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• How to create a clip from an mp4-file quickly ?

  26 mars 2023, par Moritz Groß

  I have a web app that lets users download a clip from a mp4-file specified before. Currently I use ffmpeg via python like this :

  


  os.system('ffmpeg -i original_video -ss {start} -t {duration} result_video')


  


  Processing 10 minutes of 720p video with this method also takes a few minutes (during the execution, ffmpeg displays speed=3x on average). Does this mean processing 10 minutes of video takes 3minutes & 20 seconds as I understand it ?

  


  Is this slow of a performance expected ? Can I improve it by using an other filetype than mp4 ?

  


• PHP upload video files to database

  13 janvier 2016, par Mick Jack

  I am working on a school project that let users upload video files to a server. Server will compress the video using ffmpeg and store the file in upload folder. Other users will be able to stream the uploaded videos.

  My question is how do i retrieve the video that ffmpeg generated and store the link in the database ?

  i am using this code but it only retrieve path of the original video.

  $filePath = dirname(__FILE__); 

  partial code of Upload.php

  $target_dir = "upload/"; //where you want to upload the files to
  
  $target_file = $target_dir.basename($_FILES['file']['name']);
  
  $fileType = pathinfo($target_file, PATHINFO_EXTENSION);
  
  $newFileName = $target_dir.sha1(pathinfo(basename($_FILES['file']['name']), PATHINFO_FILENAME)).'-'.time().'.'.$fileType;
  
  move_uploaded_file($_FILES['file']['tmp_name'], $newFileName);
  
  $unique_id = rand(1000000,9999999);
  
  
  
  shell_exec("C:\\ffmpeg\\bin\\ffmpeg.exe -i ".$newFileName." -vcodec libx264 -crf 20 \"upload\\{$newFileName}\" > logfile.txt 2>&1");
  
  
  
  /// save information into database
  
                  $username = "root";
  
                  $password = "";
  
                  $hostname = "localhost"; 
  
                  $dbname = "test_database";
  
  
  
                  //connect to the database
  
                  $dbc = mysqli_connect($hostname, $username, $password, $dbname) or die ("could not connect to the database");
  
  
  
                  //execute the SQL query and return records
  
                   $result = mysqli_query($dbc, "INSERT INTO `viewvideo` (`vID`, 'video_id`, `video_link`) VALUES ('', '".$unique_id."', '".$newFileName."')");
  
  
  
                  if(!$result){echo mysqli_error($dbc); }
  
  
  
                  echo $result;
  
  
  
              /*  
  
                  declare in the order variable
  
                  $result = mysqli_query($dbc, $sql); //order executes
  
                  if($result){
  
                      echo("<br />Input data is succeed");
  
                  } else{
  
                      echo("<br />Input data is fail");
  
                  }
  
              */  
  
  
  
                  //close the connection
  
                  mysqli_close($dbc);

  output
  

• doc : delete viterbi.txt

  10 novembre 2013, par Timothy Gu

  doc : delete viterbi.txt
  The description has been moved to the FFmpeg wiki :
  
  https://trac.ffmpeg.org/wiki/ViterbiAlgorithm
  Signed-off-by : Timothy Gu <timothygu99@gmail.com>
  

  • [DH] doc/viterbi.txt