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• How can I play libvorbis(ogg) streams using ffplay received with udp ?

  31 mars 2017, par crisman

  ffmpeg

  ffmpeg -f dshow -i audio="virtual-audio-capturer" -codec:a libvorbis -b:a 128k -ac 2 -ar 48000 -f mpegts udp://127.0.0.1:1111

  ffplay

  ffplay -codec:a libvorbis -b:a 128k -ar 48000 -ac 2 udp://127.0.0.1:1111

  not playing audio.

  ---

  Other codecs play back working, example below.

  aac working

  ffmpeg -f dshow -i audio="virtual-audio-capturer" -codec:a aac -b:a 128k -ac 2 -ar 48000 -f mpegts udp://127.0.0.1:1111
  
  ffplay -codec:a aac -b:a 128k -ar 48000 -ac 2 udp://127.0.0.1:1111

  opus codec working

  ffmpeg -f dshow -i audio="virtual-audio-capturer" -codec:a libopus -b:a 128k -ac 2 -ar 48000 -f mpegts udp://127.0.0.1:1111
  
  ffplay -codec:a libopus -b:a 128k -ar 48000 -ac 2 udp://127.0.0.1:1111

  mp3 working

  ffmpeg -f dshow -i audio="virtual-audio-capturer" -codec:a mp3 -b:a 128k -ac 2 -ar 48000 -f mpegts udp://127.0.0.1:1111
  
  ffplay -codec:a mp3 -b:a 128k -ar 48000 -ac 2 udp://127.0.0.1:1111

  ---

  why libvorbis not working ?

  transport success, but can not play, i think.

  // not woring ffplay displayed log
  
  ffplay.exe -loglevel debug -codec:a vorbis -b:a 128k -ar 48000 -ac 2 -sync audio -i udp://127.0.0.1:1111
  
  ffplay version N-83781-g3016e91 Copyright (c) 2003-2017 the FFmpeg developers
  
  built with gcc 6.3.0 (GCC)
  
  configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
  
  libavutil 55. 48.100 / 55. 48.100
  
  libavcodec 57. 82.102 / 57. 82.102
  
  libavformat 57. 66.103 / 57. 66.103
  
  libavdevice 57. 3.100 / 57. 3.100
  
  libavfilter 6. 74.100 / 6. 74.100
  
  libswscale 4. 3.101 / 4. 3.101
  
  libswresample 2. 4.100 / 2. 4.100
  
  libpostproc 54. 2.100 / 54. 2.100
  
  [udp @ 0000000000b68700] No default whitelist set sq= 0B f=0/0
  
  [udp @ 0000000000b68700] end receive buffer size reported is 65536
  
  [mpegts @ 0000000000b68ac0] Format mpegts probed with size=2048 and score=50
  
  [mpegts @ 0000000000b68ac0] stream=0 stream_type=6 pid=100 prog_reg_desc=
  
  [mpegts @ 0000000000b68ac0] Before avformat_find_stream_info() pos: 0 bytes read:8208 seeks:0 nb_streams:1
  
  [mpegts @ 0000000000b68ac0] probing stream 0 pp:2500
  
  [mpegts @ 0000000000b68ac0] probing stream 0 pp:2499
  
  [mpegts @ 0000000000b68ac0] probing stream 0 pp:2498
  
  [mpegts @ 0000000000b68ac0] probing stream 0 pp:2497
  
  [mpegts @ 0000000000b68ac0] probing stream 0 pp:2496
  
  [mpegts @ 0000000000b68ac0] probing stream 0 pp:2495
  
  [mpegts @ 0000000000b68ac0] probing stream 0 pp:2494= 0B f=0/0
  
  [mpegts @ 0000000000b68ac0] Probe with size=10038, packets=7 detected mp3 with score=1
  
  [mpegts @ 0000000000b68ac0] probing stream 0 pp:2493= 0B f=0/0
  
  [mpegts @ 0000000000b68ac0] probing stream 0 pp:2492= 0B f=0/0
  
  [mpegts @ 0000000000b68ac0] probing stream 0 pp:2491= 0B f=0/0
  
  [mpegts @ 0000000000b68ac0] Probe with size=18321, packets=10 detected mp3 with score=1
  
  [mpegts @ 0000000000b68ac0] probing stream 0 pp:2490= 0B f=0/0

• ffprobe : fix printing packet side data information

  25 mars 2017, par James Almer

  ffprobe : fix printing packet side data information
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] ffprobe.c
  • [DH] tests/ref/fate/mov-aac-2048-priming

• Copying audio stream via ffmpeg c api

  28 mars 2017, par David Barishev

  I’m trying to replicate ffmpeg command ffmpeg -i <input /> -vn -acodec copy <output></output>,using the C api, in my c++ android project.

