Recherche avancée

Sur d’autres sites (6684)

• Add comment to match other files

  21 juillet 2014, par tkleinhakisa

  Add comment to match other files

• php exec won't execute what is executable in console regarding audio and video

  29 novembre 2018, par FJ-web

  I have php to run a shell command to start an audio/video stream via ffmpeg. I tried the syntax in the console (as the same user as php [www-data] and from the same location as the php-script :

  pi@raspberrypi:/var/www/html/ $ sudo -H -u www-data ffmpeg {parameters}

  This works nicely. Both audio and video is visible on youtube. When I execute from php with exactly the same parameters

  $pid = exec("ffmpeg {parameters} 2> out.txt");

  the response is

  cannot open audio device hw:1,0 (No such file or directory)

  My first guess was that this had something to do with users and groups, but I can’t tell what. I even put www-data in the sudo group. Still not working.

  If I do

  exec("whoami 2> user.txt");

  the file user.txt is created (with owner www-data) but remains empty. Can anyone help me out ?

  UPDATE
  When I reboot the pi it works only one time. I think that somehow after closing the stream

  exec("kill -9 ".$pid);

  the audio is still busy. The error message is changed in

  cannot open audio device hw:1,0 (Device or resource busy)

  The video (via uv4l : localhost:port/stream/video.mjpeg) is available.

• Redirect ffmpeg console output to a string or a file in C++

  21 juillet 2019, par NeoFahrenheit

  I’m trying to use ffmpeg to do some operations for me. It’s really simple for now. I want to omit the ffmpeg output in my console, either redirecting them to strings or a .txt file that I can control. I’m on Windows 10.

  I have tried _popen (with and "r" and "w") and system("ffmpeg command > output.txt")’, with no success.

  #include <iostream>
  
  #include 
  
  using namespace std;
  
  
  
  #define BUFSIZE 256
  
  
  
  int main()
  
  {
  
      /* 1.
  
      x = system("ffmpeg -i video.mp4 -i audio.mp4 -c copy output.mp4 > output.txt");
  
      */
  
  
  
      /* 2.
  
      FILE* p;
  
      p = _popen("ffmpeg -i video.mp4 -i audio.mp4 -c copy output.mp4", "w");
  
      _pclose(p);
  
      */
  
  
  
      /* 3.
  
      char cmd[200] = { "ffmpeg -i video.mp4 -i audio.mp4 -c copy output.mp4" };
  
  
  
      char buf[BUFSIZE];
  
      FILE* fp;
  
  
  
      if ((fp = _popen(cmd, "r")) == NULL) {
  
          printf("Error opening pipe!\n");
  
          return -1;
  
      }
  
  
  
      while (fgets(buf, BUFSIZE, fp) != NULL) {
  
          // Do whatever you want here...
  
          // printf("OUTPUT: %s", buf);
  
      }
  
  
  
      if (_pclose(fp)) {
  
          printf("Command not found or exited with error status\n");
  
          return -1;
  
      }
  
      */
  
  
  
  
  
      return 0;
  
  }
  
  </iostream>

  Further in the development, I would like to know when the ffmpeg process finished (maybe I can monitor the ffmpeg return value ?) or to display only the last line if the some error occurred.