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• Android- Error during executing Runtime.getRuntime().exec() - Environment Null -ffmpeg

  18 février 2015, par Chaitanya Chandurkar

  I have compiled ffmpeg library on ubuntu 11.10 and ported compiled files on android.
  After compiling i got libffmpeg.so successfully. It gets loaded on android successfully.

  I am doing it on ubuntu 11.10 eclipse android emulator.

  I have created a small test application which act as command prompt which accepts command from user and displays result. (testing ffmpeg commands)

  When i run simple commands like "ls", "ls -l" it works perfectly. but when i simply type "cd mnt" or "ffmpeg" as command and try to run it. I got Warnings in Logcat saying that

  08-26 16:44:52.553: W/System.err(5961): java.io.IOException: Error running exec(). Command: [ffmpeg] Working Directory: null Environment: null
  
  08-26 16:44:52.573: W/System.err(5961):     at java.lang.ProcessManager.exec(ProcessManager.java:211)
  
  08-26 16:44:52.573: W/System.err(5961):     at java.lang.Runtime.exec(Runtime.java:168)
  
  08-26 16:44:52.573: W/System.err(5961):     at java.lang.Runtime.exec(Runtime.java:241)
  
  08-26 16:44:52.583: W/System.err(5961):     at java.lang.Runtime.exec(Runtime.java:184)
  
  08-26 16:44:52.593: W/System.err(5961):     at ch.ffmpeg.reversit.MainActivity.Execute(MainActivity.java:61)
  
  08-26 16:44:52.593: W/System.err(5961):     at ch.ffmpeg.reversit.MainActivity$1.onClick(MainActivity.java:46)
  
  08-26 16:44:52.593: W/System.err(5961):     at android.view.View.performClick(View.java:3480)
  
  08-26 16:44:52.593: W/System.err(5961):     at android.view.View$PerformClick.run(View.java:13983)
  
  08-26 16:44:52.603: W/System.err(5961):     at android.os.Handler.handleCallback(Handler.java:605)
  
  08-26 16:44:52.603: W/System.err(5961):     at android.os.Handler.dispatchMessage(Handler.java:92)
  
  08-26 16:44:52.603: W/System.err(5961):     at android.os.Looper.loop(Looper.java:137)
  
  08-26 16:44:52.614: W/System.err(5961):     at android.app.ActivityThread.main(ActivityThread.java:4340)
  
  08-26 16:44:52.624: W/System.err(5961):     at java.lang.reflect.Method.invokeNative(Native Method)
  
  08-26 16:44:52.624: W/System.err(5961):     at java.lang.reflect.Method.invoke(Method.java:511)
  
  08-26 16:44:52.634: W/System.err(5961):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
  
  08-26 16:44:52.634: W/System.err(5961):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
  
  08-26 16:44:52.644: W/System.err(5961):     at dalvik.system.NativeStart.main(Native Method)
  
  08-26 16:44:52.644: W/System.err(5961): Caused by: java.io.IOException: Permission denied
  
  08-26 16:44:52.674: W/System.err(5961):     at java.lang.ProcessManager.exec(Native Method)
  
  08-26 16:44:52.674: W/System.err(5961):     at java.lang.ProcessManager.exec(ProcessManager.java:209)
  
  08-26 16:44:52.684: W/System.err(5961):     ... 16 more

  Here is my code :

  imports;
  
  public class MainActivity extends Activity {
  
      String com;
  
      Process process;
  
      EditText command;
  
      Button run;
  
      RelativeLayout main_layout;
  
  
  
      static {
  
       System.loadLibrary("ffmpeg");
  
      }
  
  
  
      /** Called when the activity is first created. */
  
      @Override
  
      public void onCreate(Bundle savedInstanceState) {
  
          super.onCreate(savedInstanceState);
  
          setContentView(R.layout.activity_main);
  
  
  
         //find view 
  
         command=(EditText)findViewById(R.id.command);
  
         run=(Button)findViewById(R.id.run);
  
