: If the video has sound but no picture (or won't play at all), you may need to install a codec pack like the K-Lite Codec Pack to help your player understand the file's compression. What is an MP4?
An MP4 (MPEG-4 Part 14) is a digital multimedia container format most commonly used to store video and audio. It is widely popular because it offers high-quality video in relatively small file sizes, making it the standard for web streaming and portable devices.
The reference to feature: 2119702874761.mp4 appears to relate to the game , where players have discovered they can manipulate game files—specifically by replacing or interacting with video files like the "feature presentation". How to Open or Use MP4 Files
If you are trying to view this specific file or any other MP4 on your device:
: If the default player fails, the VLC media player is a highly recommended free tool that supports nearly all video formats.
For a quick guide on how to create and open these files on your computer, check out this tutorial: How to Create and Open an MP4 File YouTube• Nov 2, 2016
Are you trying to within a game folder or convert it to a different format? How to Create and Open an MP4 File
: Most modern operating systems like Windows and macOS will automatically open MP4 files using default apps like Windows Media Player or QuickTime.