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• ffmpeg commands execution failed when run from Java. Executed successfully when the command is run in the terminal

  28 septembre 2022, par Kaung Myat Khaing

  I'm working on a java project which works with audio file manipulation(I'm newbie to Java). I want to get the start and end time of silence in the audio with ffmpeg "silencedetect" audio filter and write the results to a text file.
I run the filter command within the following function, but it always result in failure(prints "Silence Detection failed"). Then, I tried running the command in the terminal and it was successful(prints "Silence Detection successful"). I don't know what's wrong with my java code. I have other functions which execute other ffmpeg commands with the same flow as provided, but they works fine.
Here's the function.

  


  public static void getSilence(String filePath) throws InterruptedException, IOException {
        //                detect silence
        System.out.println("Silence Detection cmd: ffmpeg -i " + filePath
                + " -af silencedetect=d=1:noise=-60dB -f null - |& awk '/silencedetect/ {print $4,$5}' > "
                + SOURCE_PATH + "/silence_detections/silenceInfo.txt");
        Process silenceDetect = Runtime.getRuntime().exec("ffmpeg -i " + filePath
                + " -af silencedetect=d=1:noise=-60dB -f null - |& awk '/silencedetect/ {print $4,$5}' > "
                + SOURCE_PATH + "/silence_detections/silenceInfo.txt");

        if (silenceDetect.waitFor() == 0) {
            System.out.println("Silence Detection successful");
        } else System.out.println("Silence Detection failed");
    }


  


• Command works on terminal but not with Kotlin

  9 novembre 2019, par Antony

  I’m trying to use an FFMPEG command for concatenating different videos. The command is

  ffmpeg -i video.mp4 -i video-2.mp4 -filter_complex "[0:v:0] [0:a:0] [1:v:0] [1:a:0] concat=n=2:v=1:a=1 [v] [a]" -map "[v]" -map "[a]" output.mp4

  This command works good when I run on Windows PowerShell. But when I try to run with Kotlin code it doesn’t work.

  val firstVideo = "D:\\Videos\\ffmpeg\\video.mp4"
  
  val secondVideo = "D:\\Videos\\ffmpeg\\video-2.mp4"
  
  val resultPath = "D:\\Videos\\ffmpeg\\result-2.mp4"
  
  
  
  val cmd = "ffmpeg -i $firstVideo -i $secondVideo -filter_complex \"[0:v:0] [0:a:0] [1:v:0] [1:a:0] concat=n=2:v=1:a=1 [v] [a]\" -map \"[v]\" -map \"[a]\" $resultPath"
  
  .split(" ").toTypedArray()
  
  
  
  Runtime.getRuntime().exec(cmd)

  I’m not taking any error messages since I’m using FFMPEG cli.

  Also, this piece of Kotlin works perfect when I’m trying to run other FFMPEG operations.

• PHP FFMPEG command not working and working in terminal

  1er mars 2019, par Saurabh Sharma

  My FFMPEG path /usr/bin/ffmpeg
  My FFMPEG command

  $result = exec('/usr/bin/ffmpeg -i 1551361268_video.webm -i 
  
   1551361289_video.webm -i 1551361500_video.webm -i 1551361518_video.webm -i 
  
   1551361555_video.webm -i 1551361626_video.webm -i 1551361647_video.webm -i 
  
    1551361682_video.webm \
  
   -filter_complex "[0:v:0][0:a:0][1:v:0][1:a:0][2:v:0][2:a:0][3:v:0][3:a:0] 
  
   [4:v:0][4:a:0][5:v:0][5:a:0][6:v:0][6:a:0][7:v:0] 
  
   [7:a:0]concat=n=8:v=1:a=1[outv][outa]" \
  
   -map "[outv]" -map "[outa]" php.mkv');

  When I run this code nothing happens. I’m using centos 7. If I run this command on terminal, This works fine.