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• Audio object type 3 is not supported

  3 octobre 2013, par Ardoramor

  I am running into an issue with a custom-built ffmpeg. Basically, its a vanilla ffmpeg with x264 and fdk-aac libs enabled. I am feeding an SDP file through ffmpeg API and get the following error while passing the info to avcodec_open2 :

  Audio object type 3 is not supported

  My SDP file :

  v=0
  
  o=- 0 0 IN IP4 127.0.0.1
  
  s=Unnamed
  
  i=N/A
  
  c=IN IP4 192.168.1.1
  
  t=0 0
  
  a=recvonly
  
  m=audio 8204 RTP/AVP 96
  
  a=rtpmap:96 mpeg4-generic/32000
  
  a=fmtp:96 streamtype=5; profile-level-id=15; mode=AAC-hbr; config=1a88; SizeLength=13; IndexLength=3; IndexDeltaLength=3;
  
  a=control:trackID=0
  
  m=video 8202 RTP/AVP 96
  
  a=rtpmap:96 H264/90000
  
  a=fmtp:96 packetization-mode=1;profile-level-id=428028;sprop-parameter-sets=Z0KAKJWgKA9E,aM48gA==;
  
  a=control:trackID=1
  
  m=application 8206 RTP/AVP 96
  
  a=rtpmap:96 smpte336m/10
  
  a=control:trackID=2

  The following is the output I get from ffmpeg as I open the input, dump its format, and try to open input streams :

  Format sdp probed with size=2048 and score=50
  audio codec set to : aac
  audio samplerate set to : 32000
  audio channels set to : 1
  video codec set to : h264
  RTP Packetization Mode : 1
  RTP Profile IDC : 42 Profile IOP : 80 Level : 28
  Extradata set to 0xc8d3dc0 (size : 21) !
  File position before avformat_find_stream_info() is 522
  Audio object type 3 is not supported.
  Could not find codec parameters for stream 1 (Video : h264) : unspecified size
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  File position after avformat_find_stream_info() is 522
  Dumping input AV format
  Input #0, sdp, from 'conf/test.sdp' :

  Metadata :
  title :Unnamed
  comment :N/A

  Duration:N/A, bitrate:N/A

  Stream #0:0, 0, 1/32000: Audio: aac, 32000 Hz, 1 channels, fltp  
  
  
  
  Stream #0:1, 0, 1/90000: Video: h264, 90k tbr, 90k tbn, 180k tbc  
  
  
  
  Stream #0:2, 0, 1/90000: Data: none, 0/1  

  Audio object type 3 is not supported.

  I also see the error reported for not finding codec parameters for stream 1 :

  Could not find codec parameters for stream 1 (Video : h264) : unspecified size
  Consider increasing the value for the 'analyzeduration' and 'probesize' options

  However, I think that is due to me not running an actual rtp at the moment of the test.

  In any case, what may be the reason for getting audio object type 3 not supported exception ?

  UPDATE - Oct 02, 2013

  Static ffmpeg build gives the following flags :

  Static ffmpeg 2.0.1 build flag output :

  ffmpeg version 2.0.1 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Sep 30 2013 22:24:00 with gcc 4.1.2 (GCC) 20080704 (Red Hat 4.1.2-54)
  
    configuration: --enable-gpl --enable-nonfree --enable-shared
  
    configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --enable-shared --enable-runtime-cpudetect --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-avfilter --enable-pthreads --enable-x11grab --enable-vdpau --disable-avisynth --enable-libdc1394 --enable-libfaac --enable-libgsm --enable-libmp3lame --enable-libnut --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libx264 --enable-libxavs --enable-libxvid --extra-cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -fPIC' --disable-stripping

  My build is from ffmpeg 2.0.1 snapshot with the following flags :

  --enable-static --disable-shared --enable-gpl --enable-nonfree --enable-libfdk-aac --enable-libfaac --enable-libmp3lame --enable-libx264 --disable-symver --disable-doc --disable-ffplay --enable-ffmpeg --disable-ffprobe --disable-ffserver --disable-avdevice --disable-avfilter --disable-filters --disable-devices --disable-everything --enable-avformat --enable-avcodec --enable-muxers --enable-protocols --enable-parsers --enable-demuxers --enable-decoders --enable-encoders --enable-bsfs --enable-network --enable-swscale  --disable-demuxer=sbg --disable-demuxer=dts --disable-parser=dca --disable-decoder=dca --enable-asm --enable-pthreads --enable-version3

  The fdk-aac library version I'm using :

  fdk-aac - 0.1.2

  So it seems that the same .sdp file causes Audio object type 3 error with my build but not with static but I really do not see what causes it (granted I am not an expert with ffmpeg API and may simply miss important details).

  Simplified code for opening .sdp file that doesn't include error checks and logic separation :

  AVFormatContext *inputContext = NULL;
  
  
  
  av_register_all();
  
  avformat_network_init();
  
  
  
  avformat_open_input(&inputContext, "test.sdp", NULL, NULL);
  
  avformat_find_stream_info(inputContext, NULL);
  
  
  
  int inAudioStreamIdx = av_find_best_stream(inputContext, AVMEDIA_TYPE_AUDIO, -1, -1, NULL, 0);
  
  AVStream *st = inputContext->streams[inAudioStreamIdx];
  
  
  
  AVCodecContext *dec_ctx = st->codec;
  
  AVCodec *dec = avcodec_find_decoder(dec_ctx->codec_id);
  
  
  
  avcodec_open2(dec_ctx, dec, NULL); // Fails here with Audio object type 3

  Am I opening the sdp input improperly ?

• Using Node.js module fluent-ffmpeg to convert video but my files end up corrupt

  19 septembre 2013, par El Guapo

  i am writing a node based media encoding tool and have found a few good node packages that will help me to do this, but the output files are either totally corrupt or it only encodes half the video.

  The main node package i am using is fluent-ffmpeg, and i am trying it with the following code :

  var ffmpeg = require('fluent-ffmpeg');
  
  
  
  var proc = new ffmpeg({ source: 'uploads/robocop-tlr1_h480p.mov', nolog: false})
  
    .withVideoCodec('libx264')
  
    .withVideoBitrate(800)
  
    .withAudioCodec('libvo_aacenc')
  
    .withAudioBitrate('128k')
  
    .withAudioChannels(2)
  
    .toFormat('mp4')
  
    .saveToFile('output/robocop.mp4',
  
      function(retcode, error){
  
          console.log('file has been converted succesfully');
  
  });

  There is not a problem with the source video as i encoded it just fine using FFmpeg normally with the following comand line string (i run it from a batch file) :

  "c:\ffmpeg\bin\ffmpeg.exe" -i %1 -acodec libvo_aacenc -b:a 128k -ac 2 -vcodec libx264 -b:v 800k -f mp4 "../output/robocop2.mp4"

  Any ideas what i am doing wrong here ?

• stream video with transcoded audio only with fluent-ffmpeg and nodejs

  9 septembre 2013, par Tristan

  I'm putting together a simple media server to be able to serve my mkv files to web browsers. The problem is most my files have ac3 audio and I don't really want to recode all my files. So I'm streaming them to the browser with ffmpeg but while doing so they all take a hit to image quality no matter the bitrate I attempt to use.

  What I would ideally like to achieve is using ffmpeg to transcode the audio only and have the video left alone ! See below for the code im currently using :

  new ffmpeg({
  
                  source: sFileName, timeout: 432000
  
              }).toFormat('webm').withVideoBitrate(10000).addOptions(["-sn"]).writeToStream(cResponse, function(){
  
                  console.log(arguments);
  
              });