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• ffmpeg not capturing frames in windows using java

  19 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 opens web-cam then after sometime my web-cam hangs and it does not capture frames.

  I am using following method for that.

  public class FFMPEGClass {
  
  
  
      private String ffmpegExeLocation;
  
      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 + "ffplay -f dshow -video_size 640x480 -i video=\"" + capturingDName + "\"");
  
              Runtime.getRuntime().exec(ffmpegExeLocation + "ffplay -f dshow -video_size 640x480 -i video=\"" + capturingDName + "\"");
  
              System.out.println(ffmpegExeLocation + "ffmpeg -t 100000 "
  
                      + "-f vfwcap -s 640x480 -i 0 -r 1/" + framesPerSecond + " -f image2 " + outputImagesLocation + "\\camera%"+FRAME_DIGITS+"d.jpg");
  
              Runtime.getRuntime().exec(ffmpegExeLocation + "ffmpeg -t 100000 "
  
                      + "-f vfwcap -s 640x480 -i 0 -r 1/" + framesPerSecond + " -f image2 " + outputImagesLocation + "\\camera%"+FRAME_DIGITS+"d.jpg");
  
          } catch (Exception ex) {
  
              ex.printStackTrace();
  
          }
  
      }
  
  }

  In my case capturingDName is USB2.0 UVC VGA WebCam
  outputImagesLocation is d :\frames and
  framesPerSecond is 16

  For a moment if i run these commands in command prompt then also I am unable to capture frames.

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

• Add watermark text on mkv video using ffmpeg windows version [on hold]

  27 mars 2015, par sajjad hosseini

  I want to add a watermark text to a mkv video using ffmpeg windows version .
  I want the watermark to be like a subtitle that starts on minute 2 and lasts for 30 seconds and says : copyright to mysite.com . I tried mkvmerge to add a subtitle but it can be easily deleted by others , so now i’m relying on ffmpeg to do this for me . Can anyone help me with the process ? I want the watermark to be actually on the video and can’t be deleted using mkvmerge .

• cmdutils : Only do the windows-specific commandline parsing on _WIN32

  7 août 2013, par Diogo Franco

  cmdutils : Only do the windows-specific commandline parsing on _WIN32
  Fixes commandline parsing on Cygwin (on 64 bit, and on very recent
  
  32 bit), where the configure check does find the CommandLineToArgvW
  
  function (since it exists in the link libraries and in the headers),
  
  but whose GetCommandLineW() only returns the application’s path.
  
  (This is due to a cygwin internal optimization, see
  
  http://cygwin.com/ml/cygwin/2013-07/msg00538.html for details.)
  
  Arguments are only given through main’s argc/argv, and they’re already
  
  UTF-8.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] cmdutils.c