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Sadly, even though you install the Windows Media Player MP4 codec, the WMP not playing MP4 problem still exists.
Part 2: MP4 File Not Playing? Use Windows Media Player Alternative Now you can get the Windows Media Player 12 MP4 playback. Step 4: Once the WMP MP4 codec installation process ends, Windows Media Player restarts automatically. Step 3: Search and download the MP4 codec installation package. Step 2: In the new Windows Media Player Error Message Help window, click the hyperlink below and move into the WMplugin website. Step 1: In the Windows Media Player MP4 not playing dialog, click the Web Help option. You can install MP4 video codecs for Windows Media Player as the following paragraphs show. What to do when you receive the notification saying A codec is required to play this file? Don’t worry about that.
Part 1: How to Play MP4 Files with Windows Media Player 12
Well, you can install the Windows Media Player mp4 codec, or you can use a Windows Media Player alternative to play MP4. There are two ways to fix Windows Media Player not playing MP4 files. It is because Windows Media Player doesn’t support some MP4 codecs. Why MP4 videos don’t play in Windows Media Player 12? Though MP4 is one of the most popular video formats, you are still notified with these files are not supported by Windows Media Player.