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• 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

• 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.

• How to write v4l2 application with vivid (virtual video driver) for capturing video ?

  8 janvier 2016, par ransh

  I am trying to understand how to write v4l2 application.
  There is very well example in http://linuxtv.org/downloads/v4l-dvb-apis/capture-example.html , so I wanted to try to use it for capturing video with vivid (virtual device driver).

  I tried several resolution, pixelformat, different inputs,
  but on trying to display the captured file, it always has a sync problems ( the test bars of the video are keep moving in the horizontal axis).
  I tried to change resolution, pixelformat, in both capture application or player , but nothing helps.

  I compiled the v4l2 API example AS-IS from :
  http://linuxtv.org/downloads/v4l-dvb-apis/capture-example.html
  with minor modification in the —force part of the example (I also tried the example as is without modifications but it did not help), so that I choose hd input , and 1920x1080 resolution, V4L2_PIX_FMT_YUV420 (also tried V4L2_PIX_FMT_YUV422P) , progressive.

    if (force_format) {
  
              input = 3;  // <<-- HD input device
  
              if (-1==xioctl(fd,VIDIOC_S_INPUT,&input))
  
              {
  
               errno_exit("VIDIOC_S_INPUT");
  
              }
  
              fmt.fmt.pix.width       = 1920;
  
              fmt.fmt.pix.height      = 1080;
  
              fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUV420; // <<- tried also V4L2_PIX_FMT_YUV422P
  
              fmt.fmt.pix.field       = V4L2_FIELD_NONE; // <- trying to capture progressive
  
  
  
              if (-1 == xioctl(fd, VIDIOC_S_FMT, &fmt))
  
                      errno_exit("VIDIOC_S_FMT");
  
  
  
      } else {

  I run the application with (the compiled code using pixelformat = V4L2_PIX_FMT_YUV420 trial ) :

  ./v4l2_example -f -o -c 10  > cap_yuv420p.yuv 

  And (the compiled code using pixelformat = V4L2_PIX_FMT_YUV422P trial )

  ./v4l2_example -f -o -c 10  > cap_yuv422p.yuv 

  I’ve tried to play them with :

  ffplay -f rawvideo -pixel_format yuv420p -video_size 1920x1080 -i cap_yuv420p.yuv 

  And

  ffplay -f rawvideo -pixel_format yuv422p -video_size 1920x1080 -i cap_yuv422p.yuv 

  These are the captured video files from my above trials :

  https://drive.google.com/folderview?id=0B22GsWueReZTUS1tSHBraTAyZ00&usp=sharing

  I probably am doing something wrong.
  Is there any idea what’s wrong in my configurations or how I can debug it better ?