The next thing you need to do is to check where the problem actually lies? Is it your MP4 file that is corrupted which is why your VLC is not playing an MP4 video file, or is it your VLC Media Player which is lacking resources to play the file.

Any sort of interruption while downloading can lead to MP4 file corruption making the MP4 file unplayable in VLC Media Player.

MP4 video file header is unreadable or damaged.

VLC media player doesn’t have appropriate codecs to play the MP4 file.When an MP4 file is affected with harmful virus or malware.

Using untrustworthy third-party apps to modify or edit MP4 videos which cause corruption.Interrupted downloading of MP4 video files which make the file corrupted.Improper syncing of audio and video streams in MP4 files which makes it unplayable on VLC.There could various reasons for VLC not playing MP4, the most basic cause might be an outdated version of your VLC Media Player. Being an open-source platform and consisting of great compatibility, MP4 file format is easily supported by VLC, however there can be times wherein your VLC is not playing MP4. VLC has a very user-friendly design and interface. It is designed in an extensible way that allows you to choose multiple modules to control the video output, regardless of the file format they are saved in. (VideoLAN Client) Media Player is the most widely used media player application all over the world. This article is compiled with various sections that are tailor made to answer why is VLC not playing MP4 and provides you easy methods to fix unplayable MP4 video on VLC media player.

Vlc wont play mp4 on mac