Make sure your system drivers are up to date before proceeding with the solutions to fix the missing FFMPEG DLL. In some cases, the problem has occurred when accessing websites such as GitHub. Some users have also encountered a “File missing” error message when starting the system. The user experiences an error when trying to install the application, but the installation fails and reports that the FFMPEG.dll file is missing. In addition, a corrupted installation (or attempted installation) of an application can cause the described error. Your system may display a missing FFMPEG DLL if critical system files are corrupted and this DLL cannot be found in the system directory.