Right-click the file, go to Properties (Windows) or Get Info (Mac). Look at the "Type of file" or "Kind."
The filename appears to be a video file that has been double-extended or incorrectly renamed. Usually, this happens when a high-definition (1080p) video in an MKV container is converted or renamed to MP4 for better compatibility. 1. Fix the Filename
High-quality movie backups or screen recordings. espl1080.mkv.mp4
A lightweight alternative for Windows users. IINA: A modern, sleek player for macOS users. 3. Troubleshooting Playback Issues
The most reliable option. It will play the file regardless of whether the extension is correct. Right-click the file, go to Properties (Windows) or
If you see a "File Corrupt" error or get audio but no video:
If it is intended to be a standard MP4, rename it to espl1080.mp4 . If it was originally an MKV and the .mp4 was added by mistake, rename it to espl1080.mkv . 2. Recommended Media Players IINA: A modern, sleek player for macOS users
If the file won't open in standard players (like Windows Media Player or QuickTime), use a "universal" player that handles high-definition 1080p content and various containers: