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• I want to get the data of the MPEG2ts data stream

  26 juin 2020, par 夏目たかし

  I want to get the data of the MPEG2ts data stream using FFMPEG.

  


  Delivery side :

  


  ffmpeg -re -i hoge.ts -map 0 -c copy -f mpegts udp://127.0.0.1:5004


  


  Receiver :

  


  ffmpeg -i udp://127.0.0.1:5004 -map 0:1 -codec copy -f data stream.txt


  


  I started two command prompts and both were running on one PC.

  


  disp Delivery side message :

  


  Input #0, mpegts, from 'E:/Day_Flight.mpg':
  Duration: 00:03:14.88, start: 10.000000, bitrate: 4187 kb/s
  Program 1
    Stream #0:0[0x1e1]: Video: h264 (Main) ([27][0][0][0] / 0x001B), 
yuv420p(progressive), 1280x720, 60 fps, 60 tbr, 90k tbn, 180k tbc
    Stream #0:1[0x1f1]: Data: klv (KLVA / 0x41564C4B)
Output #0, mpegts, to 'udp://127.0.0.1:5004':
  Metadata:
    encoder         : Lavf58.47.100
    Stream #0:0: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(progressive), 1280x720, q=2-31, 60 fps, 60 tbr, 90k tbn, 90k tbc
    Stream #0:1: Data: klv (KLVA / 0x41564C4B)
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)


  


  disp Receiver message :

  


  Input #0, mpegts, from 'udp://127.0.0.1:5004':
  Duration: N/A, start: 1.400000, bitrate: N/A
  Program 1
    Metadata:
      service_name    : Service01
      service_provider: FFmpeg
    Stream #0:0[0x100]: Video: h264 (Main) ([27][0][0][0] / 0x001B), 
yuv420p(progressive), 1280x720, 60 fps, 60 tbr, 90k tbn, 180k tbc
    Stream #0:1[0x101]: Data: klv (KLVA / 0x41564C4B)
Output #0, data, to 'stream.txt':
  Metadata:
    encoder         : Lavf58.47.100
    Stream #0:0: Data: klv (KLVA / 0x41564C4B)
Stream mapping:
  Stream #0:1 -> #0:0 (copy)


  


  However, the contents of steram.txt are empty.
Please give me some advice.

  


• Keep bash script running child processes until bash script end

  17 septembre 2014, par Xeoncross

  I would like to keep a command running (in this case ffmpeg) until a certain time.

  The best way I know to do this is to wrap that command in a bash script that will keep checking to make sure it’s running.

  If it dies before that time, the script should restart it. I’m having trouble figuring out how do this. It seems like keeping a process running/restarting as needed until a term signal is a pretty common task.

  I can’t use a crontab entry because I have to wait until X outside source starts this process (and ultimately sends the terminate signal).

  #!/bin/bash
  
  
  
  #launch_ffmpeg()
  
  #{
  
  #   ffmpeg -i rtmp://localhost/$1/$2 -c copy -f flv rtmp://localhost/$1/$2 &
  
  #   return $!
  
  #}
  
  
  
  on_die ()
  
  {
  
      # kill all children
  
      pkill -KILL -P $$
  
  }
  
  
  
  trap 'on_die' TERM
  
  
  
  # I think this is wrong
  
  while :
  
      do
  
          ffmpeg -i rtmp://localhost/$1/$2 -c copy -f flv rtmp://localhost/$1/$2 &
  
          wait $!
  
          sleep 10
  
  done

• How to save data of packet.data using ffmpeg && c language ?

  12 juin 2015, par patrick

  I’m try to build an app in c that extract audio from video and save it as audio file. I’m able to extract the audio but now the problem is how to save it. I wrote the code given below but it’s giving me an segmentation fault. Thanks in advance.

  My code is :

  AVOutputFormat* fmt = av_guess_format("mp3", NULL, NULL);;
  
  AVFormatContext* oc = avformat_alloc_context();
  
  oc->oformat = fmt;
  
  avio_open2(&oc->pb, "test.mp3", AVIO_FLAG_WRITE,NULL,NULL);
  
  
  
  AVStream* stream=NULL;
  
  int cnt = 0;
  
  
  
  while(av_read_frame(pFormatCtx, &packet)>=0) { //pFormatCtx is input file format context.
  
      if (packet.stream_index==audioStream) {
  
      int got_frame = 0;
  
      if (avcodec_decode_audio4(pCodecCtx, pFrame, &got_frame, &packet) < 0) {
  
          fprintf(stderr, "Error encoding frame\n");
  
                  exit(1);
  
          }
  
  
  
          if(got_frame) {
  
          if (av_interleaved_write_frame(oc, &packet) < 0) {
  
                  printf(stderr, "Error writing frame\n");
  
                      exit(1);
  
                  }
  
          }
  
      }
  
      av_free_packet(&packet);
  
      av_init_packet(&packet);
  
  }