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• How to implement FFMEG library for android video streaming

  10 mai 2014, par Kabir

  I am trying to create online streaming video player in android.
  I am trying to compile the appunite/AndroidFFmpeg library for android application to play HLS videos online. I am using linux-ubuntu OS I also have set the NDK path.
  I have executed all command one by one given on the link :

  https://github.com/appunite/AndroidFFmpeg

  But when I executed the following script :

  ./build_android.sh

  I got the following error :

  abi-gcc —sysroot=/home/singsys-063/android-ndk-r9d/platforms/android-5/arch-arm/
  checking whether the C compiler works... no
  configure : error : in
  /home/singsys-063/AndroidFFmpeg/FFmpegLibrary/jni/vo-amrwbenc :
  configure : error : C compiler cannot create executables
  See config.log for more details

• How to install ffmpeg using xampp

  28 avril 2014, par Paul Ledger

  I am trying to install ffmpeg onto my localhost server. I have followed countless blogs and tutorials online form other people who are stuck with this same problem. I follow everything to the letter.

  1. Unzip the file
  2. Copy php_ffmpeg.exe to ext folder in php
  3. copy the rest to system 32

  As it says however when I do this I get this error when I start apache.

  

  Fair play but it is in the folder

  

  I also get this error as well :

  

  And Again, here it is :
  

  I have added the extention to my php.ini file

  extension=php_ffmpeg.dll

  The first time I go this to work I placed the ffmpeg.exe file onto my local host server and ran commands like this :

  $cmd = "$ffmpegpath -i $input -an -ss $sec -s $size $output";
  
  shell_exec($cmd);

  This works fine on my computer but not on an actual server. Could somebody offer some advice or guidene on where I have one wrong installing the extension or why running the .exe file on a lunix server with shell_exec doesn’t work

• Zooming animation in FFMPEG

  2 novembre 2015, par dmcontador

  I need to make a zooming animation for a video input.

  Making a panning animation is possible with the crop filter with something like this :

  "crop=320:240:max(0\\,min(iw-ow\\,n)):0"

  Where the first two parameters, width and height, are fixed, and the second two parameters, accept frame number n or timestamp t as expression parameters.

  But width and height are evaluated only once (and cannot use n or t), so I cannot crop a size in function of time and then apply a scale filter to the original size.

  I know I can :

  • Change the filter after pulling each frame from the buffersink (I’m not in the command line, I’m using the libraries in my software). I’m doing that already, but no for every frame, only by user request in an online application.
  • Use geq filter to "apply a generic equation to each frame".

  Both approaches seem expensive. Is there another filter or approach I could use ?

  Note that I’m using zeranoe FFMPEG libraries in Windows. I’d rather not develop my own filters or modify FFMPEG source.