Recherche avancée

Sur d’autres sites (10567)

• Multiple video sources combined into one

  28 septembre 2011, par Oded

  I am looking for an efficient way to do the following :

  Using several source videos (of approximately the same length), I need to generate an output video that is composed of all of the original sources each running in its own area (like a bunch of PIPs in several different sizes). So, the end result is that all the original are running side-by-side, each in its own area/box.

  The source and output need to be flv and the platform I am using is Windows (dev on Windows 7 64bit, deployment to Windows server 2008).

  I have looked at avisynth but unfortunately it can't handle flv and non of the plugins and flv splitters I have tried worked.

  My current process uses ffmpeg in the following manner :

  1. Use ffmpeg to generate 25 png's per second per video, resizing the original as needed.
  2. Use the System.Drawing namespace to combine each set of frames into a new image, starting with a static background, then loading each frame into an Image and drawing to the background Graphics object - this gives me the combined frames.
  3. Use ffmpeg to combine the generated images to a video.

  All this is very IO intensive (which is my processing bottleneck at the moment) and I feel there must be a more efficient way to reach my goal. I do not have much experience with video processing, and don't know what options are out there.

  Can anyone suggest a more efficient way of processing these ?

• Increase ffmpeg precision for filters like SSIM, PSNR

  3 juin 2021, par Rashiq

  I am trying to calculate the ssim and psnr of an image using ffmpeg ; however, the results are only upto 2 decimal places. Is there a way to increase the precision of the results (higher the better) ?

  


  Output :

  


  n:1 mse_avg:0.00 mse_r:0.00 mse_g:0.00 mse_b:0.00 psnr_avg:76.89 psnr_r:76.88 psnr_g:76.93 psnr_b:76.86


  


  Command used for psnr :

  


  ffmpeg.exe -i original.tiff -i modified.tiff -lavfi psnr=stats_file=psnr_logfile.txt -f null -


  


  Command used for ssim :

  


  ffmpeg.exe -i original.tiff -i modified.tiff -lavfi ssim=stats_file=ssim_logfile.txt -f null -


  


• PHP Sort Order Proccess Codeiginiter

  20 avril 2015, par Alan El-nino Malmsteen

  i use php codeigniter to manage video using FFMPEG, but i dont know how to delete original video after convertion succesful.

  if(!($_FILES["upload_video"]["type"] == "video/mp4"))
  
      {
  
      $prename = $r.'.'.$ext;
  
      $video = $prename.'.mp4';
  
      $directory_path  = "/home/templates/videos/".$prename;
  
      $directory_path_full = "/home/templates/videos/".$prename;
  
      exec("ffmpeg -i ".$directory_path_full." ".$directory_path.".mp4"); 
  
  
  
      // Delete original format video
  
      $this->load->helper("file");
  
      unlink($directory_path_full); 
  
  
  
      }else{
  
      $video = $r.'.'.$ext;
  
      }

  When i use "unlink" it work good to delete file, but the video is corrupt (maybe php directly delete it when converting progress)
  So, can you help me to create sort order php process for this case ?

  Thanks