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• Building ffmpeg for Windows with MSYS and MinGW

  27 février 2014, par Tech Jerk

  I am trying to build ffmpeg for windows (Xp - SP2) as given here.

  ./configure -–extra-cflags=”-mno-cygwin -mms-bitfields” -–extra-ldflags=”-Wl, -add-stdcall-alias” -–enable-memalign-hack -–enable-shared -–disable-static -–target-os=mingw32

  The above command is placed in a myconfig file as instructed and when i run ./myconfig, the following error is displayed :

  Broken Shell detected. Trying alternatives.
  
  Trying Shell bash
  
  Unknown option "-–extra-cflags=-mno-cygwin".

  As suggested in the link i tried various options but still i was not able to succeed.

  My environment is Win XP with :

  • MinGW-5.1.6,
  • bash-2.05b-MSYS,
  • MSYS-1.0.10,
  • ffmpeg-0.5

  EDIT :

  After certain changes in the above command by referring howto i was able to successfully run the make command and i found the following DLL's in their respective directory

  • ffmpeg\libavcodec\avcodec-51.dll
  • ffmpeg\libavformat\avformat-51.dll
  • ffmpeg\libavutil\avutil-49.dll

  But i didn't see any ffmpeg\ffmpeg.exe file :(

  What could have gone wrong ?

• imageJpeg and FFMPEG in windows vs linux

  25 janvier 2020, par Tanmay Gawankar

  I have a working code for converting image to a 5 seconds video using FFMPEG.

  The problem is, The code only works for downloaded images, FFMPEG doesn’t convert image to video when image is generated programmatically ONLY IN LINUX.

  PHP code

  <?php
  
      $downloadedF="folder/d.jpg";
  
      $downloadedV="folder/d.mp4";
  
      $renderedF="folder/r.jpg";
  
      $renderedV="folder/r.mp4";
  
  
  
      $op_d=shell_exec("ffmpeg -r 1/5 -i ".$downloadedF." -c:v libx264 -vf fps=25 -pix_fmt yuv420p ".$downloadedV);
  
      $op_r=shell_exec("ffmpeg -r 1/5 -i ".$renderedF." -c:v libx264 -vf fps=25 -pix_fmt yuv420p ".$renderedV);
  
  
  
      echo "Errors:<br />".$op_d."<br /><br />".$op_r;
  
  ?>

  The d.mp4(or output for downloaded image) is getting generated for both Windows and Linux
  The r.mp4(or output for rendered image) gets generated only in Windows and 48 bytes empty file is getting created in Linux

  System :

  XAMPP on Windows 10(Development)
  Godaddy Starter plan hosting - Linux(Probably redhat)(Production)

  File Structure

  root folder
  
      |-index.php
  
      |-ffmpeg (will be ffmpeg.exe in Windows)
  
      |-folder
  
          |-d.jpg (random downloaded image from google)
  
          |-d.mp4 (Will be created - video converted from downloaded image)
  
          |-r.jpg (rendered image using php imagejpg)
  
          |-r.mp4 (Will be created - video converted from rendered image)

  Rendered Image Code :

  $imgFF = imagecreatetruecolor($videoWidth, $videoHeight);
  
  //---adding many text using imagettftext();
  
  imagejpeg($imgFF, $path."-000.jpg");  //for this example, I copied output to folder as r.jpg

  Edit 1 :

  The return value of shell_exec has no error/output even after adding

  error_reporting(E_ALL);
  
  ini_set('display_errors', 1);

  Edit 2 :

  The log for successful conversion can be found at Here
  The log for unsuccessful conversion of rendered image can be found at Here

  Note :

  • The scenario here is minimized and code is separated from long code.
  • In Linux command i add ./ for FFMPEG

• Can you think of a reason why windows might not enable audio if noone is logged in ?

  3 juillet 2017, par Caius Jard

  I’m having a bizarre problem with some virtual servers created to record podcasts. They run on amazon AWS as windows server 2012 instances and a small c# app tells FFMPEG to do the heavy lifting of capturing from the virtual screen and reading from the virtual sound card (Virtual Audio Cable : https://en.wikipedia.org/wiki/Virtual_Audio_Cable) via DirectShow filters

  The problem I have is if I leave the machine to do its stuff unattended, the recordings are sometimes silent. If I log in via VNC and watch it doing its stuff the audio is recorded just fine. All other aspects of the test op are the same, and the virtual machine is shut down between successive recordings so each one should theoretically be a clean slate. The app runs under a logged in session (hence the use of VNC rather than RDP)

  I’m now wondering if there is some optimisation of the windows sound engine whereby it doesn’t bother playing audio if it thinks noone is listening. The confusing thing to me is that not every virtual machine suffers these problems ; some of them record fine (and they’re all created from the same seed virtual hard disk image) in unattended mode

  I’m asking this question with the aim of getting together a list of things I can check/look into/debug.. I don’t have much knowledge of how MME/DirectSound/WASAPI work internally...