  
  
          run.setOnClickListener(new OnClickListener() {
  
              public void onClick(View v) {
  
                  com=command.getText().toString();
  
                  try {
  
                      Execute();
  
                  } catch (IOException e) {
  
                      // TODO Auto-generated catch block
  
                      e.printStackTrace();
  
                  } catch (InterruptedException e) {
  
                      // TODO Auto-generated catch block
  
                      e.printStackTrace();
  
                  }
  
  
  
              }
  
          }); 
  
  
  
      }
  
  
  
      public void Execute() throws IOException, InterruptedException{
  
          process=Runtime.getRuntime().exec(com);
  
          // process = pb.command(com).redirectErrorStream(true).start();
  
  
  
          if(process!=null)
  
          ShowOutput();
  
          else
  
          Toast.makeText(getBaseContext(),"Null Process",Toast.LENGTH_LONG).show();
  
      }
  
  
  
      public void ShowOutput() throws IOException, InterruptedException{
  
          String s,text="",errors="";
  
          BufferedReader stdInput = new BufferedReader(new 
  
                  InputStreamReader(process.getInputStream()));
  
  
  
             BufferedReader stdError = new BufferedReader(new 
  
                  InputStreamReader(process.getErrorStream()));
  
  
  
  
  
             TextView output=(TextView)findViewById(R.id.output);
  
             TextView error=(TextView)findViewById(R.id.error);
  
  
  
              while ((s = stdInput.readLine()) != null) {
  
                     text+=s.toString()+"\n";
  
                     System.out.println("Error: "+s);
  
                 }
  
  
  
           output.setText(text);
  
           text="";
  
             // read any errors from the attempted command
  
             System.out.println("Here is the standard error of the command (if any):\n");
  
             while ((s = stdError.readLine()) != null) {
  
                 text+=s.toString()+"\n";
  
                 System.out.println("Error: "+s);
  
             }
  
  
  
             error.setText(text);
  
  
  
             error.setMovementMethod(new ScrollingMovementMethod());
  
             output.setMovementMethod(new ScrollingMovementMethod());
  
  
  
             stdInput.close();
  
             stdError.close();
  
  
  
             process.waitFor();
  
             process.getOutputStream().close();
  
             process.getInputStream().close();
  
             process.getErrorStream().close(); 
  
             process.destroy();
  
  
  
  
  
      }
  
  
  
  }

  I even tried process = pb.command(com).redirectErrorStream(true).start(); for execution. It gives me same error but this time environment was [ANDROID_SOCKET_Zygot] bla bla bla..

  EDIT 1 :
  I use Openjdk on ubuntu

  Help me out !!

• ffmpeg - slideshow from set of images ignoring first image

  24 novembre 2013, par Vishnu

  I can create slideshow with below command

  ffmpeg -y -f image2 -r 1/15 -i image%d.jpeg -y -r 45 video.mp4

  Video is created successfully ,, but its ignoring the 1st image..

  for example in current folder i have

  image1.jpeg
  
  image2.jpeg
  
  image3.jpeg

  but slide show is created with image2.jpeg and image3.jpeg only..(i.e 30 second video with 2 image is created..but i expected 45 second video with 3 images displaying 15 sec per image)

• FFMPEG real-time buffer full frame dropped

  27 janvier 2015, par Burgaz

  I’m using FFMPEG on windows with direct show.
  I’m streaming RTMP (command below) and i need very low latency.
  Once run I get the following errors : [dshow @ 024ce800] real-time buffer 204% full ! frame dropped !

  ffmpeg -threads 6 -f dshow -i video=UScreenCapture -s 1920x1080 -an -vco
  dec libx264 -x264opts keyint=25:min-keyint=20 -b:v 1024k -preset ultrafast -tune zerolatency -crf 22 -r 10 -pix_fmt yuv420p -f flv rtmp ://server...

  Do you have an idea how to handle this kind of error ?

  Thanks
  Ronen