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• Getting exception while trying to run ffmpeg via command line in android

  17 septembre 2012, par user1662334

  I want to use ffmpeg via command line arguments in android application.For this purpose :

  1. I have cross-compiled the ffmpeg lib and got the libffmpeg.so
  2. I have stored libffmpeg.so in files directory of the app.

  This is the code i am using :

  public class MainActivity extends Activity {
  
  
  
      Process p;
  
  
  
      @Override
  
      public void onCreate(Bundle savedInstanceState) {
  
          super.onCreate(savedInstanceState);
  
          setContentView(R.layout.activity_main);
  
  
  
              String[] cmd =new String[4];
  
          cmd[0]="/data/data/com.example.ffmpegnew/files/libffmpeg";
  
          cmd[1]="-i";
  
          cmd[2]="mnt/sdcard/music/baba.mp4";
  
          cmd[3]="mnt/sdcard/music/outfile.mp4";
  
  
  
          p = Runtime.getRuntime().exec(cmd,null, new File("/data/data/com.example.ffmpegnew/files"));
  
  
  
          }
  
          catch(Exception e)
  
          {
  
              System.out.println("exception"+e);
  
          }
  
  
  
      }
  
  
  
  }

  This is the exception i am getting :

  09-17 13:47:01.679: I/System.out(3752): exceptionjava.io.IOException: Error running exec(). Command: [/data/data/com.example.ffmpegnew/files/libffmpeg.so, -i, mnt/sdcard/music/baba.mp4, mnt/sdcard/music/outfile.mp4] Working Directory: /data/data/com.example.ffmpegnew/files Environment: null

  Please tell me how to solve this problem.Thanks in advance.

• Time interval between frames ffmpeg while creating thumnail

  9 février 2017, par rohit phogat

  I am creating a thumbnail sheet from videos inside a folder with 7 rows and 3 columns. I am using following command

  ffmpeg  -i "video.mp4" "ss.jpg" -frames 1 -q:v 1 -vf "select=not(mod(n\,40)),scale=466:-1,tile=3x7" 

  I am not getting desired output. It just create thumnail starting from 00:00:00 and finishes at like 00:01:00

  How can i get time interval of 60 seconds between each frame ?

• sox - increase volume of audio file in middle of track

  23 octobre 2015, par Jon Stevens

  I have an audio track : test.mp3, and I need to be able to increase the volume of the file at a specific time of the file. Basically, I have background music and someone talking, and when the person talking gets done, I want to be able to turn up the background music. I know sox has volume, fade, and gain options but I haven’t found anything that supports doing something like this. I’d prefer sox or ffmpeg, but, if there’s something else that can do this, I’m interested in hearing about it. Keep in mind that I have to keep it a command line tool. Thanks.