How to Fix 0xc00d5212 Playback Errors in Windows 10/11

This 0xc00d5212 error usually shows up in the Media Player app, Movies & TV app, or the classic Windows Media Player when Windows can’t decode the video stream. Typical reasons include:

• The video uses a codec Windows doesn’t natively support (common with HEVC/H.265, AV1, some camera formats).

• Your system codec/decoder is missing or damaged (often after updates).

• The media player cache or settings are corrupted

• GPU/audio/video drivers are outdated or broken

• The video file itself is corrupted (incomplete download, damaged storage)

✅ Best for: You only need the video to play immediately, and you don’t want to change system settings.

A more powerful media player for Windows 10/11 is a quicker yet effective solution when you can’t open files in Windows Media Player or Movie & TV.

VLC is a leading open-source media player that will help you effortlessly open any media file. You can use it as your regular Windows Media Player alternative. It always works like a charm when it comes to video and audio playback.

Steps:

• Download and install VLC through its official website.

• Open the same video using VLC (or another modern player).

• If the video plays fine, the problem is likely your Windows player/codec, not the file.

• If it still fails, move to Fix 2 or Fix 3.

⚠️ Limit: This doesn’t “repair” anything. Your Windows built-in player still fails to play it.

✅ Best for: The file uses an unsupported codec (most common situation), or you want maximum compatibility across Windows apps/devices.

Use a dedicated video converting application to convert the video to MP4 (H.264 video + AAC audio). This combo is one of the most universally supported formats on Windows and TVs, and it avoids many “unsupported encoding” errors.

WonderFox HD Video Converter Factory Pro is an easy-to-use video conversion tool and offers optimized presets for Windows computers. The process is quite simple, even if you know very little about video processing work.

• DownloadDownload, install, and launch the software.

• Open "Converter" and import the video that triggers 0xc00d5212 error.

• Open the output format list on the right side. Go to the "Video" category and select "H.264".

• This allows you to convert videos to the most compatible format - MP4 (H.264 video and AAC audio).

• Click the down-arrow icon at the bottom to choose an output folder.

• Finally, hit the "Run" button.

When the process is complete, you can play the new MP4 files smoothly without the 0xc00d5212 issue.

⚠️ Limit: Converting takes time and creates new files (size may change depending on bitrate settings).

✅ Best for: You want Windows’ built-in player to support the file without converting it.

Many users see this error because Windows is missing codecs like HEVC, AV1, or other uncommon codecs.

Steps

• Identify the codec of your video file (use MediaInfo or file properties if available).

• Search the required codec in Microsoft Store, Free-Codecs.com, or VideoHelp.

• Download and install it on your system.

• Reopen the file in Windows Media Player.

Alternatively, You can also install third-party codec packs to extend its playback functionality. K-Lite Codec Pack is well recognized as the best option for Windows. With it installed on your PC, you should be able to play practically all video and audio files you meet in daily life.

⚠️ Limit: Codec installation may not fix corrupted files, and some codec packs can cause conflicts.

✅ Best for: The error starts suddenly; Media Player/Movies & TV keeps failing; it might be a setting/component issue

Running the Windows Troubleshooter acts as an automated "health check" and performs a diagnostic sweep that covers the most common points of failure for this specific error

Steps:

• Press Win + I to open Settings

• Go to System > Troubleshoot (or Update & Security > Troubleshoot on Windows 10).

• Select Other troubleshooters (or Additional troubleshooters).

• Run these troubleshooters one by one (if available): Video Playback, Playing Audio, and Windows Store Apps

• Follow the prompts, restart your PC, and try playing the video again.

⚠️ Limit: It fixes system configuration/app issues. If the root cause is unsupported codec or the video file is corrupted, you’ll still need install codec / convert video as the real fix.

✅ Best for: Only the built-in player fails, while other players work normally.

Resetting or reinstalling the Windows Media Player app is usually the quickest way to fix performance glitches, playback errors like 0xc00d5212, or a messy media library without having to reinstall your entire operating system.

Steps (the layout of Windows 10 and Windows 11 is slightly different):

• Press Windows + I → go to Apps.

• Find Media Player (or Movies & TV).

• Open Advanced options.

• Click Repair or Reset first; if it still fails, click Uninstall, and then reinstall it from Microsoft Store.

• Try playing the file again.

⚠️ Limit: Resetting may wipe app settings/preferences.

✅ Best for: The error started after updating Windows, or playback fails across multiple applications.

Video and audio drivers act as the bridge between your Media Player and your physical hardware (the Graphics Card or Sound Card). They often provide the required components and compatibility layers Windows uses to play media smoothly.

Steps:

• Right-click Start → open Device Manager.

• Expand Display adapters and Sound, video and game controllers.

• Right-click your device → Update driver.

• Restart the PC and test playback again.

• Try playing the file again.

⚠️ Limit: Driver updates can occasionally introduce new issues; restart is required to confirm results.

✅ Best for: You haven’t updated Windows in a while, or the issue appeared after a system change.

Microsoft releases updates at times, which may bring new features or improvements. When you are faced with playback issues, you can run Windows updates and check for new updates for your computer to see whether it can resolve the problems.

Steps:

• Press Windows + I on your keyboard.

• Go to Updates & Security.

• Select Windows Update.

• Click the Check for updated button.

• Install all updates and restart.

⚠️ Limit: Updates won’t help if the file itself is corrupted or the system is indeed missing the necessary codecs.

A: MP4 is only a container. Inside, the video codec could be: HEVC (H.265), AV1, VVC, or other uncommon codecs. MP4 (H.264 video + AAC audio) is widely supported by Windows built-in players and most devices.

A: Most of the time, yes. This error usually means Windows can’t decode the video because the codec is missing or unsupported in Windows Media Player/Media Player app/Movies & TV app. But in some cases, it can also happen due to corrupted files, driver issues, or a broken playback component.

A: Possible reasons:

• The pack didn’t include the exact decoder your file needs

• Codec conflicts happened (multiple decoders fighting)

• The file is corrupted, so decoding still fails

In this case, converting to MP4 (H.264 + AAC) is usually more reliable than “stacking” codecs.

The seven solutions will help you resolve most "this item was encoded in a format that's not supported 0xc00d5212" errors. Because there are various factors to the error, you may have to try all the possible methods. The fastest way to confirm is trying another player, and the most reliable fix is converting the video to MP4 (H.264 + AAC) for maximum compatibility. If the problem is system-side, resetting the player app, updating drivers, and installing Windows updates usually resolves it.