  There isn’t too much documentations on the subject, and some of the methods in the example are deprecated and i don’t know how to fix them.

  Here is the code i have worked on, and understood,i have highlited some parts in with the comments :

   extern "C"
  
  int extract_audio(const char *in_filename,const char *out_filename){
  
  
  
      // Library init
  
      SSL_load_error_strings();
  
      SSL_library_init();
  
  
  
      av_register_all ();
  
      avformat_network_init ();
  
  
  
      //Logging init
  
      av_log_set_callback(log_callback_android);
  
  
  
  
  
      //Variable init
  
      AVOutputFormat *ofmt = NULL;
  
      AVFormatContext *ifmt_ctx = NULL, *ofmt_ctx = NULL;
  
      AVPacket pkt;
  
      int ret, i;
  
  
  
      int stream_index = 0;
  
  
  
      //Open input file
  
      if ((ret = avformat_open_input(&ifmt_ctx, in_filename, 0, 0)) < 0) {
  
          av_log(NULL,AV_LOG_FATAL, "Could not open input file '%s'", in_filename);
  
          goto end;
  
      }
  
      if ((ret = avformat_find_stream_info(ifmt_ctx, 0)) < 0) {
  
          av_log(NULL,AV_LOG_FATAL, "Failed to retrieve input stream information");
  
          goto end;
  
      }
  
  
  
      //Print input file stream info
  
      av_dump_format(ifmt_ctx, 0, in_filename, 0);
  
  
  
      //Allocate new context for output file
  
      avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, out_filename);
  
      if (!ofmt_ctx) {
  
          av_log(NULL,AV_LOG_FATAL, "Could not create output context");
  
          ret = AVERROR_UNKNOWN;
  
          goto end;
  
      }
  
  
  
      ofmt = ofmt_ctx->oformat;
  
  
  
      // Iterate over all streams in input file
  
      for (i = 0; i < ifmt_ctx->nb_streams; i++) {
  
          //Stream input
  
          AVStream *in_stream = ifmt_ctx->streams[i];
  
  
  
          //Filter non audio streams
  
          if(in_stream->codecpar->codec_type == AVMEDIA_TYPE_AUDIO){
  
              __android_log_print(ANDROID_LOG_INFO,APPNAME,"Audio stream found");
  
  
  
              AVStream *out_stream = avformat_new_stream(ofmt_ctx, NULL);
  
              if (!out_stream) {
  
                  __android_log_print(ANDROID_LOG_ERROR, APPNAME, "Failed allocating output stream\n");
  
                  ret = AVERROR_UNKNOWN;
  
                  goto end;
  
              }
  
  
  
  
  
              if ((ret = avcodec_parameters_copy(out_stream->codecpar, in_stream->codecpar)) < 0) {
  
                  av_log(NULL, AV_LOG_ERROR, "Copying parameters for stream #%u failed\n", i);
  
                  return ret;
  
              }
  
  
  
              out_stream->time_base = in_stream->time_base;
  
  
  
  
  
          }
  
  
  
      }
  
  
  
      //Dump output format
  
      av_dump_format(ofmt_ctx, 0, out_filename, 1);
  
  
  
      //Open output file
  
      if (!(ofmt->flags & AVFMT_NOFILE)) {
  
          ret = avio_open(&ofmt_ctx->pb, out_filename, AVIO_FLAG_WRITE);
  
          if (ret < 0) {
  
              av_log(NULL, AV_LOG_ERROR, "Could not open output file '%s'", out_filename);
  
              goto end;
  
          }
  
      }
  
  
  
      //Writing output header
  
      if ((ret = avformat_write_header(ofmt_ctx, NULL)) < 0) {
  
          av_log(NULL, AV_LOG_ERROR, "Error occurred when opening output file");
  
          goto end;
  
