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• How seeking ffplay or pipe from ffmpeg to ffplay

  5 décembre 2017, par livio

  my goal is to check the file 10 minutes after the start. This is my script.

  ffplay.exe -f lavfi "amovie=input.mov,showvolume=b=4:w=640:h=96" 

  If I add seeking, something like -ss 600, the file always starts from the beginning,

  anyone know workaround ? thanks.

• How is `ffplay` detecting that the sound file from pipe-connected ffmpeg has finished ?

  20 novembre 2017, par Izumi Kawashima

  The following code playes "sample.mp3", and terminates. This is so surprising because the data passed via pipe are binary streams, so ffplay should have no idea about the duration of "sample.mp3", but it terminates right after it reaches the end.

  $ cat sample.mp3 | ffmpeg -i pipe:0 -f mp3 pipe:1 | ffplay -autoexit -

  What binary signal is ffplay watching to detect the terminal of sample.mp3 ?

• Android - How to direct the audio data from MediaRecorder as the input of ffmpeg command via Pipe ?

  3 juin 2013, par Abner311

  I tried to publish audio stream to RTMP server via FFmpeg executable binary.
  I have referred to Android AudioRecord to FFMPEG encode native AAC to create a pipe at Android side and assign the reader part of pipe to ffmpeg command.

   @Override
  
   protected void onCreate(Bundle savedInstanceState) {
  
  
  
      super.onCreate(savedInstanceState);
  
      setContentView(com.example.processtest.R.layout.activity_main);
  
      mediaRecorder = new MediaRecorder();
  
      mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
  
      mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
  
      mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
  
      mediaRecorder.setAudioSamplingRate(44100);
  
      mediaRecorder.setAudioEncodingBitRate(64);
  
  
  
      final ParcelFileDescriptor[] pipe = getPipe();
  
      mediaRecorder.setOutputFile(pipe[1].getFileDescriptor());
  
      try {
  
          mediaRecorder.prepare();
  
      } catch (IllegalStateException e1) {
  
          e1.printStackTrace();
  
      } catch (IOException e1) {
  
          e1.printStackTrace();
  
      }
  
      mediaRecorder.start();
  
  
  
      TextView txt = (TextView)this.findViewById(com.example.processtest.R.id.output);
  
      try {    
  
          p = Runtime.getRuntime().exec("/data/data/com.example.processtest/bin/ffmpeg -re -i pipe:"+ pipe[0].getFd() +" -c copy -f flv rtmp://192.168.2.224:1935/myapp/mystream");   
  
      } catch (IOException e) {
  
          e.printStackTrace();
  
      } 
  
  }
  
  
  
  ParcelFileDescriptor[] getPipe()
  
  {
  
      final String FUNCTION = "getPipeFD";
  
      //FileDescriptor outputPipe = null;
  
      ParcelFileDescriptor[] pipe = null;
  
      try
  
      {
  
          pipe = ParcelFileDescriptor.createPipe();
  
      }
  
      catch(Exception e)
  
      {
  
          Log.e("ProcessTest", FUNCTION + " : " + e.getMessage());
  
      }
  
  
  
      return pipe;
  
  }

  However, I got the error msg like "pipe:55 : Bad file number" :

      $/data/data/com.example.processtest/bin/ffmpeg -re -i pipe:55 -c copy -f flv  rtmp://192.168.2.224:1935/myapp/mystream
  
  
  
     E/ProcessTest(19150):   libavutil      51. 65.100 / 51. 65.100<br />
  
     E/ProcessTest(19150):   libavcodec     54. 41.100 / 54. 41.100<br />
  
     E/ProcessTest(19150):   libavformat    54. 17.100 / 54. 17.100<br />
  
     E/ProcessTest(19150):   libavdevice    54.  1.100 / 54.  1.100<br />
  
     E/ProcessTest(19150):   libavfilter     3.  2.100 /  3.  2.100<br />
  
     E/ProcessTest(19150):   libswscale      2.  1.100 /  2.  1.100<br />
  
     E/ProcessTest(19150):   libswresample   0. 15.100 /  0. 15.100<br />
  
     E/ProcessTest(19150): pipe:55: Bad file number<br />

  Please help me figure out how to assign right pipe fd to ffmpeg command-line process.