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• ffmpeg LGPL Windows x64 compile error

  29 août 2013, par Cosmin Marc

  I'm trying to compile ffmpeg for Windows 7 64bit version with LGPL license.
  To configure this, I'm using the following command :
  ./configure --prefix=ffmpeg/ --enable-shared --extra-cflags=-I/c/MinGW/include --yasmexe='C:/yasm/yasm-1.2.0-win64.exe' --enable-version3 --cpu=i686 --arch=x86_64

  after executing this command I receive the following error :

  gcc is unable to create an executable file. If gcc is a cross-compiler, use the —enable-cross-compile option. Only do this if you know what cross compiling means. C compiler test failed.

  If you think configure made a mistake, make sure you are using the latest version from Git. If the latest version fails, report the problem to the ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net. Include the log file "config.log" produced by configure as this will help solving the problem.

  Cross compiling is not what I want... I just want to compile the ffmpeg on W7 x64 with LGPL license.

• optimizing ffmpeg in windows platform for processing with web-cam

  22 août 2013, par user2320537

  I have to develop a tool in java that will capture frames from webcam, Now what I have done for that is, I have used Runtime class to run ffmpeg and other commands, when it starts capturing frames from my web-cam,
  I am using following method for that.

  public class FFMPEGClass {
  
  
  
      private String ffmpegExeLocation, line;
  
      private final String FRAME_DIGITS = "010";
  
  
  
      public FFMPEGClass(String capturingDName, String outputImagesLocation, int framesPerSecond) {
  
          ffmpegExeLocation = System.getProperty("user.dir") + "\\bin\\";
  
          System.out.println(ffmpegExeLocation);
  
          try {            
  
              System.out.println(ffmpegExeLocation + "ffmpeg -t 100000 "
  
                      + "-f vfwcap -s 640x480 -i 0 -r 1/" + framesPerSecond + " -f image2 " + outputImagesLocation + "\\camera%"+FRAME_DIGITS+"d.jpg");
  
              Process pp = Runtime.getRuntime().exec(ffmpegExeLocation + "ffmpeg -t 100000 "
  
                      + "-f vfwcap -s 640x480 -i 0 -r 1/" + framesPerSecond + " -f image2 " + outputImagesLocation + "\\camera%"+FRAME_DIGITS+"d.jpg");
  
              BufferedReader br = new BufferedReader(new InputStreamReader(pp.getErrorStream()));
  
              while((line = br.readLine()) != null){
  
                   System.out.println(line);
  
              }
  
          } catch (Exception ex) {
  
              ex.printStackTrace();
  
          }
  
      }
  
  }

  In my case capturingDName is USB2.0 UVC VGA WebCam
  outputImagesLocation is e :\myfolder\frames and
  framesPerSecond is 10

  This code works well but it is unable to capture frames efficiently, In other words I want to say that its processing is very slow, can anyone please tell that how can I optimize it so that it can capture frames very fastly.

  I have Intel Core i3 processor with 6 GB of RAM

  I have already checked many answers from google and stackoverflow but these are not working in my case

• Windows 7 add user path variable for ffmpeg

  17 janvier 2015, par user2601430

  I am trying to add a user path varible for ffmpeg. It is located in D :\AppRun\FFmpeg\bin on my disk. In the Environment Variables dialog I clicked new and I entered ffmpeg for the varible name and D :\AppRun\FFmpeg\bin for the varible value. Clicked OK. Opened cmd prompt. Typed ffmpeg, and it says its not recognized as an internal or external command. What am I doing wrong ??
  I logged off and on but that did not help