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• ProcessBuilder is executing last

  8 juillet 2015, par Ryan

  I have a segment of code something like this

  File f = new File("Audio/Testing/mbgitr.wav");
  
      try {
  
          ProcessBuilder pb = new ProcessBuilder("bash/extractAudio.sh", f.getAbsolutePath());
  
          pb.inheritIO();
  
          pb.start();
  
      }catch(IOException e){
  
          System.out.println("Oh no!");
  
      }
  
      System.out.println(new File("Audio/mbgitr.wav").exists());

  The bash file converts the audio file to a different format/sample rate and outputs it to the folder Audio. But whenever I run this script, I get the following output :

  /home/Ryan/Development/Java/Test/Audio/Testing/mbgitr.wav
  
  mbgitr.wav
  
  /home/Ryan/Development/Java/Test
  
  false
  
  ffmpeg version 2.6.2 Copyright (c) 2000-2015 the FFmpeg developers
  
  [more ffmpeg output]
  
  
  
  Process finished with exit code 0

  It seems that the line of code testing if the file exists is executing before the code running the script. If I were to run the program again, it would ouput "true" because the file was already created in the last iteration. Is there a way to get the file called by the ProcessBuilder to execute first ? Thanks in advance !

• Adding text to movie using ffmpeg

  23 août 2014, par microspace

  I use git to track *.ass subtitle files.
  Here is example of *.ass file :

  [Script Info]
  
  ; Script generated by Aegisub 3.1.2
  
  ; http://www.aegisub.org/
  
  Title: Default Aegisub file
  
  ScriptType: v4.00+
  
  
  
  [V4+ Styles]
  
  Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour,    BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
  
  Style: Default,Arial,20,&H00FFFFFF,&H000000FF,&H00000000,&H00000000,0,0,0,0,100,100,0,0,1,2,2,2,10,10,10,1
  
  Style: titr,DejaVu     
  
  
  
  Sans,20,&H007DDBFA,&H000000FF,&H00000000,&HFF000000,0,0,0,0,100,100,0,0,1,2,2,1,10,10,10,1
  
  
  
  [Events]
  
  Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
  
  Dialogue: 0,0:00:00.46,0:00:11.22,Default,,0,0,0,,Если это можно было бы
  
  Dialogue: 0,0:00:03.44,0:00:08.96,titr,,0,0,0,,{\pos(20,240)\fad(600,600)}бывший министр

  After commit I burn subtitles into video :

  ffmpeg -i video.avi -vf "ass=subtitle.ass" out.avi

  My goal is to show commit date for 10 second at the start of movie. This should be done automatically.

  1) It can be easily done with by modifying subtitle.ass itself, but I can’t do it after commit and there are other reasons.

  2) It can be done by ffmpeg from command line : How to use ffmpeg to add a text to avi video ?

  Problem is that in this case text will be shown for the whole lenght of movie.

  3) I can copy *.ass file to temporary directory, insert date, render and delete *.ass file.

  Is there a simpler way ?

• doc : delete viterbi.txt

  10 novembre 2013, par Timothy Gu

  doc : delete viterbi.txt
  The description has been moved to the FFmpeg wiki :
  
  https://trac.ffmpeg.org/wiki/ViterbiAlgorithm
  Signed-off-by : Timothy Gu <timothygu99@gmail.com>
  

  • [DH] doc/viterbi.txt