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• Problem : av_seek_frame() always returns me the beginning of the video

  3 novembre 2020, par ZWen

  I'm currently trying to making use of FFMpeg to build a player. When I'm using av_seek_frame() to change the timestamp, it always gives me the beginning of the stream.

  


  Here is my code :

  


  bool XDemux::Seek(double pos)
{
    mux.lock();
    if (!ic)
    {
        mux.unlock();
        return false;
    }
    avformat_flush(ic);

    long long seekPos = 0;
    seekPos = ic->streams[videoStream]->duration * pos;
    int re = av_seek_frame(ic, videoStream, seekPos, AVSEEK_FLAG_BACKWARD | AVSEEK_FLAG_FRAME);
    mux.unlock();
    if (re < 0)
    {
        return false;
    }
    return true;
}


  


  Where ic and mux are defined as

  


  AVFormatContext* ic
std::mutex mux;


  


  When I'm trying to call the Seek function and print out the frame index, it will be something like :

  


  //Read() is called:
0 0 21 42 40 ...
//Then Seek(0.9) is called, should have begin with a later frame, but it also returns me:
0 0 21 42 40 ...


  


• PHP ffmpeg exec returns null

  19 mars 2012, par benedict_w

  I'm trying to run ffmpeg through a PHP exec call, I've been debugging for a while and looked at lot of responses on here, but still not found any answers...

  My simplified call is :

  $cmd = 'ffmpeg 2>&1';
  
  
  
  exec(escapeshellcmd($cmd), $stdout, $stderr);
  
  
  
  var_dump($stderr);
  
  var_dump($stdout);
  
  var_dump($cmd);
  
  exit;

  My output is $stderr = int(1) and $stdout = array(0)

  Also I tried shell_exec($cmd) which returns NULL.

  cmd.exe has permissions set for the IUSR account - e.g. I can run $cmd = 'dir' and see a directory listing output.

  PHP is not running in safe mode.

  The ffmpeg.exe is in the same directory as my php file, but I have the same response giving an absolute path to the ffmpeg.exe file in $cmd.

  ffmpeg is executing fine from the command line.

  I'm running Windows XP, IIS and PHP 5.3.

  EDIT :

  If I run 'ffmpeg -h' I get the help commands, which must indicated that ffmpeg is recognised

  I've increased the PHP memory limit to 1024 - no luck.

• src/flac/utils.c : Make sure get_console_width() returns value > 0.

  8 juillet 2014, par Erik de Castro Lopo

  src/flac/utils.c : Make sure get_console_width() returns value > 0.
  Previous version of get_console_width() may return 0 which will result in
  
  a division by 0 in stats_print_name() :
  	console_width = get_console_width() ;
  
  	len = strlen_console(name)+2 ;
  
  	console_chars_left = console_width  - (len % console_width) ;
  Bug-report : https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=739613
  
  Patch-from : lvqcl <lvqcl.mail@gmail.com>
  

  • [DH] src/flac/utils.c