      }
  
  
  
      while (1) {
  
          AVStream *in_stream, *out_stream;
  
  
  
          if ((ret = av_read_frame(ifmt_ctx, &pkt)) < 0)
  
              break;
  
  
  
          stream_index = pkt.stream_index;
  
  
  
          /* remux this frame without reencoding */
  
          av_packet_rescale_ts(&pkt,
  
                               ifmt_ctx->streams[stream_index]->time_base,
  
                               ofmt_ctx->streams[stream_index]->time_base);
  
  
  
          if ((ret = ret = av_interleaved_write_frame(ofmt_ctx, &pkt)) < 0){
  
              av_log(NULL,AV_LOG_FATAL,"Error muxing packet");
  
              goto end;
  
          }
  
  
  
  
  
          av_packet_unref(&pkt);
  
      }
  
  
  
      av_write_trailer(ofmt_ctx);
  
  
  
      end:
  
      avformat_close_input(&ifmt_ctx);
  
  
  
      /* close output */
  
      if (ofmt_ctx && !(ofmt->flags & AVFMT_NOFILE))
  
          avio_closep(&ofmt_ctx->pb);
  
      avformat_free_context(ofmt_ctx);
  
  
  
  
  
      if (ret < 0 && ret != AVERROR_EOF) {
  
          av_log(NULL,AV_LOG_FATAL, "Error: %s", av_err2str(ret));
  
      }
  
  
  
  }

  This code produces the following output :

  ===Input Information===
  
  
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '<input />':
  
    Metadata:
  
      major_brand     : 
  
          isom
  
      minor_version   : 
  
          512
  
      compatible_brands: 
  
          isomiso2avc1mp41
  
      encoder         : 
  
          Lavf57.25.100
  
      Duration: 
  
          00:00:58.82
  
          , start: 
  
          0.000000
  
          , bitrate: 
  
      7369 kb/s
  
          Stream #0:0
  
              (eng)
  
                  Audio: aac (mp4a / 0x6134706D), 44100 Hz, 2 channels, 160 kb/s
  
              (default)
  
          Metadata:
  
          handler_name    : 
  
              SoundHandler
  
          Stream #0:1
  
              (eng)
  
                  Video: h264 (avc1 / 0x31637661), none, 640x640, 7213 kb/s
  
  
  
              30 fps, 
  
              30 tbr, 
  
              15360 tbn, 
  
              15360 tbc
  
              (default)
  
          Metadata:
  
          handler_name    : 
  
          VideoHandler
  
  
  
  ===Ouput Information===
  
  
  
  Audio stream found
  
  Output #0, adts, to 'out.aac':
  
      Stream #0:0
  
  Audio: aac (mp4a / 0x6134706D), 44100 Hz, 2 channels, 160 kb/s
  
  
  
  ==Packet Logging==
  
  
  
  in: pts:-2048 pts_time:-0.0464399 dts:-2048 dts_time:-0.0464399 duration:1024 duration_time:0.02322 stream_index:0
  
  out: pts:-2048 pts_time:-0.0464399 dts:-2048 dts_time:-0.0464399 duration:1024 duration_time:0.02322 stream_index:0
  
  in: pts:-1024 pts_time:-0.02322 dts:-1024 dts_time:-0.02322 duration:1024 duration_time:0.02322 stream_index:0
  
  out: pts:-1024 pts_time:-0.02322 dts:-1024 dts_time:-0.02322 duration:1024 duration_time:0.02322 stream_index:0
  
  in: pts:0 pts_time:0 dts:0 dts_time:0 duration:1024 duration_time:0.02322 stream_index:0
  
  out: pts:0 pts_time:0 dts:0 dts_time:0 duration:1024 duration_time:0.02322 stream_index:0
  
  in: pts:0 pts_time:0 dts:0 dts_time:0 duration:512 duration_time:0.0333333 stream_index:1

  The snippit handlers file opening, context creation, stream codec copying fine, but crashes after a few loops in the packet muxing part, with signal error :

  Signal: SIGSEGV (signal SIGSEGV: invalid address (fault address: 0x28))

  What did i do wrong ? I wrote this code using some examples and got the code to the current state, but i’m lost now, any help would be greatly appreciated !