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• avcodec/get_buffer: Don't get AVPixFmtDescriptor unnecessarily

  15 August 2022, by Andreas Rheinhardt

  avcodec/get_buffer: Don't get AVPixFmtDescriptor unnecessarily
  It is unused since 3575a495f6dcc395656343380e13c57d48b9f976
  
  (and the error message is dangerous: av_get_pix_fmt_name(format)
  
  returns NULL iff av_pix_fmt_desc_get(format) returns NULL
  
  and using a NULL string for %s would be UB).
  Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/get_buffer.c

• avformat_open_input return value, error code on NaCl Module

  7 February 2016, by Jar

  I’m trying to port FFmpeg into my NaCl module.

  So far, my module linked ffmpeg and SDL libraries.

  It already can play YUV format video which is directed load into memory and copy into YUVOverlay buffer (it’s very easy).

  Now, I want to use ffmpeg to decode video, but when I call the function avformat_open_input it returns -5 when input is URL string, such as rtmp:// or mmsh://; it returns -1052488119 when input is file name, such as /saved/tmp (I mount the file system - html5fs).

  ---

  There are some questions:

  1. What means of -5 and -1052488119?
  2. If file can’t open by avformat_open_input, is it possible the input type is from buffer not from file name or url string?

  ---

  If I’m not clearly about my question or description, you can tell me.
  If you are doing the same thing or having the same problem, we can discuss together.

  Thanks,
  Jar

• PHP exec or shell_exec not returning process id (PID) on Windows Wamp

  17 May 2013, by HoplaYann

  I am on windows 7, using a WampServer, and trying to use FFMPEG.

  The encoding works, but I can't get a process id back from either the exec()
  method nor the shell_exec() methods.

  This is my code :

  $cmd = C:\ffmpeg\bin\ffmpeg.exe -i "C:\...\4ch.wav"  -ar 44100 -ab 48000 -f mp3 -y "C:\...\enc_4ch.mp3"

  This what I was trying to do with shell_exec :

  shell_exec("nohup $cmd > /dev/null & echo $!");

  And with exec :

  exec("nohup " . $this->_command . " > /dev/null 2>/dev/null &") ; // returns null
  
  exec("nohup " . $this->_command . " > /dev/null 2>&1 &"); // also returns null 

  Please let me know what I do wrong, as I'd like later to use the following method to check if my process is still running :

  private function is_process_running($proccess_id) 
  
      { 
  
          exec("ps $proccess_id", $process_state);
  
          return (count($process_state) >= 2);
  
      }

  thank you in advace