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• Using ffmpeg to encode a high quality video

  7 janvier 2013, par CakeMaster

  I have a set of video frames saved as images in a directory, and I'm trying to encode these to a good quality video, however every setting and every format I try produces very noticeable artifacts.

  The basic command is this :

  ffmpeg -r 25 -i %4d.png myvideo.mpg

  and I've tried the minrate and maxrate flags. Any of mpg, avi, mov, flv formats will do.

  Any suggestions for settings ? Final file size is not an issue.

• 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

• Using FFMPEG to reliably convert videos to mp4 for iphone/ipod and flash players

  23 avril 2016, par Jake Stevenson

  I need to convert videos for use in both a flash player and the iphone/ipod touch. I’m using the following batch script with ffmpeg :

  @echo off
  
  ffmpeg.exe -i %1 -s qvga -acodec libfaac -ar 22050 -ab 128k -vcodec libx264 -threads 0 -f ipod %2

  This always outputs an mp4 file, and I can always play it on my PC. The videos also seem to play fine on my iphone 3GS. But with some input files it won’t work for older iphone versions (3G and iPod touch).

  Here’s the ffmpeg output from one such file :

  D:\ffmpeg>encode.bat d:\temp\recording.flv d:\temp\out.m4v
  
  FFmpeg version SVN-r18709, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  
    configuration: --enable-memalign-hack --prefix=/mingw --cross-prefix=i686-ming
  
  w32- --cc=ccache-i686-mingw32-gcc --target-os=mingw32 --arch=i686 --cpu=i686 --e
  
  nable-avisynth --enable-gpl --enable-zlib --enable-bzlib --enable-libgsm --enabl
  
  e-libfaac --enable-libfaad --enable-pthreads --enable-libvorbis --enable-libtheo
  
  ra --enable-libspeex --enable-libmp3lame --enable-libopenjpeg --enable-libxvid -
  
  -enable-libschroedinger --enable-libx264
  
    libavutil     50. 3. 0 / 50. 3. 0
  
    libavcodec    52.27. 0 / 52.27. 0
  
    libavformat   52.32. 0 / 52.32. 0
  
    libavdevice   52. 2. 0 / 52. 2. 0
  
    libswscale     0. 7. 1 /  0. 7. 1
  
    built on Apr 28 2009 04:04:42, gcc: 4.2.4
  
  [flv @ 0x187d650]skipping flv packet: type 18, size 164, flags 0
  
  Input #0, flv, from 'd:\temp\recording.flv':
  
    Duration: 00:00:07.17, start: 0.001000, bitrate: N/A
  
      Stream #0.0: Video: flv, yuv420p, 320x240, 1k tbr, 1k tbn, 1k tbc
  
      Stream #0.1: Audio: nellymoser, 44100 Hz, mono, s16
  
  [libx264 @ 0x13518b0]using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE
  
  4.2
  
  [libx264 @ 0x13518b0]profile Baseline, level 4.2
  
  Output #0, ipod, to 'd:\temp\out.m4v':
  
      Stream #0.0: Video: libx264, yuv420p, 320x240, q=2-31, 200 kb/s, 1k tbn, 1k
  
  tbc
  
      Stream #0.1: Audio: libfaac, 22050 Hz, mono, s16, 128 kb/s
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
    Stream #0.1 -> #0.1
  
  Press [q] to stop encoding
  
  frame=   90 fps=  0 q=-1.0 Lsize=     128kB time=6.87 bitrate= 152.4kbits/s
  
  video:92kB audio:32kB global headers:1kB muxing overhead 2.620892%
  
  [libx264 @ 0x13518b0]slice I:8     Avg QP:29.62  size:  7047
  
  [libx264 @ 0x13518b0]slice P:82    Avg QP:30.83  size:   467
  
  [libx264 @ 0x13518b0]mb I  I16..4: 17.9%  0.0% 82.1%
  
  [libx264 @ 0x13518b0]mb P  I16..4:  0.6%  0.0%  0.0%  P16..4: 23.1%  0.0%  0.0%
  
   0.0%  0.0%    skip:76.3%
  
  [libx264 @ 0x13518b0]final ratefactor: 57.50
  
  [libx264 @ 0x13518b0]SSIM Mean Y:0.9544735
  
  [libx264 @ 0x13518b0]kb/s:8412.6

  My suspicion is that it has something to do with the audio encoding. If so, does anyone know how to force it to reencode the audio to the proper format ?

  Any other ideas ?