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• synchronize android ffmpeg asyncTask in thread

  28 juin 2018, par Junburg

  I’m currently working on cutting and pasting audio with ffmpeg on Android. The problem is that when one audio file is not finished, there are other working files that need to be executed. I think the error below means this. I work through threads. An expression that executes a thread whenever there is a file to be processed.

  W/System.err: com.github.hiteshsondhi88.libffmpeg.exceptions.FFmpegCommandAlreadyRunningException: FFmpeg command is already running, you are only allowed to run single command at a time
  
  W/System.err:     at com.github.hiteshsondhi88.libffmpeg.FFmpeg.execute(FFmpeg.java:63)
  
                at com.github.hiteshsondhi88.libffmpeg.FFmpeg.execute(FFmpeg.java:89)
  
                at com.softcode.tablet.Mp3Concat_Thread$2.run(Mp3Concat_Thread.java:614)
  
                at java.lang.Thread.run(Thread.java:762)

  So what I want to ask is how to synchronize if a file comes in when the thread’s work is not over yet. Since the ffmpeg object is created with a singleton pattern, it seems that you will not be able to create a new object for each operation.

  If you know the answer, I would appreciate your reply.

  ** The asyncTask that runs ffmpeg is running in a thread. And I think the point is that the ffmpeg object is created as a singleton. When the work file comes in, the same thread is still running.

• ffmpeg write file in different thread

  5 avril 2018, par hagor

  In my application I recieve a stream from axis camera using rtsp streaming in ffmpeg(already implemented).

  There are many examples how to write a file using ffmpeg, but i have some fundamental questions :

  Does it make sense to write a file in a different thread than recieving thread ?

  Can I write packets i recieve and then read them once again ?

  Does it make sense to record in YUV format to save computations and data size ?

  May I use std::shared_ptr instead of AVContext* ? Does it slow the programm overall ?

  Thank you.

• I use the bramp/ffmpeg-cli-wrapper of java. How to terminate the execution in the thread ?

  8 mars, par Hao Tan

  I want to use ffmpeg to achieve streaming function

  


  First I created a thread pool

  


   private final Map taskThreads = new ConcurrentHashMap<>();
Thread taskThread = new Thread(() -> {
            try {
                private void startTask(Device task) {
        Thread taskThread = new Thread(() -> {

            FFmpegBuilder builder = new FFmpegBuilder()
                    .setInput(source) 
                    .overrideOutputFiles(true)
                    .addOutput(destination) 
                    .setFormat("flv")
                    .addExtraArgs("-c", "copy") 
                    .done();

            FFmpegExecutor executor = new FFmpegExecutor(ffmpeg, ffprobe);
            executor.createJob(builder).run();
        });
        taskThreads.put(task.getId(), taskThread);
        taskThread.start();
    }


  


  stop code

  


  public void stopTask(Integer taskId) {
        Thread taskThread = taskThreads.get(taskId);
        if (taskThread != null) {
            taskThread.interrupt(); 
            taskThreads.remove(taskId);
            
            DeviceDto task = deviceService.findById(taskId);
            if (task != null) {
                task.setIsOnline(0);
                Device device = new Device();
                BeanUtils.copyProperties(task,device);
                deviceService.update(device);
            }
        }
    }


  


  I call stopTask and cannot terminate the ffmpeg thread

  


  It should be executor.createJob(builder).run(); blocked

  


  How to solve