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• Remove all instances of first frame from mp4 in FFmpeg

  15 juin 2020, par Pete

  I have a frame occurring several times at the beginning of an MP4 and I'd like to get rid of the duplicate frames, such that it only occurs once.

  



  I know that the ffmpeg -i input.mp4 -vf mpdecimate,setpts=N/FRAME_RATE/TB out.mp4 command will remove duplicates in the entire video, but is there any way to limit this to frames identical to the first one ?

  


• Generating random thumbnails with PHP+FFMPEG

  30 décembre 2014, par MrGhost

  I’m trying to generate thumbnails from random points in a movie using FFMPEG and FFMPEG-PHP extension.

  My script works OK.. however takes 20 minutes just to generate 5-10 thumbnails !!

  The script works by generating random numbers which are used as frame numbers later. All numbers generated are within the movies frame count.

  Can you work out why this script is taking 20 mins to finish ?
  If not, a better solution ?

  <?php
  
  
  
  //Dont' timeout
  
  set_time_limit(0);
  
  
  
  //Load the file (This can be any file - still takes ages) 
  
  $mov = new ffmpeg_movie('1486460.mp4');
  
  
  
  //Get the total frames within the movie
  
  $total_frames = $mov->getFrameCount();
  
  
  
  //Loop 5-10 times to generate random frames 5-10 times
  
  for ($i = 1; $i <= 5; ) {
  
      // Generate a number within 200 and the total number of frames.
  
   $frame = mt_rand(200,$total_frames);
  
   $getframe = $mov->getFrame($frame);
  
   // Check if the frame exists within the movie
  
   // If it does, place the frame number inside an array and break the current loop
  
   if($getframe){
  
    $frames[$frame] = $getframe ;
  
    $i++;
  
   }
  
  }
  
  
  
  //For each frame found generate a thumbnail
  
  foreach ($frames as $key => $getframe) {
  
   $gd_image = $getframe->toGDImage();
  
   imagejpeg($gd_image, "images/shot_".$key.'.jpeg');
  
   imagedestroy($gd_image);
  
   echo $key.'<br />';
  
  }
  
  
  
  ?>

  The script SHOULD be generating frame numbers which are valid ? Anything within START - END should be valid frame numbers ? Yet the loop takes ages !

• timeshift Jumps in Live Streaming HLS Playback

  8 avril 2024, par matin

  some times in live streaming with hls (h264) client show a jump back in time shift
but index.m3u8 and playlist.m3u8 is ok and segments are correctly generated
I see this problem in our player and hls demo too
is there any thing related too transcoding and ffmpeg cause or prevent this problem