Step 1: Download Microsoft official website codec from this link. Please follow the step-by-step guide to install the proper codec from Microsoft official website. How to download and install Windows Media Codecs? Install Microsoft MP4 codec or convert the MP4 video to WMP supported formats. To solve the MP4 playing issue on Windows Media Player, there are two feasible methods. If the video or audio streams are encoded by codecs that is not supported by WMP 12, the player won't play the MP4 file correctly either. MP4 is a container format that includes multiple video and audio streams. More over, Windows Media Player 12 may not support all MP4 files. The older Windows Media Player, such as WMP 11 or below, don’t support MP4 at all. Why Does Windows Media Player Not Play MP4 Correctly?Īccording to Microsoft support, only Windows Media Player 12 can support MP4 formats. FAQs of Playing MP4 Videos on Windows Media Player Why Does Windows Media Player Not Play MP4 Correctly? Why Windows Media Player cannot play MP4 correctly? How to make MP4 compatible with Windows Media Player? Is there any other good media player that can play all popular video formats smoothly? Keep reading to find the answers. If you play MP4 files with the default Windows Media Player on your computer, you may often meet with various problems like the MP4 video cannot be played at all, the video and audio are not synchronized or the audio might not be good, etc.

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