Recherche avancée

Sur d’autres sites (2270)

• aarch64 : vp9itxfm16 : Do a simpler half/quarter idct16/idct32 when possible

  25 février 2017, par Martin Storsjö

  aarch64 : vp9itxfm16 : Do a simpler half/quarter idct16/idct32 when possible
  This work is sponsored by, and copyright, Google.
  This avoids loading and calculating coefficients that we know will
  
  be zero, and avoids filling the temp buffer with zeros in places
  
  where we know the second pass won’t read.
  This gives a pretty substantial speedup for the smaller subpartitions.
  The code size increases from 21512 bytes to 31400 bytes.
  The idct16/32_end macros are moved above the individual functions ; the
  
  instructions themselves are unchanged, but since new functions are added
  
  at the same place where the code is moved from, the diff looks rather
  
  messy.
  Before :
  
  vp9_inv_dct_dct_16x16_sub1_add_10_neon :     284.6
  
  vp9_inv_dct_dct_16x16_sub2_add_10_neon :    1902.7
  
  vp9_inv_dct_dct_16x16_sub4_add_10_neon :    1903.0
  
  vp9_inv_dct_dct_16x16_sub8_add_10_neon :    2201.1
  
  vp9_inv_dct_dct_16x16_sub12_add_10_neon :   2510.0
  
  vp9_inv_dct_dct_16x16_sub16_add_10_neon :   2821.3
  
  vp9_inv_dct_dct_32x32_sub1_add_10_neon :    1011.6
  
  vp9_inv_dct_dct_32x32_sub2_add_10_neon :    9716.5
  
  vp9_inv_dct_dct_32x32_sub4_add_10_neon :    9704.9
  
  vp9_inv_dct_dct_32x32_sub8_add_10_neon :   10641.7
  
  vp9_inv_dct_dct_32x32_sub12_add_10_neon :  11555.7
  
  vp9_inv_dct_dct_32x32_sub16_add_10_neon :  12499.8
  
  vp9_inv_dct_dct_32x32_sub20_add_10_neon :  13403.7
  
  vp9_inv_dct_dct_32x32_sub24_add_10_neon :  14335.8
  
  vp9_inv_dct_dct_32x32_sub28_add_10_neon :  15253.6
  
  vp9_inv_dct_dct_32x32_sub32_add_10_neon :  16179.5
  After :
  
  vp9_inv_dct_dct_16x16_sub1_add_10_neon :     282.8
  
  vp9_inv_dct_dct_16x16_sub2_add_10_neon :    1142.4
  
  vp9_inv_dct_dct_16x16_sub4_add_10_neon :    1139.0
  
  vp9_inv_dct_dct_16x16_sub8_add_10_neon :    1772.9
  
  vp9_inv_dct_dct_16x16_sub12_add_10_neon :   2515.2
  
  vp9_inv_dct_dct_16x16_sub16_add_10_neon :   2823.5
  
  vp9_inv_dct_dct_32x32_sub1_add_10_neon :    1012.7
  
  vp9_inv_dct_dct_32x32_sub2_add_10_neon :    6944.4
  
  vp9_inv_dct_dct_32x32_sub4_add_10_neon :    6944.2
  
  vp9_inv_dct_dct_32x32_sub8_add_10_neon :    7609.8
  
  vp9_inv_dct_dct_32x32_sub12_add_10_neon :   9953.4
  
  vp9_inv_dct_dct_32x32_sub16_add_10_neon :  10770.1
  
  vp9_inv_dct_dct_32x32_sub20_add_10_neon :  13418.8
  
  vp9_inv_dct_dct_32x32_sub24_add_10_neon :  14330.7
  
  vp9_inv_dct_dct_32x32_sub28_add_10_neon :  15257.1
  
  vp9_inv_dct_dct_32x32_sub32_add_10_neon :  16190.6
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavcodec/aarch64/vp9itxfm_16bpp_neon.S

• Revision e890c2579b : add a context tree structure to encoder This patch sets up a quad_tree structur

  17 avril 2014, par Jim Bankoski

  Changed Paths :
   Modify /vp9/encoder/vp9_block.h

  
   Add /vp9/encoder/vp9_context_tree.c

  
   Add /vp9/encoder/vp9_context_tree.h

  
   Modify /vp9/encoder/vp9_encodeframe.c

  
   Modify /vp9/encoder/vp9_firstpass.c

  
   Modify /vp9/encoder/vp9_onyx_if.c

  
   Modify /vp9/vp9cx.mk

  
  
  add a context tree structure to encoder

  This patch sets up a quad_tree structure (pc_tree) for holding all of
  pick_mode_context data we use at any square block size during encoding
  or picking modes. That includes contexts for 2 horizontal and 2 vertical
  splits, one none, and pointers to 4 sub pc_tree nodes corresponding
  to split. It also includes a pointer to the current chosen partitioning.

