My windows 10 laptop suddenly stopped properly playing mp4 video files.

The error message states that

Unable to play the file. 
It's possible that this item's file format is not supported, 
the file extension incorrect, or the file data may be broken. 

My laptop is equipped with Windows Media Player, and even though I've been able to play video files without problem until yesterday, it suddenly stopped working.

On the other hand, there was no problem opening and playing wmv video files. I tried installing another media player and open some of the mp4 files and that worked. But when I tried to add those mp4 videos via my Windows Movie Maker it couldn't properly read the video files.

This is problematic because I want to edit videos with the movie maker, and I want to get it work again.

What would be the fix for this?

By the way, my Windows Movie Maker is not the latest version. I think I purchased it around September of 2017.

  • If you right click on an mp4 file and click on Properties, what do you see as the default application for mp4 files? It should still say Windows Media Player. – Mr Ethernet Aug 4 '19 at 12:39
  • It says "MP4 video" and "Windows Media Player", but it's not working. – Sean2014 Aug 4 '19 at 13:01
  • I would install K-Lite Codec Pack Basic, to ensure Windows has codecs for all the main media formats: codecguide.com/download_k-lite_codec_pack_basic.htm It should work after that. – Mr Ethernet Aug 4 '19 at 13:07

Installing a codec pack should fix this.

Try K-Lite Codec Pack Basic.

| improve this answer | |
  • Yeah, that wonderfully worked! Thanks a lot for the help :D – Sean2014 Aug 4 '19 at 13:19
  • Glad I could help! – Mr Ethernet Aug 4 '19 at 13:22

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