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• 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 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;
  
      }

• ffmpeg - Creates a Terminal like Text Video Instead of Slide Show Of Images

  15 novembre 2017, par RAJESH KUMAR ARUMUGAM

  I am using ffmpeg encoder to render Images in my Android App with the Help of this Library

  The following Command is used to Render video from a list of images.

  String command[] = {"-r","1/5","-i",gpxfile.getAbsolutePath(),"-c:v","libx264","-vf","fps=25","-pix_fmt","yuv420p",root.getAbsolutePath()+"/"+"video.mp4"};

  and here the gpxfile is my text file that contains the following

      file '/storage/emulated/0/DCIM/Camera/P_20170807_143916.jpg'
  
      duration 2
  
      file '/storage/emulated/0/DCIM/Pic/P_20170305_142948.jpg'
  
      duration 5
  
      file '/storage/emulated/0/DCIM/Camera/P_20170305_142939.jpg'
  
      duration 6
  
      file '/storage/emulated/0/DCIM/Pic/P_20170305_142818.jpg'
  
      duration 2

  My Problem is While Running the Command it renders a Terminal Like Black Screen with the TextPaths inside the file instead of a Video...!!!
  Any Suggestions...??

  Here is my Project Source Code