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• How to convert a video to mask with ffmpeg?

  8 April 2019, by Zedd W

  I want to synthesize videos with a pre-designed template.

  template structure

  • background video: background
  • mask video: mask
  • foreground video: foreground
  • content video: content

  The final result is similar to the video below

  result : This video is synthesized by me using moviepy(a Python module for video editing). But it takes too long to be used in production.

  So, I need to overlay these videos into a single video.

  Current problems

  • How to convert a video to mask by ffmpeg?
  • How to synthesize these videos to a single video by ffmpeg?

• video compression error in android

  27 April 2017, by Arpan Sharma

  I am using ffmpeg for video compression in android.I an following this link
  But i always get exit code 1.I am trying to get video from VIDEO CAPTURE intent inside a fragment.
  This is my code

  final Clip clip_in = new Clip(videoPath);
  
          File fileTmp = activity.getCacheDir();
  
          File fileAppRoot = new File(activity.getApplicationInfo().dataDir);
  
  
  
          final Clip clip_out = new Clip(videoPath);
  
          //put flags in clip
  
          clip_out.videoFps = "30";
  
          clip_out.width = 480;
  
          clip_out.height = 320;
  
          clip_out.videoCodec = "libx264";
  
          clip_out.audioCodec = "copy";
  
  
  
          try {
  
              FfmpegController fc = new FfmpegController(getContext(), fileTmp);
  
              fc.processVideo(clip_in, clip_out, false, new ShellUtils.ShellCallback() {
  
  
  
                  @Override
  
                  public void shellOut(String shellLine) {
  
                      System.out.println("MIX> " + shellLine);
  
                  }
  
  
  
                  @Override
  
                  public void processComplete(int exitValue) {
  
                      if (exitValue != 0) {
  
  //                        System.err.println("concat non-zero exit: " + exitValue);
  
                          Log.d("ffmpeg", "Compilation error. FFmpeg failed");
  
                          Toast.makeText(activity, "result: ffmpeg failed", Toast.LENGTH_LONG).show();
  
                      } else {
  
                          if (new File("/storage/emulated/0/Developer/result2.mp4").exists()) {
  
                              Log.d("ffmpeg", "Success file:" + "/storage/emulated/0/Developer/result2.mp4");
  
                          }
  
                      }
  
                  }
  
              });
  
  
  
          } catch (Exception e) {
  
              // TODO Auto-generated catch block
  
              e.printStackTrace();
  
          }

  Any help will be appreciated.

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

  3 September 2019, by 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.