Microsoft Edge | Audio and video playback | Windows 11
Managing media playback issues and settings in Microsoft Edge on Windows 11
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its work but i need help
windows media player legacy codecs for 4k stopped working, how to fix
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Michael Blakeney-McMahon
0
Reputation points
windows media player legacy codecs for 4k stopped working, how to fix as media player legacy stopped playback with no error code but media player encountered a problem while playing the file. Ove uninstalled media features, tried every troubleshoot support, and no go
Microsoft Edge | Audio and video playback | Windows 11
2 answers
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(160, 91%, 25%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ERB%3C/text%3E%3C/svg%3E)
Randy Baroja 20,710 Reputation points Independent Advisor2025-10-27T07:18:55.0633333+00:00 Hi,
It sounds like you’ve done quite a bit of troubleshooting already, First, reinstall the HEVC Video Extensions from the Microsoft Store, this codec is required for most 4K and H.265 videos, and even if you had it before, a system update can sometimes break or remove it. Next, reset your Media Feature Pack by turning it off and back on in Optional Features, then reboot, this can refresh damaged components that affect playback. Finally, if playback still fails, try using Windows Media Player (new) or Films & TV to confirm if the issue is codec-related; if those work fine, reinstalling a codec pack such as K-Lite Codec Pack (Standard) can restore legacy compatibility. Have you noticed if this started right after a Windows update, or do only certain file types (like .mkv or .mp4) fail to play?
Kind regards,
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Michael Blakeney-McMahon 0 Reputation points
2025-10-30T19:09:06.9133333+00:00 I have done what you have suggested on numerous occasions before your suggestions. As you pointed out ive come to the same conclusion as later media player and films and tv play the files no probs, thus i think its a codec error in media player classic legacy.
I have a webpage that has embedded video content and the error occurs in there to, while other video formats run just fine. I tried a system roll back to before the error started, and windows failed to complete the task. Seems i have to reinstall windows over from scratch from windows 10 pro, plug in an old wifi card again to get win 10 to 11, as my components aren't supported in win 10. Was happy i worked that one out after buying a god like pc, when the onboard c drive with system shit itself. This was a long process which i endured through as i dont like my pc beating me, i beat it. Gone are the autoexec.bat days with system config files to resurrect computer systems, as windows dont allow any help from the user or its boss
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Michael Blakeney-McMahon 0 Reputation points
2025-10-30T19:17:33.58+00:00 is there a classid code for the latest media player that i can replace in my webpage code to force the latest media player 12 to play my content correctly
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Michael Blakeney-McMahon 0 Reputation points
2025-10-30T19:28:24.0766667+00:00 there are so many troubleshoots out there where one can tell whether the writer has any idea of what their on about or not, and as i am self taught, sifting thought these can do more damage to a system them its worth trying them out in the first place. I am pleased Randy with your reply, and hope we can solve this problem soon
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