mp4prasser exception java.io.IOException: open failed:EACCES (Permission denied)

when I run this program(I'm use the mp4prasser Library) I receive an exception:

java.io.IOException: open failed:EACCES (Permission denied)

but in the Manifest I set the permission:

<uses-permission  android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

this is the code(API 17):

public class MainActivity extends AppCompatActivity {
Button mButton;
String Path;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mButton=(Button)findViewById(R.id.button);
    mButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            try {
                Path= Environment.getExternalStorageDirectory().toString()
                +File.separator+"AAAATAG"+File.separator+"abcde.mp4";
                startTrim(Path,Environment.getExternalStorageDirectory().toString(),50000,100000);
            } catch (IOException e) {
                Toast.makeText(MainActivity.this, e.toString(), Toast.LENGTH_SHORT).show();
            }
        }
    });



}

to see the code of the func startTrim(): http://pastebin.com/LDjn3Y7f

Solution

You should look at the logcat output to verify, but it is most likely because of this line (see in your pastebin) of startTrim():

file.getParentFile().mkdirs();

This is attempting to make a destination directory, which the parent of the passed in directory name (Environment.getExternalStorageDirectory()) plus a filename you have generated. No file separator is added. Since that parent directory is a system controlled directory (and already exists) you won't have permissions to create it. The same call is made later in genVideoUsingMp4Parser().

The backtrace in the logcat output should point you right to what call was being made which resulted in the EACCESS error.