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• How to read percentage from ffmpeg command in java ?

  23 juillet 2019, par Prasab R

  I am trying to convert video file to specific format by executing ffmpeg command. In that process I want to read percentage by using timepattern format. Somehow I am not able to do it.

  I have tried using the below code. Specially I am getting null in the while loop condition.

  import java.io.*;
  
  import java.util.Scanner;
  
  import java.util.regex.Pattern;
  
  
  
  class Test {
  
    public static void main(String[] args) throws IOException {
  
      ProcessBuilder pb = new ProcessBuilder("ffmpeg","-i","in.webm","out.mp4");
  
      final Process p = pb.start();
  
  
  
      new Thread() {
  
        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;
  
          while (null != (match = sc.findWithinHorizon(timePattern, 0))) {
  
            double progress = Double.parseDouble(match) / totalSecs;
  
            System.out.printf("Progress: %.2f%%%n", progress * 100);
  
          }
  
        }
  
      }.start();
  
  
  
    }
  
  }

  I am expecting a value in the while condition, but it coming as null.enter code here

• FFMPEG Add recording to this command

  4 août 2019, par Jorge Forero

  Raspberry Pi IP camera on my network broadcasting to a web browser. I want to save 10 minutes long video clips. This is the line :

  raspivid  -t -0 -w 1080 -h 720 -awb auto -fps 30 -b 1200000 -o - |ffmpeg -loglevel quiet -i - -vcodec copy -an -f flv -metadata streamName=myStream tcp://0.0.0.0:6666& 

  Following a youtube tutorial I managed to watch my rpi ip camera on the browser but I want to record myself sleeping to detect any breath interruption.

  raspivid  -t -0 -w 1080 -h 720 -awb auto -fps 30 -b 1200000 -o - |ffmpeg -loglevel quiet -i - -vcodec copy -an -f flv -metadata streamName=myStream tcp://0.0.0.0:6666&

  Works fine ! I only want to add recording to a file 10 minutes videos (in chronological order if it’s possible)

• ffmpeg command line encrption/decryption

  5 août 2019, par gaamaa

  I need to decrypt the RTMP key from inside ffmpeg command line parser.
  Could some ffmpeg experts help me to show the right function ?

  I tried FFmpeg-master\fftools\cmdutils.c file and at function

  static void prepare_app_arguments(int *argc_ptr, char ***argv_ptr)
  
  

  I couldn’t succeed.

  File Name : FFmpeg-master\fftools\cmdutils.c

  static void prepare_app_arguments(int *argc_ptr, char ***argv_ptr)
  
  {
  
      char *argstr_flat;
  
      wchar_t **argv_w;
  
      int i, buffsize = 0, offset = 0;
  
  
  
      if (win32_argv_utf8) {
  
          *argc_ptr = win32_argc;
  
          *argv_ptr = win32_argv_utf8;
  
          return;
  
      }
  
  
  
      win32_argc = 0;
  
      argv_w = CommandLineToArgvW(GetCommandLineW(), &win32_argc);
  
      if (win32_argc <= 0 || !argv_w)
  
          return;
  
  
  
      /* determine the UTF-8 buffer size (including NULL-termination symbols) */
  
      for (i = 0; i < win32_argc; i++)
  
          buffsize += WideCharToMultiByte(CP_UTF8, 0, argv_w[i], -1,
  
                                          NULL, 0, NULL, NULL);

  Kindly show me the correct souce code file and the function to experiment.
  So that I could pass the encrypted RTMP key as command line and inside ffmpeg I could decrypt.