How to Fix Windows Media Player Not Playing MP4 Error? Method 1. To solve, below words are about solutions you can refere to. To sum up, MP4 video playback failure in Windows Media Player is probably due to missing required MP4 codecs, incompatible file format, corrupted MP4 video files, high video resolution/FPS, or Windows Media Player software issue. Even Windows Media Player 12 only plays those MP4 videos encoded with MPEG-4 video codec and AAC audio codec. Actually, older Windows Media Player (11/10/9/7) has difficulty playing MP4 videos. There is an issue with the Windows Media Player.It's a notorious problem that Windows Media Player gets choppy when playing 4K videos. The MP4 video resolution, FPS or bitrate is too high.There are some issues with your MP4 video files, for example, the MP4 video has been corrupted or damaged.The Windows Media Player lacks some MP4 codecs required for MP4 video playback, such as H.264, HEVC, AV1, etc.There are several possible reasons for Windows Media Player not playing MP4 problem. Why Won't Windows Media Player Play MP4 Videos? How to Play MP4 Files with Windows Media Player? How to Fix Windows Media Player Not Playing MP4 Error? Free Download for Mac OS X 10.6 or later Table of Contents

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