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• How do I get the last line of a popen() callback in every iteration ?

  29 mai 2017, par Mike

  I’m trying to create a progress bar with FFMPEG using php and AJAX. When a user uploads a video file I want to be able to display the current percent until completion. I have managed to get everything working but I have one issue.

  The data returns what I want, but it also returns all the data from the previous iterations... like it just keeps stacking everything on top rather than flushing out the data from previous iterations. I tried to work with tail thinking it would return only the last line, but it did not return anything.

  Here is the code I’m working with :

  encode.php

  $video_path = 'test.mp4';
  
  $cmd        = 'ffmpeg -i ' . $video_path .' -y -hide_banner output.mp4 2>&1';
  
  
  
  while (@ ob_end_flush());
  
  
  
  $proc = popen($cmd, 'r');
  
  
  
  while (!feof($proc))
  
  {
  
  
  
      $file = escapeshellarg(fread($proc, 4096));
  
      //$line = `tail -n 1 $file`; // <-tried this with no luck
  
      echo fread($file, 4096) . "\n";
  
      @ flush();
  
  }
  
  return 'complete';
  
  pclose($proc);

  The above code returns :

  // first iteration
  
  frame=   52 fps= 13 q=29.0 size=     279kB time=00:00:00.10 bitrate=22856.9kbits/s
  
  
  
  // second iteration
  
  frame=   52 fps= 13 q=29.0 size=     279kB time=00:00:00.10 bitrate=22856.9kbits/s    
  
  frame=   54 fps= 12 q=29.0 size=     329kB time=00:00:00.16 bitrate=16146.6kbits/s 
  
  
  
  // third iteration
  
  frame=   52 fps= 13 q=29.0 size=     279kB time=00:00:00.10 bitrate=22856.9kbits/s    
  
  frame=   54 fps= 12 q=29.0 size=     329kB time=00:00:00.16 bitrate=16146.6kbits/s    
  
  frame=   57 fps= 11 q=29.0 size=     464kB time=00:00:00.26 bitrate=14233.2kbits/s 

  As you can see the data stacks, I need only the new line of data, not the data stacking.

  ** EDIT ** this has been marked as a duplicate, rather than me explain how it’s different, I’d like to hear how this is the same thing ? I am not writing to a log file and, like most people, do not feel that’s a good solution.

• avutil/hwcontext_d3d11va : fix type arguments passed to IDXGIAdapter2_GetDesc()

  24 juillet 2018, par James Almer

  avutil/hwcontext_d3d11va : fix type arguments passed to IDXGIAdapter2_GetDesc()
  libavutil/hwcontext_d3d11va.c : In function 'd3d11va_device_create' :
  
  libavutil/hwcontext_d3d11va.c:554:46 : warning : passing argument 2 of 'pAdapter->lpVtbl->GetDesc' from incompatible pointer type [-Wincompatible-pointer-types]
  
           hr = IDXGIAdapter2_GetDesc(pAdapter, &desc) ;
  
                                                ^
  
  libavutil/hwcontext_d3d11va.c:554:46 : note : expected 'DXGI_ADAPTER_DESC * aka struct DXGI_ADAPTER_DESC *' but argument is of type 'DXGI_ADAPTER_DESC2 * aka struct DXGI_ADAPTER_DESC2 *'
  Reviewed-by : Jean-Baptiste Kempf <jb@videolan.org>
  
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavutil/hwcontext_d3d11va.c

• avfilter/delogo : Check that logo area is inside the picture

  10 mai 2016, par Jean Delvare

  avfilter/delogo : Check that logo area is inside the picture
  We can only remove the logo if it is inside the picture. We need at
  
  least one pixel around the logo area for interpolation.
  Fixes ticket #5527 (Delogo crash with x=0 and/or y=0).
  Signed-off-by : Jean Delvare <jdelvare@suse.com>
  
  Reviewed-by : Paul B Mahol <onemda@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavfilter/vf_delogo.c