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• FFMPEG MP4 conversion takes so long its not practical

  30 avril 2018, par Chrisco420365

  I want to start out by saying that I’m not just stating the fact that FFMPEG to MP4 conversion is so slow, but I’m hoping someone here can help me with this as I’ve searched around and haven’t really found out what to do in order to fix my problem.

  So I found a script that seems to do the job for me, it inputs several video file formats and will in turn convert to MP4 which I will later allow the web user to watch online.

  Two main things are done in this script by FFMPEG, a still image is captured in .jpg format and the video is converted to MP4. After some tweaking the script seems to work but at first I thought that it wasn’t working, that it was simply halting my server.

  Let me back up for a minute... I am using FFMPEG on my development server, which is really just my crappy laptop with XAMPP installed on Windows 10 and only 2GB of RAM. Once I have the site working perfectly I will move from my crappy laptop development environment to probably a entry level dedicated server hosting plan from Godaddy or other, since at first I expect the traffic to my website to be very low.

  The problem I am having is I am testing out the script that I will show you, and even with a 10MB video, it takes over 2 minutes to finish. Meanwhile the upload progress bar shows 100% since the upload is in fact complete, but no message for the user to know that something is going on behind the scenes. Obviously that I can figure out how to fix myself, maybe even just put a message letting them know that it will be a few minutes. When I tried a video that is 120MB, it took over 5 minutes which means I had to not only modify my php.ini file to allow for such script execution times, but it also makes it so that I can do nothing on the website while this is happening.

  Not only can I not even so much as scroll the page up or down, but if I try to open another tab and load my website it just sits there with a blank screen as if its trying to access my site. Obviously it’s because FFMPEG is using up all system resources during its conversion of the video file. If I open file explorer and click once on the video file that is being created, and continue clicking once on it I’ll see the file size of this file slowly get larger and larger, which is obvious since the file is being filled. This problem of course is with no users on it other than myself since its in its development stage, so I wonder what it will be like on a dedicated server with users online. Will the other users not be able to do anything for however many minutes until whoever is uploading a video has their video finished ?

  Should it be necessary for me to increase the max execution time in the php.ini file to more than 5 minutes for a 120MB file ? What will happen if a user tries to upload a file larger than 120MB ? Should I cut them off at 500MB perhaps ?

  I love the fact that my users will be able to upload videos and I can get thumbnails and even convert to MP4 to display using HTML5 but not thrilled if noone, including the user uploading the video, can use the site as the system resources are pegged. The last time I uploaded a video on YouTube I think I remember a message saying that it would take several minutes to finish but I don’t remember the website just completely stopping for several minutes. Perhaps this is because I’m running on my insignificant laptop ?

  While searching for answers to this I did come across some people complaining about it being slow but didn’t find any solutions and in fact don’t think I saw people saying it completely locked up the website until finished. As I said, I’d hate for others not to be able to get to my website or be kicked off simply because someone is uploading a video.

  Perhaps this is a common issue that can be resolved with a powerful enough dedicated server once I move to production ? I would greatly appreciate any and all suggestions on how to resolve this so the user may at least continue using other areas of our website, while the conversion is taking place. I can send them an alert once the conversion is finished. If there are any suggestions as to a minimum dedicated server specs that would help alleviate this from happening, I am all ears ! :) Thanks !

  Here is the script that I’m currently using :

  <?php
  
  include_once($_SERVER['DOCUMENT_ROOT'].'/includes/dbc.php');
  
  // size input prevents buffer overrun exploits.
  
     function sizeinput($input, $len){
  
          (int)$len;
  
       (string)$input;
  
       $n = substr($input, 0,$len);
  
       $ret = trim($n);
  
       $out = htmlentities($ret, ENT_QUOTES);
  
       return $out;
  
  }
  
  
  
   //Check the file is of correct format.  
  
   function checkfile($input){
  
      $ext = array('mpg', 'wma', 'mov', 'flv', 'mp4', 'avi', 'qt', 'wmv', 'rm');
  
      $extfile = substr($input['name'],-4); 
  
      $extfile = explode('.',$extfile);
  
      $good = array();
  
      $extfile = $extfile[1];
  
      if(in_array($extfile, $ext)){
  
            $good['safe'] = true;
  
           $good['ext'] = $extfile;
  
      }else{
  
            $good['safe'] = false;
  
     }
  
       return $good;
  
   }
  
  
  
   $user_id = $_SESSION['user_id'];
  
   // if the form was submitted process request if there is a file for uploading
  
   if($_POST && array_key_exists("vid_file", $_FILES)){
  
                             //$uploaddir is for videos before conversion
  
                            $uploaddir = 'temp/';
  
                             //$live_dir is for videos after converted to flv
  
          $live_dir = 'library/';
  
                              //$live_img is for the first frame thumbs.
  
