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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 targeting sdk 24 to 28 .

I am using this library of FFMPEG implementation 'nl.bravobit:android-ffmpeg:1.1.7'

"-y", "-i", path1, "-i", path2, "-filter_complex", "[0:0][1:0] amix=inputs=2:duration=longest", "-c:a", "libmp3lame", savedPath
my Error log:
2019-09-28 13:48:32.037 16041-16166/com.merger.cut E/FFmpeg: Exception while trying to run: [/data/user/0/com..merger.cut/files/ffmpeg, -y, -i, /storage/emulated/0/Music/song1.mp3, -i, /storage/emulated/0/Music/song2.mp3, -filter_complex, [0:0][1:0] amix=inputs=2:duration=longest, -c:a, libmp3lame, /storage/emulated/0/merger/Merge_1569658695254.mp3]
    java.io.IOException: Cannot run program "/data/user/0/com.merger.cut/files/ffmpeg": error=13, Permission denied
        at java.lang.ProcessBuilder.start(ProcessBuilder.java:1050)
        at nl.bravobit.ffmpeg.ShellCommand.run(ShellCommand.java:15)
        at nl.bravobit.ffmpeg.FFcommandExecuteAsyncTask.doInBackground(FFcommandExecuteAsyncTask.java:43)
        at nl.bravobit.ffmpeg.FFcommandExecuteAsyncTask.doInBackground(FFcommandExecuteAsyncTask.java:12)
        at android.os.AsyncTask$3.call(AsyncTask.java:378)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
        at java.lang.Thread.run(Thread.java:919)
     Caused by: java.io.IOException: error=13, Permission denied
        at java.lang.UNIXProcess.forkAndExec(Native Method)
        at java.lang.UNIXProcess.<init>(UNIXProcess.java:133)
        at java.lang.ProcessImpl.start(ProcessImpl.java:141)
        at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)
        at nl.bravobit.ffmpeg.ShellCommand.run(ShellCommand.java:15) 
        at nl.bravobit.ffmpeg.FFcommandExecuteAsyncTask.doInBackground(FFcommandExecuteAsyncTask.java:43) 
        at nl.bravobit.ffmpeg.FFcommandExecuteAsyncTask.doInBackground(FFcommandExecuteAsyncTask.java:12) 
        at android.os.AsyncTask$3.call(AsyncTask.java:378) 
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) 
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167) 
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641) 
        at java.lang.Thread.run(Thread.java:919) 
2019-09-28 13:48:32.146 16041-16041/com.merger.cut E/FFMPEG :: on finish
Give me solution for above problem.
                you may be affected by the new managed scoped access developer.android.com/training/data-storage/files/…
– Stephen Quan
                Sep 28, 2019 at 5:30
                Are you using this library : nl.bravobit:android-ffmpeg:1.1.1 or other please mention hear.
– Viral Patel
                Sep 28, 2019 at 8:09
Now If You Guys Looking For FFMPEG for ANDROID Q Here is link use below FFMPEG Build. Include this to your app/build.gradle 
Min SDK 24
  dependencies {
        implementation 'com.arthenica:mobile-ffmpeg-full:4.3'
Min SDK 16
dependencies {
    implementation 'com.arthenica:mobile-ffmpeg-full:4.2.2.LTS'
tested in OnePlus 7T

Android Q
                I'm using 'com.arthenica:mobile-ffmpeg-full:4.2.2.LTS' But I get this error in build time ' Manifest merger failed : Attribute application@appComponentFactory value=(androidx) from AndroidManifest.xml:10:9-47 	is also present at [androidx.core:core:1.3.2] AndroidManifest.xml:24:18-86 value=(androidx.core.app.CoreComponentFactory). 	Suggestion: add 'tools:replace="android:appComponentFactory"' to <application> element at AndroidManifest.xml:9:5-26:19 to override.'
– Morteza Khodaie
                Nov 5, 2020 at 9:19
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..! 
        
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