FFMPEG:Merging Audio(.mp3) and single image conver

Question

I want to merge IMAGE + AUDIO and convert them into video using FFMPEG library,i compiled the library successfully,and got libfmpeg.so.but getting problem to execute the ffmpeg command through java code.This is command which i am using... "ffmpeg -i image8.jpg -i file.m4a -acodec copy test.mp4" if i execute this ffmpeg command through CMD,my video.mp4 file is successfully created,but if exceute same command through my Activity,it doesnot create any file.

MY CODE IS:

public class Mpeg extends Activity {

static {

    System.loadLibrary("ffmpeg");

}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_mpeg);

File mf = Environment.getExternalStorageDirectory();

    String livestream = mf.getAbsoluteFile()+"smile.png";

    String folderpth = mf.getAbsoluteFile()+"RABBA.MP3";

    //String output="/home/saicomputer/game.mp4";

    String output = new File(Environment.getExternalStorageDirectory(), "video.mp4").getAbsolutePath();
    Log.i("Test", "Let's set output to " + output);

    String cmd="ffmpeg -i "+ livestream +" -i "+ folderpth +" -acodec copy "+ output;

     Log.e("chck plzzzzz", "after "+ cmd);

    //String jaiho="ffmpeg -i image8.jpg -i file.m4a -acodec copy test.mp4";

    try{

    Process p = Runtime.getRuntime().exec(cmd);

    }
catch(Exception e)
{
    System.out.println("exception"+e);
}

}

enter code here
CONSOLE OUTPUT-
06-05 17:58:11.466: E/image(1189): imageeeeeeeee /mnt/sdcard/smile.png
06-05 17:58:11.466: E/Test(1189): songggggggggg /mnt/sdcard/RABBA.MP3
06-05 17:58:11.476: E/Test(1189): outputttttt /mnt/sdcard/video.mp4
06-05 17:58:11.476: E/chck plzzzzz(1189): after ffmpeg -i /mnt/sdcard/smile.png -i      /mnt/sdcard/RABBA.MP3 -acodec copy /mnt/sdcard/video.mp4

enter code here
06-05 17:58:10.686: D/dalvikvm(1189): Trying to load lib /data/data/com.example.myfmpeg /lib/libffmpeg.so 0x412a5cf0
06-05 17:58:10.756: I/dalvikvm(1189): threadid=3: reacting to signal 3
06-05 17:58:10.955: D/dalvikvm(1189): Added shared lib /data/data/com.example.myfmpeg/lib/libffmpeg.so 0x412a5cf0
06-05 17:58:10.955: D/dalvikvm(1189): No JNI_OnLoad found in /data/data/com.example.myfmpeg/lib/libffmpeg.so 0x412a5cf0, skipping init
06-05 17:58:11.024: I/dalvikvm(1189): Wrote stack traces to '/data/anr/traces.txt'
06-05 17:58:11.215: I/dalvikvm(1189): threadid=3: reacting to signal 3
06-05 17:58:11.326: I/dalvikvm(1189): Wrote stack traces to '/data/anr/traces.txt'
06-05 17:58:11.466: E/image(1189): imageeeeeeeee /mnt/sdcard/smile.png
06-05 17:58:11.466: E/Test(1189): songggggggggg /mnt/sdcard/RABBA.MP3
06-05 17:58:11.476: E/Test(1189): outputttttt /mnt/sdcard/video.mp4
06-05 17:58:11.476: E/chck plzzzzz(1189): after ffmpeg -i /mnt/sdcard/smile.png -i /mnt/sdcard/RABBA.MP3 -acodec copy /mnt/sdcard/video.mp4
0 6-05 17:58:11.896: E/AndroidRuntime(1189): FATAL EXCEPTION: main
06-05 17:58:11.896: E/AndroidRuntime(1189): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.myfmpeg/com.example.myfmpeg.Mpeg}: java.lang.RuntimeException: java.io.IOException: Error running exec(). Command: [ffmpeg, -i, /mnt/sdcard/smile.png, -i, /mnt/sdcard/RABBA.MP3, -acodec, copy, /mnt/sdcard/video.mp4] Working Directory: null Environment: null
06-05 17:58:11.896: E/AndroidRuntime(1189):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
06-05 17:58:11.896: E/AndroidRuntime(1189):     at 
06-05 17:58:11.896: E/AndroidRuntime(1189): Caused by: java.lang.RuntimeException: java.io.IOException: Error running exec(). Command: [ffmpeg, -i, /mnt/sdcard/smile.png, -i, /mnt/sdcard/RABBA.MP3, -acodec, copy, /mnt/sdcard/video.mp4] Working Directory: null       Environment: null