FFmpeg is a set of open source libraries that allow you to record, convert digital video and audio recordings in various formats. It includes libavcodec, a library for encoding and decoding audio and video, and libavformat, a library for multiplexing and demultiplexing in a media container. The name comes from the name of the MPEG and FF expert group, which stands for fast forward. FFmpeg is already integrated into the program and does not require downloading additional codecs. The conversion is done directly on the device (no internet required), and the conversion speed depends on the speed of the device's processor.
Required Android Versions : KitKat [4.4–4.4.4] - Lollipop [5.0–5.0.2] - Marshmallow [6.0 - 6.0.1] - Nougat [7.0 – 7.1.1] - Oreo [8.0-8.1]