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• Why a batch processing of ffmpeg is freezing the system ?

  3 septembre 2019, par Krishna Chebrolu

  I have a requirement of splitting smaller chunks of videos from 50+ mp4 source files for 5000+ records. Each record may result in 2 or 3 smaller chunks from as many source files out of those 50+.

  The logic to determine which source file to be picked up is written in Java and then fed to ffmpeg on Runtime.getRuntime().exec() using ExecutorService with newFixedThreadPool as below :

  private static boolean processqueue(ArrayList<string> cmds) {
  
      final ExecutorService pool;
  
      int threadsnum = Runtime.getRuntime().availableProcessors()-2;
  
      pool = Executors.newFixedThreadPool(threadsnum);
  
  
  
      for(final String cmd: cmds){ 
  
          pool.execute(new Runnable() {
  
              public void run() {
  
                  System.out.println(cmd);
  
                  try {
  
                      Runtime.getRuntime().exec(cmd);
  
                  } catch (IOException e) {
  
                      e.printStackTrace();
  
                      pool.shutdown();
  
                  }
  
              }
  
          });
  
      }                   
  
      pool.shutdown();
  
  
  
      // wait for them to finish for up to one minute.
  
      try {
  
          if(!pool.awaitTermination(1, TimeUnit.MINUTES)) {
  
              pool.shutdownNow();
  
          }
  
  
  
          //Wait a while for tasks to respond to being cancelled
  
          if(!pool.awaitTermination(1, TimeUnit.MINUTES))
  
              System.err.println("Pool did not shutdown properly");
  
  
  
      } catch (InterruptedException e) {
  
          e.printStackTrace();
  
          pool.shutdownNow();
  
          //Preserve interrupt status
  
          Thread.currentThread().interrupt();
  
          return false;
  
      }                   
  
  
  
      return true;
  
  }
  
  </string>

  the String cmd value is one of these based on split or merge requirement :

  for split :

  ffmpeg -y -ss 00:00:00 -t 00:08 -i E:/tmp/fin12.mp4 -acodec copy -vcodec copy E:/tmp/Intermed/0136f.mp4

  or

  for merge :

  ffmpeg -y -i E:/tmp/Inter/0136c0.mp4 -i E:/tmp/Inter/0136c1.mp4 -i E:/tmp/Inter/0136f.mp4 -i E:/tmp/Jingle.mp4 -i E:/tmp/wm1280.png -filter_complex "[0:v][0:a][1:v][1:a][2:v][2:a][3:v][3:a]concat=n=4:v=1:a=1[vv][a];[vv][4:v]overlay=x=0:y=H-overlay_h[v]" -map "[v]" -map "[a]" E:/tmp/final/0136.mp4

  On first attempt, only 250 records were processed. And, on subsequent attempt of balance records processing, it threw below exception ; but, processed another 300 records :

  java.io.IOException: Cannot run program "ffmpeg": CreateProcess error=1455, The paging file is too small for this operation to complete
  
  at java.lang.ProcessBuilder.start(Unknown Source)

  And, this code freezes often. Why is ExecutorService not holding up the queue to process all the records and exit gracefully ? What am I doing wrong ?

  Note : I’m calling Java class from windows batch script by passing relevant arguments which is executed from command line.

• Setting duration is not working in ffmpeg

  7 mai 2014, par Stepan

  Have problem with creating video from 50 png files in ffmpeg in shell.
  Setting duration -t 5 and fps -r 10

  ffmpeg -i image%d.png -y -pix_fmt yuv444p -r 10 -t 5 -s 1920:1080 out.mp4

  Final duration is 2 seconds and fps is 25.

  How to set it correctly ?

  I’m running at elementaryOS, ffmpeg version 0.8.10-4

  Thanks

• how to remove PTS gap within a file when transcoding with ffmpeg ?

  18 juillet 2017, par jsBaek

  i have a video which is from rtmp streaming.

  Since the broadcasting is on and off frequently,

  the archived file has PTS like below

  (assume that this is sec)

  0—10—20—30—40 120—130—140

  there’s discontinuity between 40 and 120 sec.

  duration of this file must be 60sec since there’s 80sec gap between 40 120.

  but when i transcoded this file, final duration became 140sec with 80sec of pausing parts.

  how can i transcode this file without "not existing" 80 sec so that output file became 60sec without redundant pausing 80 sec.

  i tried "+getpts" or "+igndts" options but they don’t work at all.