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• Receiving RTP stream - AudioStream, AudioGroup

  21 février 2020, 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();
  
      }
  
  }

• Python read byte array of avi header

  25 février 2020, par CDY

  I am trying to get rtsp data from server using ffmpeg and convert it to avi format then temporary saving in the memory.

  I wish that I can query 2 minutes data then drop first minute only remain and save second minute. As a result, I need to get the avi header firstly.

  However, I don’t know so much about the avi format, so not 100% for sure about my code which get right avi header.

  The header I got is like that :

  b'RIFF\xff\xff\xff\xffAVI LIST&\x01\x00\x00hdrlavih8\x00\x00\x00\x0b\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\t\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'

  and the code I used as following :

  class CCTVReader():
  
  def __init__(self, q, in_stream, name):
  
      super().__init__()
  
      self.isHeader = True
  
      self.q = q
  
      self.name = name
  
      self.startTime = datetime.datetime.timestamp(datetime.datetime.now())
  
      self.in_stream = in_stream
  
      self.chunk_size = 1024
  
      self.command = ["ffmpeg",
  
                      "-c:v", "h264",     
  
                      "-rtsp_transport", "tcp",
  
                      "-i", in_stream,    
  
                      "-c:v", "copy",     
  
                      "-an", "-sn",      
  
                      "-f", "avi",
  
                      "-"]
  
  
  
  def run(self):
  
      pipe = sp.Popen(self.command, stdout=sp.PIPE, bufsize=1024**3)
  
  
  
      while True:
  
          if self.isHeader:
  
              data = pipe.stdout.read(56)
  
              if len(data) < 56:
  
                  break
  
              self.isHeader = False
  
          else:
  
              if datetime.datetime.timestamp(datetime.datetime.now()) - self.startTime >= 60 * 2:
  
                  break
  
              data = pipe.stdout.read(self.chunk_size)       
  
          self.q.put((data, datetime.datetime.timestamp(datetime.datetime.now())))
  
  
  
  
  
  
  
      print("finish", self.in_stream, time.time())

  Could I just put this header with second minute data together and write a avi format video stream ?

• Android : how to film a video before extracting its audio

  20 février 2017, par MrOrgon

  Despite many searches, I haven’t been able to develop a Android prototype able to film a video before extracting its audio as .wav in a separate activity.

  I have developed so far a simple filming activity which relies on Android’s Camera application. My strategty was to put the video’s Uri as Extra to the next activity, before using FFMPEG, but I can’t make the transition between Uri and FFMPEG. Indeed, I’m a fresh Android Studio beginner, so I still am not sure about what concept to use.

  Here’s my code for the video recording activity.

  import android.net.Uri;
  
  import android.os.Build;
  
  import android.os.Bundle;
  
  import android.provider.MediaStore;
  
  import android.widget.Toast;
  
  import android.widget.VideoView;
  
  
  
  import java.io.File;
  
  import java.io.FileInputStream;
  
  import java.io.FileOutputStream;
  
  import java.io.IOException; 
  
  import java.nio.channels.FileChannel;
  
  
  
  import static java.security.AccessController.getContext;
  
  
  
  
  
  public class RecordActivity extends Activity{
  
  
  
  static final int REQUEST_VIDEO_CAPTURE = 0;
  
  
  
  VideoView mVideoView = null;
  
  Uri videoUri = null;
  
  
  
  @Override
  
  public void onCreate(Bundle savedInstanceState) {
  
      super.onCreate(savedInstanceState);
  
      mVideoView = (VideoView) findViewById(R.id.videoVieww);
  
      setContentView(R.layout.activity_record);
  
  
  
      Intent takeVideoIntent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);
  
  
  
      Toast.makeText(RecordActivity.this,         String.valueOf(Build.VERSION.SDK_INT) , Toast.LENGTH_SHORT).show();
  
  
  
      takeVideoIntent.putExtra(MediaStore.EXTRA_OUTPUT, videoUri);
  
      if (takeVideoIntent.resolveActivity(getPackageManager()) != null) {
  
          startActivityForResult(takeVideoIntent, REQUEST_VIDEO_CAPTURE);
  
      }
  
  
  
  }
  
  
  
  
  
      @Override
  
      protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
  
          if (requestCode == REQUEST_VIDEO_CAPTURE && resultCode == RESULT_OK) {
  
              videoUri = intent.getData();
  
  
  
              Intent intentForFilterActivity = new Intent(RecordActivity.this, FilterActivity.class);
  
              intentForFilterActivity.putExtra("VideoToFilter", videoUri.getPath());
  
              startActivity(intentForFilterActivity);
  
  
  
          }
  
      }
  
  }

  Here’s the the code for the audio extraction activity. It is called "FilterActivity", as its final aim is to filter outdoor noise using additional functions. I’m using WritingMinds’ implementation of FFMPEG.
  https://github.com/WritingMinds/ffmpeg-android-java

   import android.app.Activity;
  
   import android.content.Intent;
  
   import android.os.Bundle;
  
   import android.test.ActivityUnitTestCase;
  
   import android.widget.Toast;
  
  
  
   import com.github.hiteshsondhi88.libffmpeg.ExecuteBinaryResponseHandler;
  
   import com.github.hiteshsondhi88.libffmpeg.FFmpeg;
  
   import  com.github.hiteshsondhi88.libffmpeg.exceptions.FFmpegCommandAlreadyRunningException;
  
  
  
  
  
  
  
  public class FilterActivity extends Activity {
  
  
  
  @Override
  
  public void onCreate(Bundle savedInstanceState) {
  
  
  
      super.onCreate(savedInstanceState);
  
      setContentView(R.layout.activity_filter);
  
  
  
      Intent intentVideo = getIntent();
  
      String pathIn = intentVideo.getStringExtra("VideoToFilter");
  
  
  
      FFmpeg ffmpeg = FFmpeg.getInstance(FilterActivity.this);
  
      try {
  
          String[] cmdExtract = {"-i " + pathIn + " extracted.wav"};
  
          ffmpeg.execute(cmdExtract, new ExecuteBinaryResponseHandler() {
  
  
  
              @Override
  
              public void onStart() {}
  
  
  
              @Override
  
              public void onProgress(String message) {}
  
  
  
              @Override
  
              public void onFailure(String message) {
  
                  Toast.makeText(FilterActivity.this, "Failure !", Toast.LENGTH_SHORT).show();
  
              }
  
  
  
              @Override
  
              public void onSuccess(String message) {}
  
  
  
              @Override
  
              public void onFinish() {}
  
          });
  
      } catch (FFmpegCommandAlreadyRunningException e) {
  
      }
  
  }
  
  
  
  
  
  }

  and I always get the "Failure !" message.

  Some parts of the code may look extremely bad. As as written previously, I’m a real Android Studio beginner.

  Do you have any correction that could work ? Or even just a strategy ?

  Thank you in advance !