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• Is there a factor in ffmpeg code that cuts video time ?

  13 janvier 2020, par user12263143

  Im using ffmpeg to change resolution of video file and after conversion to another location the video lasts 0 seconds, but originally it lasts 2mins
  My ffmepg code :

  ffmpeg -i input.mp4 -filter:v scale=480:320 -t 5 output.mp4

• Ffmpeg script cuts out sound

  15 février 2019, par Liam

  I have this ffmpeg script I’m running to automatically convert videos to instagram’s accepted coded

  The script looks like this :

  ffmpeg -analyzeduration 20M -probesize 20M -y -re -f lavfi -i "movie=filename='file.mp4':loop=5, setpts=N/(FRAME_RATE*TB)" -vcodec libx264 -b:v 3500k -vsync 2 -t 59 -acodec aac -b:a 128k -pix_fmt yuv420p -vf "scale=1080:1080:force_original_aspect_ratio=decrease,pad=1080:1080:(ow-iw)/2:(oh-ih)/2:white" -crf 24 new_file.mp4

  However that seems to cut out the audio, and I can’t seem to find out how to prevent that ? I didn’t use any -an or anything, and when messing around the audio keeps being cut out ? Any idea why ?

• 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