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• Force ffmpeg to exit with error code whenever thumbnail isn't successfully created

  12 janvier 2017, par user779159

  To get a thumbnail from an image at 100 seconds I can do ffmpeg -ss 100 -i /tmp/video.mp4 -frames:v 1 -s 200x100 image.jpg. However, if the video is less than 100 seconds, ffmpeg doesn’t create a thumbnail but also doesn’t exit with any error code, which is quite unexpected.

  The command exits with no error code (exit status of 0). It only outputs a message on stderr saying Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used).

  I would like ffmpeg to exit with an error code under any situation where a thumbnail hasn’t been created. Otherwise I’ll always have to do another check from my application code after the ffmpeg command to ensure that the expected number of thumbnails has been output to the filesystem.

  Is there a way around having to do this application-level check, and force ffmpeg to fail whenever it doesn’t successfully write a thumbnail to the filesystem ?

• How to make ffmpeg exit when Input is broken

  21 décembre 2016, par APIS

  I have written a bash script to keep a ffmpeg command up and running

  #!/bin/bash
  
  while :
  
      do
  
  
  
          echo `ffmpeg -re -i http://domain.com/index400.m3u8 -vcodec copy -acodec copy -f mpegts udp://127.0.0.1:10000?pkt_size=1316`
  
  done

  The problem is, sometimes the input is broken, yet ffmpeg does not exit when that happens so that it is restarted by the above script. Instead what happens is the same process is kept running eventhough it is not transferring any packet to the UDP address (output). And I need to manually go into the terminal and kill it (kill -9 #processID)

  I need a way to make ffmpeg kill its own process whenever the input is broken.

  Appreciate your help.

• Elegant early exit from a spawned ffmpeg process in C

  21 octobre 2016, par jackson80

  I have a program where I build an ffmpeg command string to capture videos with options input through a gtk3 gui. Once I have all my options selected, I spawn a process with the ffmpeg command string. And I add a child watch to tell me when the process has completed.

    // Spawn child process 
  
    ret = g_spawn_async (NULL, argin, NULL, G_SPAWN_DO_NOT_REAP_CHILD, NULL, NULL, &pid1, NULL);
  
    if ( !ret )
  
    {
  
      g_error ("SPAWN FAILED");
  
      return;
  
    }
  
  
  
  /* Add watch function to catch termination of the process.  This function
  
     * will clean any remnants of process */
  
    g_child_watch_add (pid1, (GChildWatchFunc)cb_child_watch, widget );

  Executing ffmpeg from a terminal using a command line, the program will give an option to input a "q" at the terminal to end the ffmpeg process early.
  Is there any way to send a "q" to that spawned process to elegantly end the ffmpeg ? I’m fairly sure I could kill the process using the process id, but I would rather stop it using a mechanism that allows ffmpeg to gracefully exit..
  This is running Centos 7, kernel 4.7.5, ffmpeg version 3.0.2.
  Since I can still access the terminal where the ffmpeg output is displayed, I’ve tried typing a "q", but it has no effect on the process.