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• Pipe output of ffmpeg using nodejs stdout

  21 mai 2014, par rughimire

  I am not being able to pipe the output of the ffmpeg over a stdout.

  Following are the block of code what I coded so far.

      var http = require('http')
  
      , fs = require('fs') 
  
      var child_process = require("child_process")
  
  
  
      http.createServer(function (req, res) {
  
      console.log("Request:", dump_req(req) , "\n")
  
  
  
      // path of the 
  
      var path = 'test-mp4.mp4'  //test-mp4-long.mp4
  
      , stat = fs.statSync(path)
  
      , total = stat.size
  
  
  
  
  
      var range = req.headers.range
  
      , parts = range.replace(/bytes=/, "").split("-")
  
      , partialstart = parts[0]
  
      , partialend = parts[1]
  
      , start = parseInt(partialstart, 10)
  
      , end = partialend ? parseInt(partialend, 10) : total-1
  
      , chunksize = (end-start)+1
  
  
  
  
  
      console.log('RANGE: ' + start + ' - ' + end + ' = ' + chunksize +  "\n")
  
  
  
  
  
      var ffmpeg = child_process.spawn("ffmpeg",[
  
              "-i", path,             // path
  
              "-b:v" , "64k",         // bitrate to 64k
  
              "-bufsize", "64k", 
  
              "-"                     // Output to STDOUT
  
          ]);
  
  
  
  
  
      //set header
  
      res.writeHead(206
  
      , { 'Content-Range': 'bytes ' + start + '-' + end + '/' + total
  
      , 'Accept-Ranges': 'bytes', 'Content-Length': chunksize
  
      , 'Content-Type': 'video/mp4'
  
      })
  
  
  
      stdout[ params[1] ] = ffmpeg.stdout
  
  
  
      // Pipe the video output to the client response
  
      ffmpeg.stdout.pipe(res);
  
  
  
      console.log("Response", dump_res(res), "\n")
  
      }).listen(1337)

  When i replaced the ffmpeg stuffs from above code, all works fine. Following is the part of the code when i replace the ffmpeg stuffs.

   var file = fs.createReadStream(path, {start: start, end: end})

  And piping like :

  file.pipe(res)

  What wrong I am running ?

  Edit :
  The ffmpeg command works fine. I have tested this through the command line and generating proper output.

• FFmpeg file conversion exceeds maximum execution time

  5 mai 2014, par Paul Ledger

  I have a file upload system the checks the file format, etc and converts to an mp4 if necessary. This works fine as long as the video file(s) total length is less than 30 seconds.
  I have been testing this two short clips about 10 seconds each and it work fine but when I test this with a clip that this 33 seconds I get the error :

  Fatal error : Maximum execution time of 30 seconds exceeded in
  C :\xampp\htdocs\own_it_all\global.func\file_upload.php on line
  59
  

  I could just increase the maximum execution time in the php.ini file but as the max length of a video is 20 mins this wouldn’t seem very user friendly making the user wait 20 mins per video.
  Is there a way of converting the video instantly or as near as ?

  This is the exec cmd i have :

  $cmd = "ffmpeg -i $input -vcodec h264 -acodec aac -strict -2 $o";

  As the up-loader allows multiple uploads this is inside a for loop.

  foreach($_FILES['file']['name'] as $key => $name){
  
          if($_FILES['file']['error'][$key] === 0){
  
              $temp = $_FILES['file']['tmp_name'][$key];
  
              $ext = explode('.',$name);
  
              $ext = strtolower(end($ext));
  
              $_file = md5($temp).time();
  
              $file = $_file.'.'.$ext;
  
              if(in_array($ext,$allowed) === true &&  move_uploaded_file($temp,"../uploads/{$file}") === true){
  
                  $file_type = explode('/',$_FILES['file']['type'][$key]);
  
                  if($file_type[0] === 'image'){
  
                      $succedeed[] = array('name' => $name,'file' => $file, 'type' => 'image');               
  
                  }else{
  
                      $ffmpeg = 'ffmpeg';
  
                      $output = dirname(__DIR__).'/uploads/thumbs/'.$_file.'.jpg';
  
                      $input = dirname(__DIR__).'/uploads/'.$file;
  
                      $mov = new ffmpeg_movie($input);
  
                      $d =  $mov->getDuration();
  
                      $iscopy = $mov->getCopyright();
  
                      $h = $mov->getFrameHeight();
  
                      $w = $mov->getFrameWidth();
  
                      $pos = ceil((int)$d /3);
  
                      $size = $w.'x'.$h;
  
                      $i = explode('.',$input);
  
                      $o = $i[0].'.mp4';
  
                      if(ceil($d) < 1200){
  
                          if($ext != 'mp4'){
  
                              $cmd = "ffmpeg -i $input -vcodec h264 -acodec aac -strict -2 $o";
  
                              //$cmd = "ffmpeg -i $input -vcodec h264 -acodec aac -s $size $o";
  
                              shell_exec($cmd);
  
                              $toclear[] = array('file' => $file);
  
                          }
  
                          $cmd = "ffmpeg -ss $pos -i $o -an -s $size $output";
  
                          shell_exec($cmd);
  
                          $total_time += $pos;
  
                          $succedeed[] = array('name' => $name,'file' => 'thumbs/'.$_file.'.jpg', 'type' => 'mp4');                           
  
  
  
                      }else{
  
                          $failed[] = array('name' => $name, 'file' => $file, 'error' => 'Video length cannot exceed 20mins.');
  
                      }           
  
                  }
  
  
  
              }else{
  
                  $failed[] = array('name' => $name, 'file' => $file, 'error' => 'File type not allowed');
  
              }
  
          }
  
      }

• I have a series of images recorded by a webcam with unstable frame rate at about 22 fps. Did ffmpeg interpolate these image into other fps ? [closed]

  13 septembre 2020, par yangze68

  I have a series of images and its recorded timestamps. Their real fps is about 22 and it's unstable. If I use the FFmpeg to encode it into a 30fps video, do these really change the fps and interpolate image at an interval of 1/30 per second ? or Just arrange those images in the interval of 1/30 and decrease the total duration time ?

  


  my command :
ffmpeg -framerate 30 -i img%03d.png output.mp4