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• Ghosting in colour channels

  24 mai 2024, par Blikpils

  This seems like a very specific question so i hope there is someone who can help me out.
Within FFMPEG i am trying to add (channel pack) 3 different grayscale videos in RGB within a webm or mp4 video. I got it to work to a degree via Merge planes.
This is what i tried :

  


  ffmpeg -y -i video1.webm -i video2.webm -i video3.webm -filter_complex "[0:v]format=gray[r]; [1:v]format=gray[g]; [2:v]format=gray[b]; [g][b][r]mergeplanes=0x001020:format=gbrp" -pix_fmt yuv420p -t 00:00:03 output.webm


  


  This is the result :


  


  As you see the 9 is visible in the red and blue channel and so are each of the other channels

  


  I have tried just extracting a single channel in a video, change the compression change the format change the color space, make sure that its all linear but each seem to have the limitation of some smearing/artifacts between the other channels.

  


  Is it at all possible to add different grayscale streams in the color channels without any artifacts and if so in which direction should i look ?

  


  Any help would be greatly appreciated !

  


• creating thumbnail from a video using ffmpeg in php exec() returns 1 but returns 0 if command is 'ffmpeg -h'

  23 septembre 2013, par user2807517

  creating thumbnail from a video using ffmpeg in php exec() returns 1 but returns 0 if command is 'ffmpeg -h'. i am using ubuntu. A portion of my code is as shown bellow. When i tried $cmd it returned 1 and when i tried $cmd1 it worked.

  $ffmpeg = 'ffmpeg';
  
  $getFromSecond = 5;
  
  $videoFile = $_FILES['file']['tmp_name'];
  
  $size = '105x73';
  
  $imageFile = 'Newimage.jpg';
  
  
  
  $cmd = "$ffmpeg -an -ss $getFromSecond -i $videoFile -vframes 1 -s $size $imageFile";
  
  $cmd1 = "$ffmpeg -h";

  works for $cmd1 but not for $cmd, i am thinking it is permission issues

• FFMPEG for APACHE 2.4.6 (x64), PHP 5.5 (x64), MYSQL 5.6 (x64) on WINDOWS 8 (x64) MACHINE

  8 mai 2014, par user2662327

  FFMPEG for APACHE 2.4.6 (x64), PHP 5.5 (x64), MYSQL 5.6 (x64) on WINDOWS 8 (x64) MACHINE

  I need to install FFMPEG on my windows 8 machine running DRUPAL ZEN custom theme. Can someone tell me where I can get the right dll files for this purpose ? If I have to compile them myself, can someone please give me step by step instructions for how to do so ? I have searched endlessly for these dlls for days now and I have no instructions for creating what i need manually. I have a windows machine running minGW.

  I already tried using the FFMPEG dlls that are out there on teh internet but my PHP-APACHE installations seem to be unable to properly detect the FFMPEG libraries (i added php_ffmpeg.dll to EXT folder, and the rest of hte DLLs to the WINDOWS/SYSTEM32 folder).

  I am running the following versions of PHP and APACHE. Thank you very much in advance for any help you can offer me.

  PHP Version 5.5.1
  System Windows NT 6.2 build 9200 (Windows 8 Business Edition) AMD64
  Build Date Jul 18 2013 11:04:03
  Compiler MSVC11 (Visual C++ 2012)
  Architecture x64

  APACHE VERSION
  Server version : Apache/2.4.6 (Win64)
  Apache Lounge VC10 Server built : Jul 16 2013 11:31:50