Recherche avancée

Sur d’autres sites (14524)

• Making a blu-ray video-album from 30fps video-recordings ?

  11 janvier 2015, par mr_lou

  I wish to make a blu-ray video-album with all the family video-recordings I’ve done with various recording devices through-up the years. Most of the recordings are 720p 30fps, recorded with my cellphone.

  As many others before me I have now learned, that simply saving my video-project as a 720p 24fps rendering, results in a lot of jerkiness due to the missing frames. Not good.

  But what to do then ?

  According to http://en.wikipedia.org/wiki/Blu-ray_Disc#Media_format my other framerate options for 720p are 60fps (59.94fps) or 50fps. So as I’m writing this I’m trying to render my project into a 59.94fps video. Logically, if my recordings have 30fps, there’ll be a little jerkiness here too though ?

  Another option I seem to have, is to save my project as a 1080i 29.97fps video. This is as close to the 30fps I can get, but again : 29.97fps isn’t 30fps, so what happens with jerkiness here ?

  Also, saving my 720p 30fps recordings as either 720p 59.94fps or 1080i 29.97fps logically results in a bigger filesize. Filesize is somewhat important too, as I expect this blu-ray collection to contain as many videos as possible. (720p recordings should give at least 11 hours on a standard 25gb blu-ray disc).

  And finally, there’s also the theoretical option of converting my 30fps recordings to smooth 24fps recordings, but as far as I can understand in my searches, this is extremely tricky / almost impossible to do ?

  Surely it can’t be this tricky to put everyday recordings onto a blu-ray disc ? I must be missing something ?

  The overall question is : What is the best solution for putting 720p 30fps and 1080p 30fps video-recordings onto a blu-ray disc ?

  Thanks !

  EDIT :

  Two possible answers I’m expecting to hear :

  1) Best practice to put 720p 30fps and 1080p 30fps videos onto a blu-ray, is to just stick to 720p 30fps and 1080p 30fps. Although it is not a blu-ray standard, the majority of players will play them anyway.

  2) Best practice is to use 720p 59.94fps. That’s the only way to make sure the video plays on most devices. There are simply too many devices that will only play the blu-ray standards. So you can forget about using anything else.

• Improve ffmpeg performance

  8 décembre 2014, par hitesh

  I am using ffmpeg to take screen shot from video , it is video from CDN.

  I am doing below steps

  1.Upload video to CDN using html file tag.

  2.Get CDN url and use it for creating screen shot using ffmpeg.

  3.Upload the screenshot in CDN.

  4.Save video and screenshot CDN url to DB

  the whole process is really time consuming, even if I put loader it is really slow.

  This is code of POC I did for ffmpeg :

  $imageFile = realpath("./videos") . '/test5.png';
  
  $imageFile2 = realpath("./videos") . '/test6.png';
  
  $size = "230x155";
  
  $getfromsecond = 8;
  
  
  
  if (isEnabled('shell_exec')) {
  
      echo "Shall_exec is enabled " . "<br />";
  
      shell_exec('echo "hello world"');
  
      echo "<br />";
  
  } else {
  
      echo "shall exec command is not allowed";
  
  }
  
  
  
  $cmd = "ffmpeg -i $vid -an -ss $getfromsecond -s $size -vframes 1 $imageFile";
  
  $cmd2 = "ffmpeg -i $remoteVideo -an -ss $getfromsecond -s $size -vframes 1 $imageFile2";
  
  
  
  echo 'command 1 - local Image : ' . $cmd . "<br />";
  
  echo 'command 2 - remote video : ' . $cmd2 . "<br />";
  
  echo "<br />command 2 - remote video shell_exec output : " . shell_exec($cmd) . "<br />";
  
  echo '<br />command 2 - remote video shell_exec output : ' . shell_exec($cmd2) . "<br />";
  
  
  
  if (!shell_exec($cmd)) {
  
      echo " video Thumbnail created" . "<br />";
  
  } else {
  
      echo "Error Creating video thumbnail" . "<br />";
  
  }
  
  if (!shell_exec($cmd2)) {
  
      echo "Remote video Thumbnail created" . "<br />";
  
  } else {
  
      echo "Error Creating Remote video thumbnail" . "<br />";
  
  }
  
  
  
  function isEnabled($func) {
  
      return is_callable($func) &amp;&amp; false === stripos(ini_get('disable_functions'), $func);
  
  }  

  Is there some way to improve ffmpeg performance ?

  Thanks

• Shall_exec() is not working in Cent OS 6.5 with php 5.5

  5 décembre 2014, par hitesh

  It is the follow up from the question here. I was not sure if it was good idea to edit that question, So I am asking a new question here

  As explained in my previous question I am using ffmpeg for getting screenshot from video.it seems to working fine in my local but in my Cent OS 6.5 server it is not working, it throws error that
  ffmpeg extension is not enabled.

  "Error in Loading ffmpeg"

  To debug this, I commented the line

    extension_loaded('ffmpeg') or die('Error in loading ffmpeg');

  and I found out that in Cent OS terminal, ffmpeg command were working but if I use it with full path as I am doing in windows it did not work.So i deleted full path and used ffmpeg alone, I am not sure what was the reason behind this.

  Here is my new command

    $cmd = "ffmpeg -i $vid -an -ss $getfromsecond -s $size -vframes 1 $imageFile";
  
      $cmd2 = "ffmpeg -i $remoteVideo -an -ss $getfromsecond -s $size -vframes 1 $imageFile2 ";
  
      echo $cmd ."<br />";
  
      echo $cmd2."<br />";
  
  exec($cmd, $output, $return);
  
  echo '$output :' ; print_r($output); echo "<br />";echo '$return' . $return . "<br />";
  
  
  
  if ($return != 0) {
  
      // an error occurred
  
      echo "Error in EXEC command ";
  
  }
  
  
  
  if(!shell_exec($cmd2)){
  
      echo "Remote video Thumbnail created". "<br />";
  
  }else{
  
      echo "Error Creating Remote video thumbnail". "<br />";
  
  }

  now again it was not working in server, but when I tried both command

   `     echo $cmd ."<br />";
  
  
  
          echo $cmd2."<br />";` 

  in dev terminal, it got executed successfully I could see the screenshot.

  So while searching for the problem, I found this question here based on this answer here. I understood that some server may not allow it so I checked it.

   if (isEnabled('shell_exec')) {
  
      echo "Shell_exec is enabled "."<br />";
  
      shell_exec('echo "hello world"');
  
      echo "<br />";
  
  }else{
  
  
  
      echo "shell exec command is not allowed";
  
  }

  I got the output "Shell_exec is enabled " but shell_exec('echo "hello world"'); does not seems to work, Also when I run the command directly in terminal it works.

  Help me find the issue here, is it issue with shall_exec() or something else ?

  Any help is appreciated. Thanks