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• Révision 23487 : Fix #3925 : réparer la validation du dateur quand il est validé par la touche entrée

  25 mars 2017, par brunobergot@gmail.com

  Retour sur r22348 qui cassait ce comportement avec l’introduction d’un button avant le submit de validation, merci marcimat pour le patch :)

• ffplay does not exit in forked child

  6 septembre 2019, par user12030145

  ffplay  -autoexit does not exit in a forked child

  I need to pipe my application (stdout) to ffplay (stdin). I do this by forking ffplay as a child and using -i pipe:0 as argument.

  #include 
  
  #include 
  
  #include <sys></sys>types.h>
  
  #include <sys></sys>wait.h>
  
  
  
  int main(int argc, const char** argv)
  
  {
  
  int tube[2];
  
  int c;
  
  FILE* f = fopen(argv[1], "rb");
  
  pid_t pid;
  
  if (argc &lt; 2) return -1;
  
  if (pipe(tube))  {
  
      perror("Pipe");
  
      return -1;
  
    }
  
  
  
  // main process cats a .mlp file to stdout, sent to a child ffplay stdin through a pipe
  
  char* const arg[] = {"-i", "pipe:0", "-f", "mlp", "-nodisp", "-autoexit", NULL};
  
  switch (pid = fork())    {
  
              case -1:
  
                  fprintf(stderr,"%s\n", "Could not launch ffplay");
  
                  break;
  
  
  
              case 0:
  
                  close(tube[1]);
  
                  dup2(tube[0], STDIN_FILENO);
  
                  execv("/usr/bin/ffplay", arg);
  
                  fprintf(stderr, "%s\n", "Runtime failure in ffplay child process");
  
                  return -2;
  
  
  
              default:
  
                  close(tube[0]);
  
                  dup2(tube[1], STDOUT_FILENO);
  
          }
  
  
  
  // Here the main process code sending the .mlp file to stdout...
  
  
  
  while ((c = fgetc(f)) != EOF) putchar(c);
  
  
  
  waitpid(pid, NULL, 0);
  
  fclose(f);
  
  
  
  // main never returns
  
  return 0;
  
  }

  The issue is that in this context, ffplay -autoexit never exits (GNU-Linux platform). In a main process, ffplay -autoexit always exits at the end of a media file.
  Is there a pure C workaround without using system, popen or scripting ?
  Is this a feature or a bug of ffplay (I cannot tell) ?

• FFMPEG RTSP Replace Video Stream with Holding Slide - Optimization - CPU Related

  29 septembre 2020, par Majickal

  c:\bin\ffmpeg\bin\ffmpeg.exe -rtsp_transport tcp -i rtsp://10.0.0.xx:8554/live -framerate 30 -loop 1 -i "C:\bin\slides\HoldingSlide.png" -tune zerolatency  -x264opts bitrate=2500:vbv-maxrate=2500:vbv-bufsize=250 -c:v libx264 -g 30 -keyint_min 30 -crf 35 -preset superfast -pix_fmt yuv420p -s 1280x720 -c:a aac -b:v 2500k -b:a 192k -ar 24k -map 0:1 -map 1:0 -f flv $INGEST_URL


  


  The above ffmpeg code replaces the rtsp video component of the rtsp stream with a holding slide.
I am seeing high CPU utilization (from the re-streaming server) when running this code and am looking for pointers to optimize it.
Specifically, when ingesting the AV (rtsp) stream to Azure Media Platform

  


  Whilst I am interested in ensuring the holding slide is of an acceptable quality, the core aspect is ensuring the audio quality is not compromised.

  


  Any pointers/suggestions with regards to reducing CPU load would be most welcome.