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• FFmpeg split audio in silence in a LIVESTREAM

  30 octobre 2023, par Dikkie21

  With FFMPEG I can split audio files by silence. That works great !

  


  Now I am trying to do the same in an MP3 livestream of a radio channel, but that is obviously not possible with the segment option. Is it possible to have FFmpeg do that live or do I have to record the live stream for a long time and split it afterwards ?

  


  I have looked for an option other than segment to split an audio stream, for example duration, but I cannot find it applied with silence detection.

  


• Java shelling out to FFMPEG not running nor giving error

  4 janvier, par Todd

  I'm writing a Podcast downloader where I want to be able to download one or more podcasts then run them through FFMPEG.

  


  It does run when I run the program in Windows.
  
It does not run when I run the program in Linux - Meaning FFMPEG may or may not have been called. I have no way of knowing. I get a -1 back from process.waitfor() but no error in my Java logs and no entries at all in the ffmpeg.log file. And there is no file in the processed file directory that FFMPEG would have created.
  
It does run in Linux if I run the same command that fails in Java from the command line.

  


  FFMPEG has the permissions : rwxr-xr-x , so it doesn't seem as if it'd be a permission error. The Java code looks like :

  


      ProcessBuilder processBuilder = new ProcessBuilder( commands );
    processBuilder.redirectErrorStream( true );
    //  Added the next line to see if I could log an error from ffmpeg
    processBuilder.redirectOutput( ProcessBuilder.Redirect.appendTo( new File( "./ffmpeg.log" ) ) );

    Process process = processBuilder.start();
    BufferedReader bufferedOutputReader = new BufferedReader( new InputStreamReader( process.getInputStream() ) );
    do {
        outputString = bufferedOutputReader.readLine();
        if ( outputString != null ) {
            LOGGER.trace( outputString );
        }
    } while ( outputString != null );
    results = process.waitFor();
    LOGGER.debug( "Exit value: " + results );


  


  The commands are :

  


  2023-10-25 16:21:52,452 224257 [pool-1-thread-4] DEBUG org.sperbolink.utils.CodecUtils - command string: /bin/ffmpeg 
2023-10-25 16:21:52,452 224257 [pool-1-thread-4] DEBUG org.sperbolink.utils.CodecUtils - command string: -y 
2023-10-25 16:21:52,452 224257 [pool-1-thread-4] DEBUG org.sperbolink.utils.CodecUtils - command string: -i 
2023-10-25 16:21:52,452 224257 [pool-1-thread-4] DEBUG org.sperbolink.utils.CodecUtils - command string: "/home/todd/aggregator/incoming/Downrange Radio/Downrange_Radio_2023-02-15_The_Avidity_PD-10_Delivers_.mp3" 
2023-10-25 16:21:52,452 224257 [pool-1-thread-4] DEBUG org.sperbolink.utils.CodecUtils - command string: -ac 
2023-10-25 16:21:52,452 224257 [pool-1-thread-4] DEBUG org.sperbolink.utils.CodecUtils - command string: 1 
2023-10-25 16:21:52,452 224257 [pool-1-thread-4] DEBUG org.sperbolink.utils.CodecUtils - command string: -af 
2023-10-25 16:21:52,452 224257 [pool-1-thread-4] DEBUG org.sperbolink.utils.CodecUtils - command string: "atempo=1.4,volume=1.4" 
2023-10-25 16:21:52,452 224257 [pool-1-thread-4] DEBUG org.sperbolink.utils.CodecUtils - command string: "/home/todd/aggregator/processed/Downrange Radio/Downrange_Radio_2023-02-15_The_Avidity_PD-10_Delivers_.mp3"


  


  And the manually constructed and run command line that DOES work is :

  


  /bin/ffmpeg -y -i "/home/todd/aggregator/incoming/Downrange Radio/Downrange_Radio_2023-02-15_The_Avidity_PD-10_Delivers_.mp3" -ac 1 -af "atempo=1.4,volume=1.4" "/home/todd/aggregator/processed/Downrange Radio/Downrange_Radio_2023-02-15_The_Avidity_PD-10_Delivers_.mp3"


  


  The ffmpeg.log file is empty, so I'm doubting whether FFMPEG is ever being reached.

  


  What am I doing wrong ?

  


  EDIT :
I changed the commands to be

  


  "/bin/ffmpeg 2> foo.txt" 


  


  and the execution code to :

  


      ProcessBuilder processBuilder = new ProcessBuilder( commands );
//        processBuilder.redirectErrorStream( true );
    //  Added the next line to see if I could log an error from ffmpeg
//        processBuilder.redirectOutput( ProcessBuilder.Redirect.appendTo( new File( "./ffmpeg.log" ) ) );
        Process process = processBuilder.start();
        results = process.waitFor();


  


  Running that command from the command line displays a list of MMPEG commands that can be run within foo.txt. Upon running from within the Java app, the foo.txt file is empty, so it doesn't appear that FFMPEG ever gets reached. But, I'm clueless why not.

  


  EDIT 2 :
I converted the /bin/ffmpeg path to uppercase to see if that would return an error and it did.

  


  ERROR org.mrpc.utilities.ShellUtils - Cannot run program "/BIN/FFMPEG": error=2, No such file or directory


  


  This seems to confirm that the Java Process object can locate ffmpeg successfully when it is properly cased (i.e. my original code) as I don't see an error message when the case is incorrect. Still not sure why nothing happens when it is called.

  


  EDIT 3 :
I punted on this a year ago, but recently had to revisit. This time I found the answer. It is because I included double quotes around some of the command parameters. That caused the files to not be found. This link states that the Process class handles embedded spaces without any intervention required by you : ProcessBuilder adds extra quotes to command line

  


• Updated demo HTML files to use HTML5 doctype

  3 avril 2012, par Max Lynch

  m demo/ajaxSubmit-intergration-demo.html m demo/custom-messages-metadata-demo.html m demo/custom-methods-demo.html m demo/dynamic-totals.html m demo/errorcontainer-demo.html m demo/example.html m demo/index.html m demo/radio-checkbox-select-demo.html Updated demo HTML files to use HTML5 (...)