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• Android receive RTP/UDP audio stream from VLC/ffmpeg

  23 mai 2016, par Dom4S

  I was searching for a good answer for half a day, but I am a beginner at this stuff and I would appreciate any help.

  What I would like to achieve is to stream audio (mp3 files) within ffmpeg or vlc and receive it on an Android device by udp/rtp.

  This is what I was able to figure out myself sofar :

  1) There is Android class AudioStream and RTPStream. What I don’t know is how to use it. For example I create a stream via ffmpeg with : ffmpeg -re -i mymp3.mp3 -ar 8000 -acodec copy -f rtp rtp://192.168.0.100:5533, where 192.168.0.100 is the address of my Android device. Now I would like to receive it and play it.

  I found something like this on Stack :

  AudioStream audioStream;
  
  AudioGroup audioGroup;
  
  AudioCodec codec = AudioCodec.PCMU;
  
  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_NORMAL);
  
  InetAddress inetAddress;
  
  try {
  
      inetAddress = InetAddress.getByName("163.11.62.208");
  
      audioStream = new AudioStream(inetAddress);
  
      audioStream.setMode(RtpStream.MODE_RECEIVE_ONLY);
  
      audioStream.setCodec(codec);
  
      InetAddress inetAddressRemote = InetAddress.getByName("163.11.169.206");
  
      audioStream.associate(inetAddressRemote, 5004);
  
      audioStream.join(audioGroup);
  
  }

  What is the first inetAddress 163.11.62.208 and what is the second one 163.11.169.206 ? Shoudln’t I just give an address of a stream ?

  2) Can I submit only streams in PCMU format ? Can I stream mp3 files ?

  3) Is it even possible ?

• FFMPEG : Using av_write_frame AFTER av_write_trailer

  20 mars 2024, par Aleksei Komarov

  I'm using avio_alloc_context with my own "write_buffer_proc" to override file i/o.
I am trying to continue writing the stream with av_write_frame AFTER av_write_trailer was called.
But av_write_trailer has some strange side effects.

  


  The result is AV in module 'avformat-58.dll' (Read of address 0000000000000090)
I think that FormatContext becomes invalid after av_write_trailer.
How Can I fix it ?
Can I try to save FormatContext somewhere before calling av_write_trailer ?

  


• How do I allow MPEG tcp 'pull' from FFMPEG

  7 mars 2021, par Ian

  I am using FFMPEG to create a TCP MPEG-2 stream using the following inside of nginx :

  


  exec ffmpeg -i rtmp ://localhost:1935/live/$name -codec copy -g 1 -bsf:v h264_mp4toannexb -f mpegts tcp ://192.168.1.225:1235 ;

  


  I'd like to allow a client to pull a stream from this server rather than pushing to a specific address. Can I do this ?