          $live_img = 'thumbs/';      
  
                             $seed = time();       
  
          $upload = $seed;
  
          $uploadfile = 'temp/'.$upload.'.mp4';        
  
          $vid_title = sizeinput($_POST['vidTitle'], 50);
  
          $vid_title = sanitizeString($vid_title);
  
          $vid_desc = sizeinput($_POST['vidDesc'], 2000);
  
          $vid_desc = sanitizeString($vid_desc);
  
          $vid_cat = (int)$_POST['vidCat'];
  
          $safe_file = checkfile($_FILES['vid_file']);
  
          if($safe_file['safe'] == 1){
  
              if (move_uploaded_file($_FILES['vid_file']['tmp_name'], 'temp/'.$upload.'.mp4')) {
  
                     echo "File was successfully uploaded.<br />";
  
                      //$base = basename($uploadfile, $safe_file['ext']);
  
                      $new_file = $seed.'.mp4';
  
                      $new_image = $seed.'.jpg';
  
                      $new_image_path = "thumbs/".$seed.'.jpg';
  
                      $new_flv = "library/".$new_file;
  
                      //exec('ffmpeg -i '.$uploadfile.' -an -ss 00:00:01-r 1 -vframes 1 -f mjpeg -y '.$new_image_path);
  
                      exec('ffmpeg  -i '.$uploadfile.' -f mjpeg -vframes 1 -s 300x300 -an '.$new_image_path.'');
  
                      //ececute ffmpeg generate flv
  
                        exec('ffmpeg -i '.$uploadfile.' -f mp4 '.$new_flv);
  
                         //execute ffmpeg and create thumb
  
  
  
  
  
              echo 'Thank You For Your Video!<br />';
  
                         //create query to store video
  
  
  
          $sql = "INSERT INTO videos (`user_id`, `title`,`desc`, `file`, `thumb`) VALUES('".$user_id."','".$vid_title."','".$vid_desc."','".$new_file."','".$new_image."')";
  
  
  
  
  
                      echo '<img src="http://stackoverflow.com/feeds/tag/&#039;.$new_image_path.&#039;" style='max-width: 300px; max-height: 300px' /><br />
  
                            <h3>'.$vid_title.'</h3>';
  
                      mysqli_query($link, $sql) or die(mysqli_error($mysql));
  
               } else {
  
                      echo "Possible file upload attack!\n";
  
                      print_r($_FILES);
  
               }
  
  
  
          }else{
  
  
  
               echo 'Invalid File Type Please Try Again. You file must be of type 
  
               .mpg, .wma, .mov, .flv, .mp4, .avi, .qt, .wmv, .rm';
  
  
  
          }
  
   }
  
   ?>

• Rendering a remote raw h264 video stream in javascript using WebRTC [on hold]

  20 mai 2018, par Shahabi

  I’m new in Video streaming and decoding for rendering on Web Browser.
  My plan is to create a raw h264 stream on localhost environment and in Nodejs application, I want to read the raw h264 stream and render it on Web browser with Low latency.

  For creating a stream, I’m using VLC Stream option in h264 format on HTTP server. I’m using my laptop webcam and mic for streaming audio/video on localhost environment.

  Now I’m stuck on getting that stream on web page and render it on Web browser.
  I want to use WebRTC or any other opensource library for fast rendering.

  Anyone know or guide me into the right direction where i can solve my problem as mention above ?

  Thanks

• ffmpeg live webcam colorkey subtraction and dispaly feed on desktop (with subtracted color transparent/desktop see through visible))

  26 mai 2018, par Vij

  Purpose : I want to create instructional video lectures using laptop webcam and presentation slides. Here I should be visible in bottom right corner of desktop in small screen or full screen explaining slides. (like TV weather report).

  What I seek : Is there any way to apply colorkey to live webcam video to subtract background (greenscreen) so that desktop is visible through the top webcam borderless video window.(Then record everything on desktop)

  What I have done : I have been successful in overlaying colorkeyed live webcam video and X11grab :0.0 and saving the output in a video file.

      ffmpeg -f x11grab -thread_queue_size 64 -video_size 1024X600 -framerate 30 -i :0.0 -f  v4l2 -thread_queue_size 64 -video_size 320X180 -framerate 30 -i /dev/video0 -filter_complex '[1:v]colorkey=0x000000:0.1:0[ckout];[0:v][ckout] overlay=main_w-overlay_w:main_h-overlay_h:format=yuv444' -vcodec libx264 -preset ultrafast -qp 0 -pix_fmt yuv444p video.mp4

  But this is not I want. Because this way I cannot see what actually is happening on desktop and where should I point on the slide (lack of instructional control).

  I also successfully piped this composite output through ffplay - but it creates a mirror in mirror effect so thus useless.

  What I expect : I just want to apply ffmpge colorkey to the webcam feed /dev/video0 and display color subtracted output on desktop so that the subtracted region in the video player (ffplay/mplayer) should appear transparent and desktop should be visible (video player should preserve alpha channel and appear transparent in colorkeyed region). (weatherman effect).

  Roughly I am looking for
  ffmpeg -i /dev/video0 colorkry[ckout] -| ffplay -i - or - | mplayer -

  Note : I know openbroadcaster can do this job, I tried to install it but it does not execute citing "Failed to initialize video. Your GPU may not be supported, or your graphics drivers may need to be updated." I have a old laptop 2GB RAM and Atom processor running Xubuntu 16.04. probably openbroadcaster cant support.

  As I have successfully oberlayed colorkeyed webcam feed with X11grab (with maximum 50% cpu usage) I think it is easily possible to do live webcam colerkey subtraction with available resources.

  Please give suggestions.