without any licensing fees. The silent-install flag (/S) and clean uninstall make large-scale IT deployments straightforward.