![]() This method sometimes solves the Windows Media Player not playing MP4 files on Windows 11 or 10. And codec packs from third-party sites may contain malware that would do harm to your computer. However, you should note this is not 100% working as you properly won’t install a newer codec like HEVC or AV1. Simply follow the on-screen guide to install the missing codecs, or go to MP4 codec sites to download an MP4 codec pack like Media Player Codec Pack, K-Lite Codec Pack, or CCCP to beef up your media player to play all MP4 files easily. Often the case, when your MP4 file won’t play because of missing required codecs, you will receive an error prompt with an error code like "0xc00d5212" and a button to ask you to install missing codecs. Therefore, if your media player lacks the required codecs, MP4 not playing error or poor MP4 playback performance happens. Like MKV and AVI, MP4 is also a container format that could include diverse video and audio codecs, which determines the way you play an MP4 file. Even Windows Media Player 12 only plays those MP4 videos encoded with MPEG-4 video codec and AAC audio codec. In reality, older Windows Media Player (11/10/9/7) has difficulty playing MP4 videos. To solve this, you are suggested to download and install the newest version of your media player. No matter whether you use Windows Media Player, QuickTime Player, or VLC, you can’t play the MP4 video encoded with the newest coding format like HEVC if the default media player is out of date. Now that you have known the reasons, you can use the following ways to solve the MP4 not playing issue. And high video resolution/fps/bitrate often causes choppy video playback problems. Among them, the incompatible format/codec is the main reason to blame. The causes of the MP4 file not playing error are diverse. The MP4 file has been corrupted or damaged.The video resolution, FPS, or bitrate is too high.The settings of your media player are not set properly.The MP4 file format is not supported by your media player.The below words will explain why and how to solve the issue in detail. To just name a few, the MP4 not playing issue is very common yet easy to tackle. Or you may encounter no video, no audio, audio video out of sync, FPS drop, choppy playback, etc. You may receive an error code like "0xc00d36c4" when playing MP4 files with Windows Media Player on Windows 10/11, or the "The file is not compatible with QuickTime Player" error message when playing MP4 on Mac. How to Play MP4 Files on Windows 10/11 and Mac? Free Download for Mac OS X 10.6 or later Table of Contents
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