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• How does the ProcessBuilder constructor parameter work ?

  19 septembre 2014, par Houseman

  I’m doing this :

  String[] command = {ffmpegLoc+"ffmpeg.exe",
  
              "-i ",
  
              "\""+dir+params.getString(4)+".flv"+"\"",
  
              "-copyts",
  
              "-crf 18",
  
              "-profile:v baseline",
  
              "-level 3.0",
  
              "-pix_fmt yuv420p",
  
              "-preset veryslow",
  
              "\""+dir+params.getString(4)+".mp4"+"\""};
  
      try {
  
          getLogger().info("ffmpeg command " + command);
  
          ProcessBuilder builder = new ProcessBuilder(command);
  
          builder.redirectErrorStream(true);
  
          getLogger().info("Starting process");
  
          Process process = builder.start();
  
          InputStream stream =  process.getInputStream();
  
          BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream()));
  
          String line = null;
  
          while((line = in.readLine()) != null) {
  
            System.out.println(line);
  
          }
  
          process.waitFor();

  And I get this error from ffmpeg, which initializes correctly :

  Unrecognized option 'i '.
  
  Error splitting the argument list: Option not found

  So I thought "Maybe I don’t need to split out each argument into an array"

  So I replaced the command with this :

  String[] command = {ffmpegLoc+"ffmpeg.exe",
  
                  "-i " + "\""+dir+params.getString(4)+".flv"+"\"" + " -copyts -crf 18 -profile:v baseline -level 3.0 -pix_fmt yuv420p -preset veryslow "+"\""+dir+params.getString(4)+".mp4"+"\""};

  And now I get this :

  Unrecognized option 'i C:/Program'.
  
  Error splitting the argument list: Option not found

  What happened to that hyphen before i ?

  What happened to those double quotes wrapping the path to the .flv file ?

  What is going on here ?

  Edit :

  I dropped the escaped double-quotes, as per this answer, and now I get this :

  Unrecognized option 'i C:/Program Files (x86)/Wowza Media Systems/Wowza Streaming Engine 4.1.0/content/recorder/vid_test001.flv -copyts -crf 18 -profile:v baseline -level 3.0 -pix_fmt yuv420p -preset veryslow C:/Program Files (x86)/Wowza Media Systems/Wowza Streaming Engine 4.1.0/content/recorder/vid_test001.mp4'.
  
  Error splitting the argument list: Option not found

  And again that hyphen in front of the i is missing.

  Edit 2 :

  Let’s combine them : No escaped double-quotes combined with arguments each on their own index :

  String[] command = {ffmpegLoc+"ffmpeg.exe",
  
              "-i",
  
              dir+params.getString(4)+".flv",
  
              "-copyts", 
  
              "-crf 18",
  
              "-profile:v baseline",
  
              "-level 3.0",
  
              "-pix_fmt yuv420p",
  
              "-preset veryslow",
  
              dir+params.getString(4)+".mp4"};

  ffmpeg now gives me :

  Unrecognized option 'crf 18'.

  So we got to where we encountered our first whitespace, then failed.

• Set content-length when converting video stream to audio (w/ FFMPEG & Node.js)

  15 septembre 2014, par Taconut

  So I’m building a program that requires that I take a video and convert it to audio. I’m currently streaming the audio directly to the browser via node.js, but I’ve run into a major problem : I don’t know how to find out how many bytes my audio is. As a result, the browser keeps throwing net::ERR_CONTENT_LENGTH_MISMATCH when I don’t get the right content-length. I’ve tried several strategies, all of which have failed :

  • Computing the size manually (Seconds * bitrate(kbps) * (1024 / 8)).
    This produces an approximate answer, since I only know the length down to the nearest couple of seconds. Even though I’m relatively close, I still end up getting the same MISMATCH error.

  • Piping the Stream to a buffer, getting the buffer’s length, and piping the buffer to the browser
    This works, but it can take 15-20 seconds to load each song. It’s incredibly slow and puts a considerably larger load on the server

• FFMPEG - Merge two video files into one [duplicate]

  24 septembre 2015, par Maximus

  This question already has an answer here :

  • Concatenate two mp4 files using ffmpeg
    
    8 answers
    

  I have converted two different format videos into TS format by using FFMPEG and now I am trying to merge them into one video. I have used following two commands but the output file only shows the first video.

  1. ffmpeg -i "concat:1.ts|2.ts" -c copy -qscale:v 2 output.mp4
  2. ffmpeg -i "concat:1.ts|2.ts" -c copy -bsf:a aac_adtstoasc -qscale:v 2 output.mp4

  1.ts video does not have audio.