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• php ffmpeg thumbnail size won't work

  26 septembre 2017, par Rtra

  In my code I am trying to generate a thumbnail in fixed size from a local hosted videos using ffmpeg but when I put my $default_size variable in command it won’t generate thumbnails I don’t know what I am doing wrong in it.

  Here is my PHP code

  <?php
  
  $default_size = '320x240';
  
  $result_generator = shell_exec("ffmpeg -i $video -deinterlace -an -ss $half -t $half -r 1 -y -vcodec mjpeg -f mjpeg $default_size $thumbnail 2>&1");
  
  if( ! $result_generator) {
  
  throw new Exception('Error creating video thumbnail');
  
  }
  
  print $result_generator . "\n\n";
  
  ?>

• ffmpeg How does the blend filter work

  8 juin 2018, par tainguyen

  I have small project which uses blend filter of FFmpeg library.

  I read the examples of this document
  https://ffmpeg.org/ffmpeg-filters.html#blend_002c-tblend

  But I’m not clearly understand about it.

  X, Y : the coordinates of the current sample

  W, H : the width and height of currently filtered plane

  What are the sample and filtered plane ?
  Is there any document about these things.

• h264 : make slice threading work with deblocking_filter=1

  13 avril 2016, par Anton Khirnov

  h264 : make slice threading work with deblocking_filter=1
  In such a case, decode the MBs in parallel without the loop filter, then
  
  execute the filter serially.
  The ref2frm array was previously moved to H264SliceContext. That was
  
  incorrect, since it applies to all the slices and should properly be in
  
  H264Context (it did not actually break decoding, since this distinction
  
  only becomes relevant with slice threading and deblocking_filter=1,
  
  which was not implemented before this commit). The ref2frm array is thus
  
  moved back to H264Context.
  

  • [DBH] libavcodec/h264.c
  • [DBH] libavcodec/h264.h
  • [DBH] libavcodec/h264_slice.c