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• Errors while Audio decoding ?

  13 avril 2015, par Kuldeep More

  Hi all I am decoding audio streaming using FFMPEG API and writing into the .pcm file , but while decoding audio I am getting following errors .
  Also I am using Live555 to receive audio encoded streaming.

  Please tell me what is going wrong in the following code.

  I am calling following function for initializing purpose.

         AVCodec *acodec;
  
         AVCodecContext *ac=NULL;
  
         AVCodecParserContext *parser = NULL;
  
         AVFrame *picture;
  
         AVPacket avpkt;
  
  
  
  
  
  
  
    int initFFMpeg(RTSPClient* rtspClient)
  
    {  
  
        avcodec_register_all();
  
        av_init_packet(&avpkt);
  
        acodec = avcodec_find_decoder(AV_CODEC_ID_AAC);
  
        if (!acodec)
  
        {
  
          fprintf(stderr, "acodec not found audio codec\n");
  
          exit(1);
  
          return 0;
  
        }
  
        ac=avcodec_alloc_context3(acodec);
  
        picture = avcodec_alloc_frame();
  
        ac->skip_loop_filter=AVDISCARD_ALL;
  
        ac->strict_std_compliance = FF_COMPLIANCE_EXPERIMENTAL;
  
        ac->codec_type = AVMEDIA_TYPE_AUDIO;
  
        ac->channels = 2; 
  
        ac->sample_fmt = AV_SAMPLE_FMT_S16; // AV_SAMPLE_FMT_S16
  
        ac->sample_rate = 44100; // 44100
  
        ac->channel_layout = 3; // 3
  
        const AVRational timeBase = {1, ac->sample_rate};
  
        ac->time_base = timeBase;
  
  
  
        if (avcodec_open2(ac,acodec,NULL) < 0)
  
        {
  
          fprintf(stderr, "could not open codec\n");
  
          exit(1);
  
        }
  
    }

  And for decoding audio I am calling following function.

   void decodeaudioframe(unsigned char *fbuffer,int frameSize)
  
   {
  
  
  
    int len,out_size;
  
    unsigned char *buffer = new unsigned char[frameSize];
  
    memcpy(buffer, fbuffer, frameSize);
  
    uint8_t* in = buffer;
  
    int size = frameSize;
  
  
  
    while(size > 0)
  
    {
  
      avpkt.data =in;
  
      avpkt.size = size;
  
  
  
      len = avcodec_decode_audio4(ac, picture,&out_size,&avpkt);
  
  
  
      if (len < 0)
  
       {
  
           fprintf(stderr, "Error while decoding audio frame %d\n", aframe);
  
            break;
  
       }
  
       if(out_size)
  
       {
  
           fprintf(stderr, "Audio decoding audio success frame no= %d\n", aframe);
  
           printf("channels %d",picture->channels);
  
           printf("Sample rate=%d",picture->sample_rate);
  
           fwrite(picture,1,frameSize,faudio);
  
  
  
  
  
       }
  
  
  
       size -= len;
  
       in += len;
  
       ++aframe;
  
   }
  
  
  
    delete []buffer;
  
   }

  Following errors are coming when I run this code.

     [URL:"rtsp://admin:12345@192.168.3.170:554/stream1/"]: Started playing session...
  
    Audio decoding audio success frame no= 0
  
    [aac @ 0xae574e0] Input buffer exhausted before END element found
  
    Error while decoding audio frame 1
  
    [aac @ 0xae574e0] Number of scalefactor bands in group (50) exceeds limit (49).
  
    Error while decoding audio frame 1
  
    [aac @ 0xae574e0] Input buffer exhausted before END element found
  
    Error while decoding audio frame 1
  
    Audio decoding audio success frame no= 1
  
    [aac @ 0xae574e0] Input buffer exhausted before END element found
  
    Error while decoding audio frame 2
  
    [aac @ 0xae574e0] Input buffer exhausted before END element found
  
    Error while decoding audio frame 2
  
    Audio decoding audio success frame no= 2
  
    [aac @ 0xae574e0] Input buffer exhausted before END element found
  
    Error while decoding audio frame 3
  
    [aac @ 0xae574e0] Number of scalefactor bands in group (50) exceeds limit (49).
  
    Error while decoding audio frame 3
  
    [aac @ 0xae574e0] Number of scalefactor bands in group (50) exceeds limit (49).
  
    Error while decoding audio frame 3
  
    Audio decoding audio success frame no= 3
  
    [aac @ 0xae574e0] Input buffer exhausted before END element found
  
    Error while decoding audio frame 4
  
    [aac @ 0xae574e0] Input buffer exhausted before END element found
  
    Error while decoding audio frame 4
  
    Audio decoding audio success frame no= 4
  
    [aac @ 0xae574e0] Input buffer exhausted before END element found

• ffmpeg command to convert Image to video not work in sony and Htc device

  23 juin 2014, par user3223044

  I am using ffmpeg command to convert group of images into video. It work perfect in samsung device but in other device like sony , HTC it not work.Can anyone tell me what is the problem with my code.
  Here is ffmpeg command that i am using__

  "ffmpeg -f image2 -r 1/5 -i /mnt/sdcard/videokit/Image%d.jpg -vcodec mpeg4 -acodec copy -b 12682k -r 29.85 -sameq -vsync 2 output.mp4"

  Thanks

• Redhat 6.9 no IGMP response [on hold]

  13 septembre 2018, par Jamie

  I’m setting up my server to ingest a multicast.

  The server will initiate the request and can join the multicast for about 2:30-3:30 min. After that it gets dropped from the multicast group due to no IGMP response.

  Server is running Redhat 6.9

  Route table has the 224.0.0.0. netmask 240.0.0.0 via eth5. I also have the source IP added to the routeing table, with the multicast.

  I’ve gone through all of the articles on Stackoverflow, and also looked through the Redhat articles and can’t find anything that points to the issue.

  I’m configured for IGMP V3, and i have the rp_filter turned off.

  I’ve also checked the iptables which are off.

  I’m using FFMPEG to pull the stream.