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• Converting an mp4 to mp3 : file not found

  8 décembre 2019, par Hywel Griffiths

  I’ve used the following code to convert an mp4 to mp3

  public static void main(String[] args) throws IOException, InterruptedException {
  
  
  
  String line;
  
  String mp4File = "/Users/hywelgriffiths/Documents/home/pictures/Test.mp4";
  
  String mp3File = "/Users/hywelgriffiths/Documents/home/pictures/Audio.mp3";
  
  
  
  // ffmpeg -i input.mp4 output.avi as it's on www.ffmpeg.org
  
  String cmd = "ffmpeg -i " + mp4File + " " + mp3File;
  
  Process p = Runtime.getRuntime().exec(cmd);
  
  BufferedReader in = new BufferedReadernew InputStreamReader(p.getErrorStream()));
  
  while ((line = in.readLine()) != null) {
  
  System.out.println(line);
  
  }
  
  p.waitFor();
  
  System.out.println("Video converted successfully!");

  Currently its not finding the file I’m setting to convert. I’ve put in a cd command in the terminal with the pathway and it takes it to the correct location of the file. The error I’m getting is :

  Exception in thread "main" java.io.IOException: Cannot run program "ffmpeg": error=2, No     
  
  such file or directory
  
  at java.lang.ProcessBuilder.start(ProcessBuilder.java:1048)
  
  at java.lang.Runtime.exec(Runtime.java:620)
  
  at java.lang.Runtime.exec(Runtime.java:450)
  
  at java.lang.Runtime.exec(Runtime.java:347)
  
  at Main.main(Main.java:37)
  
  Caused by: java.io.IOException: error=2, No such file or directory
  
  at java.lang.UNIXProcess.forkAndExec(Native Method)
  
  at java.lang.UNIXProcess.<init>(UNIXProcess.java:247)
  
  at java.lang.ProcessImpl.start(ProcessImpl.java:134)
  
  at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)
  
  ... 4 more
  
  
  
      in.close();
  
  
  
  }
  
  </init>

  Any help would be gratefully received

• Can I use ffmpeg from inside a Perl script without a system call ?

  16 décembre 2023, par Jared

  I'd like to convert mp3's to lower bitrates, as well as possibly convert video to mp3 using Perl. I looked at the ffmpeg module but it doesn't appear that it supports converting files, the only example I saw was grabbing pictures out of a video stream. Is there a way to do this in Perl with out using system() to call ffmpeg ?

  


• ffmpeg - add logo in a specific time interval

  14 novembre 2014, par Kåre Brøgger Sørensen

  Is there a way - in a one liner - where I do not have to use ffmpeg to calculate the duration of the whole video before i render ..

  I would like something like :

  ffmpeg -i ny_video_no_logo.mp4 -i /Pictures/home_logo_roed_new.png -filter_complex "[0:v][1:v]overlay=main_w-overlay_w-10:main_h-overlay_h-10:enable=’between(t,5.50,FULl_LENGTH - 10)’" -codec:a copy out.mp4

  I there a simple way like the "main_w" to get the video length inserted - I am using a non existing variable FULL_LENGTH in the above ?

  Or do i have to make a ffmpeg -i and extract the time from this ?