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• avformat/matroskaenc : Stop reallocating of Cluster buffer

  29 décembre 2019, par Andreas Rheinhardt

  avformat/matroskaenc : Stop reallocating of Cluster buffer
  The Matroska muxer uses a dynamic buffer to buffer the content of
  
  Clusters before eventually writing them. Up until now, each time a
  
  Cluster was written, the dynamic buffer was closed, i.e. freed ; now it
  
  is only reset, saving allocations of the AVIOContext itself, its opaque
  
  as well as most of the reallocations of the buffer.
  This is advantageous performance-wise, in particular on systems where
  
  reallocations are slow (namely Windows). The following table shows the
  
  decicyles for writing a frame on Linux (Ubuntu 19.10) and Windows (7)
  
  on an x64 Haswell (to /dev/null on Linux, to stdout which is discarded
  
  on Windows (the default values of the size and duration of clusters for
  
  seekable output have been explicitly set in this case) ; in all tests,
  
  writing CRC-32 values has been disabled in all tests ; calls to the muxer's
  
  write_packet function in write_packet() in libavformat/mux.c have been
  
  timed ; each of the following tests has been repeated 50 times) :
      | Windows before | Windows after | Linux before | Linux after
  
   A  |     979437     |    192304     |    259500    |   183320
  
   B  |     715936     |    155648     |    152786    |   130879
  
   C  |     265115     |     56034     |     78496    |    53243
  
   D  |     386224     |     80307     |    128894    |    75354
  
   E  |      21732     |     10695     |     11320    |     9801
  (A is a 10.2 mb/s file with a GOP length of 2s, amounting to an average
  
  Cluster size of about 2.5 MiB ; the average Cluster size of B is 1.1 MiB ;
  
  for C it is 2.35 MiB, for D it is 0.46 MiB ; for E - a file with just a
  
  single audio track of 158kb/s resulting in a Cluster size of about 100
  
  kB, the relative gains were the smallest, probably because of the small
  
  Cluster size.)
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/matroskaenc.c

• fftools/ffmpeg_filter : stop accessing OutputStream.[max_]frame_rate

  12 septembre 2024, par Anton Khirnov

  fftools/ffmpeg_filter : stop accessing OutputStream.[max_]frame_rate
  Pass them to ofilter_bind_ost() via OutputFilterOptions, as is done for
  
  most other data it needs. OutputStream.[max_]frame_rate/force_fps are no
  
  longer used outside of ffmpeg_mux*, and so can be made private.
  This is a step toward decoupling encoders from muxers.
  

  • [DH] fftools/ffmpeg.h
  • [DH] fftools/ffmpeg_filter.c
  • [DH] fftools/ffmpeg_mux.h
  • [DH] fftools/ffmpeg_mux_init.c

• Jquery auto-refresh stop refreshing after 10seconds

  11 février 2016, par Mick Jack

  I have this JQuery script to auto refresh every 2seconds after a video is uploaded and retrieve the estimated time needed to process the video with ffmpeg

  However my refresh script stop refreshing after 10-15seconds. i traced the problem to the session_start() ; when i remove this session_start() ; my refresh script work perfectly. what could be the cause and solution here ?

  videoupload.php

  <div title="test">
  
          <h5>Encoding percentage</h5>
  
          <code class="echappe-js">&lt;script src=&quot;https://code.jquery.com/jquery-2.1.1.min.js&quot; type=&quot;text/javascript&quot;&gt;&lt;/script&gt;
                  
  &lt;script&gt;<br />
  
                  $(&quot;#Submit&quot;).click(function(event){<br />
  
                  setInterval(function(){<br />
  
                  $(&quot;#myDiv&quot;).load('progress.php')<br />
  
                  }, 2000);<br />
  
                  });<br />
  
                  &lt;/script&gt;
          

  Progress.php

  <?php
  
  
  
  $content = @file_get_contents('logfile.txt');
  
  
  
              if($content){
  
              //get duration of source
  
              preg_match("/Duration: (.*?), start:/", $content, $matches);
  
  
  
              $rawDuration = $matches[1];
  
  
  
              //rawDuration is in 00:00:00.00 format. This converts it to seconds.
  
              $ar = array_reverse(explode(":", $rawDuration));
  
              $duration = floatval($ar[0]);
  
              if (!empty($ar[1])) $duration += intval($ar[1]) * 60 ;
  
              if (!empty($ar[2])) $duration += intval($ar[2]) * 60 * 60 * 60;
  
  
  
              //get the time in the file that is already encoded
  
              preg_match_all("/time=(.*?) bitrate/", $content, $matches);
  
  
  
              $rawTime = array_pop($matches);
  
  
  
              //this is needed if there is more than one match
  
              if (is_array($rawTime)){$rawTime = array_pop($rawTime);}
  
  
  
              //rawTime is in 00:00:00.00 format. This converts it to seconds.
  
              $ar = array_reverse(explode(":", $rawTime));
  
              $time = floatval($ar[0]);
  
              if (!empty($ar[1])) $time += intval($ar[1]) * 60;
  
              if (!empty($ar[2])) $time += intval($ar[2]) * 60 * 60;
  
  
  
              //calculate the progress
  
              $progress = round(($time/$duration) * 100);
  
  
  
              echo "Duration: " . $duration . "<br />";
  
              echo "Current Time: " . $time . "<br />";
  
              echo "Progress: " . $progress . "%";
  
  
  
  }
  
  
  
  ?>

  upload.php

  session_start();
  
  
  
  $userID = $_SESSION['login_user'];
  
  // rest of the code to convert video using ffmpeg