  This replaces code that held an index for every level in the pick
  modes array including : sb_index, mb_index,
  b_index, ab_index.

  These were used as stateful indexes that pointed to the current pick mode
  contexts you had at each level stored in the following arrays

  array ab4x4_context[][][],
  sb8x4_context[][][], sb4x8_context[][][], sb8x8_context[][][],
  sb8x16_context[][][], sb16x8_context[][][], mb_context[][], sb32x16[][],
  sb16x32[], sb32_context[], sb32x64_context[], sb64x32_context[],
  sb64_context

  and the partitioning that had been stored in the following :
  b_partitioning, mb_partitioning, sb_partitioning, and sb64_partitioning.

  Prior to this patch before doing an encode you had to set the appropriate
  index for your block size ( switch statement), update it ( up to 3
  lookups for the index array value) and then make your call into a recursive
  function at which point you'd have to call get_context which then
  had to do a switch statement based on the blocksize, and then up to 3
  lookups based upon the block size to find the context to use.

  With the new code the context for the block size is passed around directly
  avoiding the extraneous switch statements and multi dimensional array
  look ups that were listed above. At any level in the search all of the
  contexts are local to the pc_tree you are working on (in ?).

  In addition in most places code that used to call sub functions and
  then check if the block size was 4x4 and index was > 0 and return
  now don't preferring instead to call the right none function on the inside.

  Change-Id : I06e39318269d9af2ce37961b3f95e181b57f5ed9

• php rename of ffmpeg deleted/reduced my video files to 20Kb

  29 octobre 2018, par ax.falcon

  I’m not sure what I did but somehow when I ran my code it deleted my video files, that is, it reduced each video file to a mere 20-40Kb.

  I’m using a directory tree iterator to go through the selected folder and iterate all the files and subfolders in there, with commands for each. I’m only doing the files at this stage, and the code simply

  1. renames the video file so that it has no spaces in it’s name
  2. extracts a thumbnail using ffmpeg and places it in the videos directory
  3. inserts data in to database for displaying on a website.

  Now I was able to use it once, and it worked save for 2 video files that I had been using for testing. For some reason those files were deleted. I tried running it again and it deleted all the videos.

  What might be the problem ?

  $mysqli = new mysqli("localhost", "refit_2_admin", "asd123", "refit_2");
  
  if($mysqli->connect_error)
  
  {
  
      exit('Error db');
  
  }
  
  mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
  
  $mysqli->set_charset("utf8mb4");
  
  $_SESSION['mysqli'] = $mysqli;
  
  
  
  // DIRECTORY
  
  
  
  $dir = 'videos';
  
  
  
  $it = new RecursiveTreeIterator(new RecursiveDirectoryIterator($dir, RecursiveDirectoryIterator::SKIP_DOTS)); 
  
  foreach($it as $path => $branch)
  
  {
  
      if(is_dir($path)) // if is a directory
  
      {
  
          // echo something
  
      }
  
      if(is_file($path)) // if is a file
  
      {
  
          $schism = pathinfo($path);
  
          $string = str_replace(' ', '_', $schism['filename']);
  
  
  
          //$string = str_replace($replace, $with, $string);
  
          rename($path, $dir.'\\'.$string.'.mp4');
  
  
  
          $ffmpeg = 'ffmpeg.exe';
  
  
  
          $video = dirname(__FILE__) . '\\'.$dir.'\\'.$string.'.mp4';
  
          //echo ''.$video.'<br />';
  
  
  
          $image = dirname(__FILE__) . '\\'.$dir.'\\'.$string.'.jpg';
  
          //echo ''.$image.'<br />';
  
  
  
          $second = 1;
  
  
  
          /*$cmd = "$ffmpeg -i $video 2>&amp;1";
  
          if (preg_match('/Duration: ((\d+):(\d+):(\d+))/s', `$cmd`, $time)) {
  
              $total = ($time[2] * 3600) + ($time[3] * 60) + $time[4];
  
              $second = rand(1, ($total - 1));
  
          }*/
  
  
  
          $cmd = "$ffmpeg -i $video -deinterlace -an -ss $second -t 00:00:01 -r 1 -y -vcodec mjpeg -f mjpeg $image 2>&amp;1";
  
          $return = `$cmd`;
  
  
  
          $video_title = substr($schism['filename'], 0, -5);
  
          $video_filename = $schism['filename'].'.mp4';
  
          $video_thumbnail = $schism['filename'].'.jpg';
  
          $video_include = basename(__DIR__);
  
          // Insert
  
          $stmt = $mysqli->prepare("INSERT INTO videos (video_title, video_filename, video_include, video_tags, video_thumbnail) VALUES (?, ?, ?, ?, ?)");
  
          $stmt->bind_param("sssss", $video_title, $video_filename, $dir, $video_title, $video_thumbnail);
  
          $stmt->execute();
  
          $stmt->close();
  
      }
  
  
  
  }