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• catch percentage File conversion ffmpeg

  28 mai 2013, par offboard

  I've been thinking about implementing a new function on my system.
  so I thought to show the state of the file conversion.
  I thought of a logic to it.
  updating table from the database according to the percentage of file conversion.

  <?
  
  exec('ffmpeg -i p17prdvj251lk11d3v12ntijfq2u1.mp4 -vf scale=-1:360 -c:v libx264 -preset ultrafast output.flv');
  
  for($i = 0; $i <= 1; $i++){
  
      mysql_query("UPDATE progress SET pss='".$i."' WHERE id='1'");
  
  }

  the problem is that I do not know if it's possible to get the percentage.
  I thought about using the extension of ffmpeg and create a function to convert the files but do not know if it will work

• ffmpeg process creating files with wrong permissions

  24 janvier 2013, par Rickard Liljeberg

  So I am fiddling with asp.net and ffmpeg. I downloaded this sample here : http://nolovelust.com/post/Another-Simple-C-Wrapper-For-FFmpeg

  It all works perfectly on my local machine, but when i publish to my hosting I get the problem that it runs but thinks forever (literally). the weird thing is that the files are created but with permission 00 (according to filezilla) I cannot do anything to them except delete them.

  now even weirder is that after a long time they would get permission 777 sometimes and if i downloaded them and had a look it was all correct.

  So basically I am pretty sure it's this file permission thing that is the issue but I start ffmpeg like so : Process proc = System.Diagnostics.Process.Start(oInfo);

  so how can i control which filepermission ffmpeg in turn saves with ??

• PHP readfile on a file which is increasing in size

  13 février 2013, par Sathiya Sundaram

  Is it possible to use PHP readfile function on a remote file whose size is unknown and is increasing in size ? Here is the scenario :

  I'm developing a script which downloads a video from a third party website and simultaneously trans-codes the video into MP3 format. This MP3 is then transferred to the user via readfile.

  The query used for the above process is like this :

  wget -q -O- "VideoURLHere" | ffmpeg -i - "Output.mp3" > /dev/null 2>&1 &

  So the file is fetched and encoded at the same time.
  Now when the above process is in progress I begin sending the output mp3 to the user via readfile. The problem is that the encoding process takes some time and therefore depending on the users download speed readfile reaches an assumed EoF before the whole file is encoded, resulting in the user receiving partial content/incomplete files.

  My first attempt to fix this was to apply a speed limit on the users download, but this is not foolproof as the encoding time and speed vary with load and this still led to partial downloads.

  So is there a way to implement this system in such a way that I can serve the downloads simultaneously along with the encoding and also guarantee sending the complete file to the end user ?

  Any help is appreciated.

  EDIT :
  In response to Peter, I'm actually using fread(read readfile_chunked) :

   <?php
  
   function readfile_chunked($filename,$retbytes=true) {
  
              $chunksize = 1*(1024*1024); // how many bytes per chunk
  
              $totChunk = 0;
  
              $buffer = '';
  
              $cnt =0;
  
              $handle = fopen($filename, 'rb');
  
              if ($handle === false) {
  
                  return false;
  
              }
  
              while (!feof($handle)) {
  
                  //usleep(120000); //Used to impose an artificial speed limit
  
                  $buffer = fread($handle, $chunksize);
  
                  echo $buffer;
  
                  ob_flush();
  
                  flush();
  
                  if ($retbytes) {
  
                      $cnt += strlen($buffer);
  
                  }
  
              }
  
                  $status = fclose($handle);
  
              if ($retbytes && $status) {
  
                  return $cnt;        // return num. bytes delivered like readfile() does.
  
              }
  
              return $status;
  
          }
  
          readfile_chunked($linkToMp3);
  
      ?>

  This still does not guarantee complete downloads as depending on the users download speed and the encoding speed, the EOF() may be reached prematurely.

  Also in response to theJeztah's comment, I'm trying to achieve this without having to make the user wait..so that's not an option.