Try this command for merge two audio files, but its not working in Android 10.0(Q) while targeting sdk 29.
But, this command is completely working on
For this library is only support maximum sdk 28 see the below link:
https://github.com/bravobit/FFmpeg-Android/blob/master/android-ffmpeg/build.gradle
So,In this library not run in SDK 29 because the targetSdkVersion 28 and compileSdkVersion 28 . If you want to change this thing, it'll work for you. I hope it will help you..!