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• Receiving RTP stream - AudioStream, AudioGroup

  26 août 2015, par totten

  I would like to listen an RTP audio stream, however the voice has little gaps in it - not continues. What may be the solution ? Am I missing something on Receiver(android) side or Streamer(ffmpeg) side ?

  I’m using ffmpeg to stream RTP audio,

  ffmpeg -f lavfi -i aevalsrc="sin(400*2*PI*t)" -ar 8000 -vcodec pcm_u8 -f rtp rtp://192.168.0.15:41954 (port changes.)

  And here is my related android code :

  AudioStream audioStream;
  
  AudioGroup audioGroup;
  
  @Override
  
  public void onStart() {
  
      super.onStart();
  
      StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitNetwork().build();
  
      StrictMode.setThreadPolicy(policy);
  
      AudioManager audio = (AudioManager)getSystemService(AUDIO_SERVICE);
  
      audio.setMode(AudioManager.MODE_IN_COMMUNICATION);
  
      audioGroup = new AudioGroup();
  
      audioGroup.setMode(AudioGroup.MODE_ECHO_SUPPRESSION);
  
      InetAddress inetAddress;
  
      try {
  
          inetAddress = InetAddress.getByName("192.168.0.15");
  
          audioStream = new AudioStream(inetAddress);
  
          audioStream.setCodec(AudioCodec.PCMU);
  
          audioStream.setMode(RtpStream.MODE_NORMAL);
  
          InetAddress inetAddressRemote = InetAddress.getByName("192.168.0.14");
  
          audioStream.associate(inetAddressRemote, 6000);
  
          ((TextView)findViewById(R.id.tv_port)).setText("Port : " + String.valueOf(audioStream.getLocalPort()));
  
          audioStream.join(audioGroup);
  
      }
  
      catch ( UnknownHostException e ) {
  
          e.printStackTrace();
  
      }
  
      catch ( SocketException e ) {
  
          e.printStackTrace();
  
      }
  
  }

• Using FFMPEG via command line in android

  30 décembre 2012, par user1662334

  I want to use FFMPEG via COMMAND LINE in my android application.For this purpose :

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

  This is the code i am using :

  public class FFMPEGActivity 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.

• FFmpeg : To trim a video using 'trim' and specify time using HH:MM:SS format [closed]

  2 juillet 2024, par jsx

  FFmpeg 7.0.1. I want to understand whether it is possible to trim a video using trim and to specify start and end time using the HH:MM:SS format instead of just seconds.

  


  That is, the following command trims a video from 5s to 10s :

  


  ffmpeg -y -i input.mp4 -vf trim=5:10,setpts=PTS-STARTPTS output.mp4


  


  But if I try to specify start and end time using HH:MM:SS format, FFmpeg returns an error :

  


  ffmpeg -y -i input.mp4 -vf trim='00:00:05':'00:00:15',setpts=PTS-STARTPTS output.mp4


  


  ffmpeg -y -i input.mp4 -vf trim=00\:00\:05:00\:00\:15,setpts=PTS-STARTPTS output.mp4


  


  


  Output file is empty, nothing was encoded(check -ss / -t / -frames parameters if used)

  


  


  Is it possible to fix it ? (A guy on Super User suggested trim='00\:00\:05':'00\:00\:15' or trim=00\\:00\\:05:00\\:00\\:15, but I receive the same error message.)

  


  Side questions

  


  


  • To keep the first 5 seconds and drop everything else, I can use ffmpeg -i input.mp4 -vf trim=end=5 output.mp4. But how to keep only the last 5 seconds ?

    


  


  • To drop frist 5 seconds, I can use ffmpeg -i input.mp4 -vf trim=start=5,setpts=PTS-STARTPTS output.mp4. But how to drop the last 5 seconds ?