Recherche avancée

Sur d’autres sites (13561)

• Windows Pipes STDIN and STDOUT Parent Child proc communication IPC FFMPEG

  15 octobre 2018, par Evren Bingøl

  I am writing a simple WINDOWS app which demonstrates piping,

  I pass byte size data down to child proc, increment the value and send the char size data back to parent and loop until it reaches MAX_CHAR
  Pretty much demonstration of "i++" with IPC.

  Parent Process

  while(i<256){
  
      bSuccess = WriteFile(g_hChildStd_IN_Wr, chBuf, sizeof(char), &dwWritten, NULL);
  
      bSuccess = ReadFile(g_hChildStd_OUT_Rd, chBuf, sizeof(char), &dwRead, NULL); // IF THERE IS NO FFLUSH IT BLOCKS
  
  }

  And in Child

  while (i<256){
  
          byte data=0;
  
          fread(&data, sizeof(char), 1, stdout);
  
          data++;
  
          fwrite(&data, sizeof(char), 1, stdout);
  
          //fflush(stdout); IF I DO NOT HAVE THIS  PARENT BLOCKS ON READ
  
  }

  First of all if I do not FFLUSH child proc stdout, the parent blocks on reading child’s stdout.

  How can one run this code without having to fflush child’s stdout.

  Closing the pipe after child’s first write is not an option as it is in a loop and needs to execute 256 times.

  more generically I want the child to write N bytes to parent, parent read that N bytes do something and write back to child another N bytes and child does something with that N bytes and write to parent N bytes. This happens M times.

  thing is I can not use fflush because my final goal is to use a child process that is not implemented by me.

  My final goal is to pipe data to FFMPEG encode the data and read back from the stdin and do this over and over again with out having to fork a new FFMPEG process for each image frame but rather fork one instance of FFMPEG and pipe data in and read data out from it. And since I did not implement ffmpeg and I can not change the source code.

  thanks

  Thanks

• Anomalie #4194 (Nouveau) : Rendre spip_loader compatible php 7.2

  17 octobre 2018, par Franck D

  Hello :-)
  En faisant une série de test https://www.mail-archive.com/spip-zone@rezo.net/msg46352.html
  Cela m’a fait découvrir que spip_loader avait dans 2 cas chez ovh des problèmes (donc un grave).

  Pour info, pour le voir, il faut obligatoirement faire une nouvelle installation ! Car sans quoi spip_loader fonctionne si un spip est déjà en place !
  Dans le premier cas, spip_loader ne fonctionne pas, dans le deuxième, l’installation fonctionne quand même !

  Environnement : stable
  Version PHP 7.2
  Moteur:phpcgi
  Mode : développement

  Warning : Use of undefined constant _DIR_TMP - assumed ’_DIR_TMP’ (this will throw an Error in a future version of PHP) in /.../pclzip.php on line 28
  Après avoir fait un clique sur "Commencer l’installation"

  Warning : Use of undefined constant _DIR_TMP - assumed ’_DIR_TMP’ (this will throw an Error in a future version of PHP) in /.../pclzip.php on line 28
  Warning : Cannot modify header information - headers already sent by (output started at /.../pclzip.php:28) in /.../spip_loader.php on line 1228

  Environnement : stable
  Version PHP 7.2
  Moteur:php
  Mode : développement

  Warning : Use of undefined constant _DIR_TMP - assumed ’_DIR_TMP’ (this will throw an Error in a future version of PHP) in /.../pclzip.php on line 28
  Après avoir fait un clique sur "Commencer l’installation"

  Warning : Use of undefined constant _DIR_TMP - assumed ’_DIR_TMP’ (this will throw an Error in a future version of PHP) in /.../pclzip.php on line 28

  Franck

• How can I use ffmpeg with youtube-dl ?

  18 octobre 2018, par Dani

  I have this "setup", but it stopped working (I did not change anything in the code) :

    private Process StartFfmpeg(string URL)
  
      {
  
          string args = $"/C youtube-dl --ignore-errors -o - {URL} | ffmpeg -err_detect ignore_err -i pipe:0 -ac 2 -f s16le -ar 48000 pipe:1";
  
          return Process.Start(new ProcessStartInfo
  
          {
  
              FileName = "cmd.exe",
  
              Arguments = args,
  
              UseShellExecute = false,
  
              RedirectStandardOutput = true,
  
              RedirectStandardError = false,
  
              CreateNoWindow = true,
  
          });
  
      }

  (I get the stream by using
  Stream stream = StartFfmpeg(URL).StandardOutput.BaseStream;)
  It just freezes. It doesn’t throw any error (in a try/catch block) and I have the latest version of ffmpeg & youtube-dl. I’ve tried using older versions with no success.
  How can I get it working again ? (This is my first post, sorry if its very bad)