FFmpeg is a set of open source libraries that allow you to record, convert digital audio and video recordings to different formats. It includes libavcodec, a library for encoding and decoding audio and video, and libavformat, a library for muxing and demuxing into a media container. The name comes from the name of the group of experts MPEG and FF, which means fast forward.
FFmpeg is already built into the program and does not require downloading additional codecs.
The conversion is done directly on the device (Internet is not required) and the conversion speed depends on the processor speed of the device.

Supports: MPEG4, h265, h264, mp3, 3gp, aac, ogg (vorbis and theora), opus, vp8, vp9 and many other formats (you will find the list in the application).

Requirements: Android 4.4 and ARMv7, ARMv8, x86, x86_64 processor availability.

FFmpeg with x264, x265, ogg, vorbis, theora, opus, vp8, vp9, mp3lame, libxvid, libfdk_aac, libvo_amrwbenc, libopencore-amr, speex, libsox, libwavpack, libwebp, librtmp

More options can be found in the FFmpeg help pages.

For Android 11 users: The new rules require the app to use more private methods to work with files on your device. You will need to copy/move the input files to a shared folder, such as DCIM,

Mod:
● App Purged
● Works Offline
● Compression Flags Untouched
● No Third Party Patch
● No Additional Component