Some ffmpeg features like FFREPORT requires setting environment variables. iOS/tvOS has a native setenv method that can be used for this purpose. However, Android does not provide a built-in API method to set environment variables.

There is already have a setNativeEnvironmentVariable method in MobileFFmpeg Android API. It is used internally by API functions. Increasing its visibility can help users who need to set environment variables in order to use those ffmpeg features.