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• ffmpeg libfdk-aac open coder error and show The encoder timebase is not set

  28 octobre 2019, par RodSteward

  I try to encode some pcm data,and I compile ffmpeg for myself with libfdk-aac,but When I use a aac encoder,It shows timebase is not set,but aac data seems not need a timebase,and even I set the timebase,it shows the same error again

  here is the Initializationcode :

      AVCodec *pCodec;
  
      AVCodecContext *pCodecCtx = NULL;
  
      int i, ret, got_output;
  
      FILE *fp_in;
  
      FILE *fp_out;
  
  
  
      AVFrame *pFrame;
  
      uint8_t* frame_buf;
  
      int size = 0;
  
  
  
      AVPacket pkt;
  
      int y_size;
  
      int framecnt = 0;
  
  
  
      char filename_in[] = "tdjm.pcm";
  
  
  
      AVCodecID codec_id = AV_CODEC_ID_AAC;
  
      char filename_out[] = "tdjm.aac";
  
  
  
      int framenum = 1000;
  
  
  
      avcodec_register_all();
  
  
  
      pCodec = avcodec_find_encoder_by_name("libfdk_aac");
  
      if (!pCodec) {
  
          printf("Codec not found\n");
  
          return -1;
  
      }
  
      pCodecCtx = avcodec_alloc_context3(pCodec);
  
      if (!pCodecCtx) {
  
          printf("Could not allocate video codec context\n");
  
          return -1;
  
      }
  
  
  
      //pCodecCtx->codec_id = codec_id;
  
      pCodecCtx->codec_type = AVMEDIA_TYPE_AUDIO;
  
      pCodecCtx->sample_fmt = AV_SAMPLE_FMT_S16;
  
      pCodecCtx->sample_rate = 44100;
  
      pCodecCtx->channel_layout = AV_CH_LAYOUT_STEREO;
  
      pCodecCtx->channels = av_get_channel_layout_nb_channels(pCodecCtx->channel_layout);
  
      pCodecCtx->bit_rate = 64000;
  
      pCodecCtx->time_base = AVRational{1,10};
  
  
  
      if (avcodec_open2(pCodecCtx, pCodec, NULL) < 0) {
  
          printf("Could not open codec\n");
  
          return -1;
  
      }

• In ffmpeg command-line, how to show all filter settings and their parameters before encoding ?

  7 décembre 2023, par F.X.

  Is there a way to force the ffmpeg command-line to display a comprehensive list of all filters and their parameters, even those that are applied automatically like -vf scale ?

  


  (EDIT : To clarify, I do not mean filter documentation, but rather displaying filters that are instantiated at runtime for a particular command-line, just before transcoding starts. The goal of this is mostly checking that ffmpeg is indeed doing the right thing and not inserting/changing filters when I do not intend it to.)

  


  There are a few options available, but none are comprehensive enough. For example :

  


  

  • The lavfi module has a dumpgraph option (here) but only if you're using lavfi.

  


  • The -sws_flags print_info option (here) can be used to determine if -vf scale is applied automatically and shows a subset of its parameters, but not all of them.

  


  


  Additionally, this question appears related the answer doesn't answer what I'm looking for.

  


  Are there better ways to achieve that ?

  


• ffmpeg segment doesn't show file size update in real time

  9 juillet, par Lucas Cardoso

  I'm trying to run ffmpeg mp3 stream with segmentation for each hour. Everything is working perfectly, except for one thing : when i run the command, the file size doesn't grow in real-time as i need, it only grows in packages of 256k.

  



  Is there a way to turn a "real-time mode" ?

  



  I'm using ubuntu 18.04 with ffmpeg 3.4.6

  



  This is the code i'm trying to run on linux terminal :
  
ffmpeg -i http://radiocentova.conectastm.com:8363/stream -y -acodec libmp3lame -b:a 16k -ac 1 -ar 11025 -vn -strftime 1 -f segment -segment_time 3600 -flush_packets 1 @test_%Y%m%d%H%M%S+00.mp3

  



  
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