Recherche avancée

Sur d’autres sites (6336)

• Using gcovr with FFmpeg

  6 septembre 2010, par Multimedia Mike — FATE Server

  When I started investigating code coverage tools to analyze FFmpeg, I knew there had to be an easier way to do what I was trying to do (obtain code coverage statistics on a macro level for the entire project). I was hoping there was a way to ask the GNU gcov tool to do this directly. John K informed me in the comments of a tool called gcovr. Like my tool from the previous post, gcovr is a Python script that aggregates data collected by gcov. gcovr proves to be a little more competent than my tool.

  Results
  Here is the spreadsheet of results, reflecting FATE code coverage as of this writing. All FFmpeg source files are on the same sheet this time, including header files, sorted by percent covered (ascending), then total lines (descending).

  Methodology
  I wasn’t easily able to work with the default output from the gcovr tool. So I modified it into a tool called gcovr-csv which creates data that spreadsheets can digest more easily.

  • Build FFmpeg using the '-fprofile-arcs -ftest-coverage' in both the extra cflags and extra ldflags configuration options
  • 'make'
  • 'make fate'
  • From build directory : 'gcovr-csv > output.csv'
  • Massage the data a bit, deleting information about system header files (assuming you don’t care how much of /usr/include/stdlib.h is covered — 66%, BTW)

  Leftovers
  I became aware of some spreadsheet limitations thanks to this tool :

  1. OpenOffice can’t process percent values correctly– it imports the percent data from the CSV file but sorts it alphabetically rather than numerically.
  2. Google Spreadsheet expects CSV to really be comma-delimited– forget about any other delimiters. Also, line length is an issue which is why I needed my tool to omit the uncovered ine number ranges, which it does in its default state.

• Any way to assign terminal output to variable with python ?

  12 août 2016, par Gordon Fontenot

  I need to grab the duration of a video file via python as part of a larger script. I know I can use ffmpeg to grab the duration, but I need to be able to save that output as a variable back in python. I thought this would work, but it’s giving me a value of 0 :

  cmd = 'ffmpeg -i %s 2>&1 | grep "Duration" | cut -d \' \' -f 4 | sed s/,//' % ("Video.mov")
  
  duration = os.system(cmd)
  
  print duration

  Am I doing the output redirect wrong ? Or is there simply no way to pipe the terminal output back into python ?

• Pass a process to a subclass

  16 décembre 2014, par Brett

  I would like to pass a process to a subclass so I may kill it but I can’t figure out how to pass the process. I’m unsure how to store it so I can return it to the form and be able to call the subclass method to kill it. here are my classes

  package my.mashformcnts;
  
  import java.io.IOException;
  
  import java.util.Scanner;
  
  import java.util.regex.Pattern;
  
  
  
  
  
  /**
  
   *
  
   * @author brett
  
   */
  
  public class MashRocks {
  
  
  
      public static Process startThread(MashFormCnts mashFormCnts) throws IOException {
  
          ProcessBuilder pb = new ProcessBuilder("ffmpeg", "-i", "C:\\Users\\brett\\Documents\\Telegraph_Road.mp4", "C:\\Users\\brett\\Documents\\out.mp4");
  
  
  
          //Here is where i would like to name and store the Process
  
  
  
  
  
          final Process p = pb.start();
  
          // create a new thread to get progress from ffmpeg command , override  
  
          // it's run method, and start it!  
  
          Thread t = new Thread() {
  
              @Override
  
              public void run() {
  
                  Scanner sc = new Scanner(p.getErrorStream());
  
                  // Find duration  
  
                  Pattern durPattern = Pattern.compile("(?<=Duration: )[^,]*");
  
                  String dur = sc.findWithinHorizon(durPattern, 0);
  
                  if (dur == null) {
  
                      throw new RuntimeException("Could not parse duration.");
  
                  }
  
                  String[] hms = dur.split(":");
  
                  double totalSecs = Integer.parseInt(hms[0]) * 3600 + Integer.parseInt(hms[1]) * 60 + Double.parseDouble(hms[2]);
  
                  System.out.println("Total duration: " + totalSecs + " seconds.");
  
                  // Find time as long as possible.  
  
                  Pattern timePattern = Pattern.compile("(?<=time=)[\\d:.]*");
  
                  String match;
  
                  String[] matchSplit;
  
                  //MashForm pgbar = new MashForm();
  
                  while (null != (match = sc.findWithinHorizon(timePattern, 0))) {
  
                      matchSplit = match.split(":");
  
                      double progress = (Integer.parseInt(matchSplit[0]) * 3600 + Integer.parseInt(matchSplit[1]) * 60 + Double.parseDouble(matchSplit[2])) / totalSecs;
  
                      int prog = (int) (progress * 100);
  
                      mashFormCunts.setbar(prog);
  
                  }
  
              }
  
          };
  
         t.start();
  
         return p;
  
      }
  
     public synchronized static void stop(Thread t) throws IOException{
  
             Runtime.getRuntime().exec("taskkill /F /IM ffmpeg.exe");  
  
              t = null;
  
            //t.interrupt();
  
  
  
  
  
  
  
     }
  
  }
  
     class killMash extends MashRocks{
  
      public static void Kfpeg(Process p){
  
  
  
        p.destroyForcibly();
  
      }
  
  }

  So those are my classes. I’m very new.

  Next there is the event Listener on the form, so when I click this I want to kill the ffmpeg proecess with the Thread t :

    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                         
  
          // TODO add your handling code here:
  
          Thread n = Thread.currentThread();
  
          System.out.print(n);
  
          try {
  
              //MashRocks.stop(n);
  
               //This isnt working but i think its closer
  
               killMash.Kfpeg(MashRocks.startThread(this)); 
  
  //Not Sure what to do here
  
    //here is where i want to pass the process sorry for the typo
  
    killMash.kfpeg(p); 
  
              } catch (IOException ex) {
  
                  Logger.getLogger(MashFormCunts.class.getName()).log(Level.SEVERE, null, ex);
  
              }
  
  
  
          }   

  Any help is awesome cheers