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• Processing a video on a webserver [on hold]

  6 septembre 2013, par Django Reinhardt

  A client is interested in applying a Sepia style filter, as well as title cards, to user-uploaded videos on their website. This would obviously be automated on their webserver, and it seems ffmpeg, dvd-slideshow and/or aviDemux are good ways to make this happen.

  Unfortunately, from what I've read, such processing would require a lot of webserver CPU power — far more than the average webserver usually has. How can I practically perform these calculations on a website ?

  Should I just try and go for a beefy dedicated hosting package, or can I rent another server that's more suited to video processing ?

• System.Diagnostics.Process calling FFMPEG fails with international character

  1er septembre 2013, par Petter Brodin

  I'm using System.Diagnostics.Process to launch FFMPEG, and it works as intended on paths that only contain non-special characters.

  string strParam = "C:\myFolder\foo.png";
  
  
  
  Process ffmpeg = new Process();
  
  
  
  ffmpeg.StartInfo.UseShellExecute = false;
  
  ffmpeg.StartInfo.RedirectStandardOutput = true;
  
  
  
  ffmpeg.StartInfo.FileName = Path_FFMPEG;
  
  ffmpeg.StartInfo.Arguments = strParam;
  
  
  
  ffmpeg.Start();
  
  
  
  ffmpeg.WaitForExit();

  The above example works perfectly, but if I use "c :\myFolder\føø.png" I get the following error message :

  Could find no file with path 'C.\myFolder\f├©├©.png'

  This looks like some kind of encoding error, but that's where my ideas stop.

• 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