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• Decode android's hardware encoded H264 camera feed using ffmpeg in real time

  31 octobre 2012, par user971871

  I'm trying to use the hardware H264 encoder on Android to create video from the camera, and use FFmpeg to mux in audio (all on the Android phone itself)

  What I've accomplished so far is packetizing the H264 video into rtsp packets, and decoding it using VLC (over UDP), so I know the video is at least correctly formatted. However, I'm having trouble getting the video data to ffmpeg in a format it can understand.

  I've tried sending the same rtsp packets to a port 5006 on localhost (over UDP), then providing ffmpeg with the sdp file that tells it which local port the video stream is coming in on and how to decode the video, if I understand rtsp streaming correctly. However this doesn't work and I'm having trouble diagnosing why, as ffmpeg just sits there waiting for input.

  For reasons of latency and scalability I can't just send the video and audio to the server and mux it there, it has to be done on the phone, in as lightweight a manner as possible.

  What I guess I'm looking for are suggestions as to how this can be accomplished. The optimal solution would be sending the packetized H264 video to ffmpeg over a pipe, but then I can't send ffmpeg the sdp file parameters it needs to decode the video.

  I can provide more information on request, like how ffmpeg is compiled for Android but I doubt that's necessary.

  Oh, and the way I start ffmpeg is through command line, I would really rather avoid mucking about with jni if that's at all possible.

  And help would be much appreciated, thanks.

• ffmpeg - avcodec_decode_audio3 always returns 0 with aac decoding on android

  26 novembre 2011, par Android007

  I am writing an audio decoder based on ffmpeg for android, where I have to decode aac audio, but because of some reason it always returns 0 bytes decoded.

  Looks like I pass everything right. Can anybody tell me what went wrong in my case.I copied code from ffplay.c.
  What is the reason avcodec_decode_audio3 function always returns zero ?

  Here is the code from ffplay.c :

  AVPacket *pkt_temp = &is->audio_pkt_temp;
  
      AVPacket *pkt = &is->audio_pkt;
  
      AVCodecContext *dec= is->audio_st->codec;
  
      int n, len1, data_size;
  
      double pts;
  
  
  
            data_size = sizeof(is->audio_buf1);
  
          len1 = avcodec_decode_audio3(dec, (int16_t *)is->audio_buf1, &data_size, pkt_temp);
  
          if (len1 < 0) {
  
              pkt_temp->size = 0;
  
              break;
  
          } 
  
  
  
         if (data_size <= 0){
  
                     //This block always gets executed.
  
              continue;
  
      }

• Error while executing build.sh in ffmpeg-android

  22 juillet 2013, par Swathi EP

  I downloaded ffmpeg-android from the link : http://bambuser.com/opensource

  I followed the steps given in the file README available in that downloaded folder.

  I tried compiling ffmpeg with both android NDK r5 and r6, but got the same error which is as below :

   arm-linux-androideabi-gcc is unable to create an executable file.
  
  C compiler test failed.
  
  
  
   If you think configure made a mistake, make sure you are using the latest
  
  version from SVN.  If the latest version fails, report the problem to the
  
  ffmpeg-user@mplayerhq.hu mailing list or IRC #ffmpeg on irc.freenode.net.
  
  Include the log file "config.log" produced by configure as this will help
  
  solving the problem.

  Cygwin Version : 1.7.9

  Please someone help me in resolving it.