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• Resume encoding or re-encoding video after a power loss in ffmpeg

  23 juin 2016, par Bhupendra Pandey

  I have a php script that reads from database and converts videos using ffmpeg.

  Sometimes the power goes off and my server turns of suddenly.

  What should I do to re-encode the video that was being converted while the power loss occurred ?

  The whole process should be automatic.

• avcodec/ppc/h264dsp : POWER LE support in h264_idct_dc_add_internal() fix vec_lvsl bug

  14 mai 2015, par Rong Yan

  avcodec/ppc/h264dsp : POWER LE support in h264_idct_dc_add_internal() fix vec_lvsl bug
  We got defective video when use GCC 4.9.2 instead of GCC 4.9.1 to compile FFMEPG. And further found
  
  that GCC 4.8 and 4.9 need patch to fix the lvsl/lvsr bug on POWER LE, and GCC 5.1 contains
  
  the correct code since its release. The message on gcc-patches requesting approval for lvsl/lvsr
  
  patch is at https://gcc.gnu.org/ml/gcc-patches/2014-10/msg00228.html.
  The fixed code avoids using lvsl and will not depends on GCC version, also it uses less instructions on POWER LE.
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/ppc/h264dsp.c

• ffmpeg - Encoding Percentage in PHP

  13 juillet 2012, par Jimbo

  I've written a whole system in PHP and bash on the server to convert and stream videos in HTML5 on my VPS. The conversion is done by ffmpeg in the background and the contents is output to block.txt.

  Having looked at the following posts :

  Can ffmpeg show a progress bar ?

  and

  ffmpeg video encoding progress bar

  amongst others, I can't find a working example.

  I have always struggled with the regexes and maths, and I need to grab the currently encoded progress as a percentage.

  The first post I linked above gives :

  $log = @file_get_contents('block.txt');
  
  
  
  preg_match("/Duration:([^,]+)/", $log, $matches);
  
  list($hours,$minutes,$seconds,$mili) = split(":",$matches[1]);
  
  $seconds = (($hours * 3600) + ($minutes * 60) + $seconds);
  
  $seconds = round($seconds);
  
  
  
  $page = join("",file("$txt"));
  
  $kw = explode("time=", $page);
  
  $last = array_pop($kw);
  
  $values = explode(' ', $last);
  
  $curTime = round($values[0]);
  
  $percent_extracted = round((($curTime * 100)/($seconds)));
  
  
  
  echo $percent_extracted;

  The $percent_extracted variable echoes zero, and as maths is not my strong point, I really don't know how to progress here.

  Here's one line from the ffmpeg output from block.txt (if it's helpful)

  time=00:19:25.16 bitrate= 823.0kbits/s frame=27963 fps= 7 q=0.0 size=
  117085kB time=00:19:25.33 bitrate= 823.1kbits/s frame=27967 fps= 7
  q=0.0 size= 117085kB time=00:19:25.49 bitrate= 823.0kbits/s
  frame=27971 fps= 7 q=0.0 size= 117126kB

  Please help me output this percentage, once done I can create my own progress bar. Thanks.