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• create video chunks with giving start and end time using ffmpeg and play those chunks sequentially with expiry time for each chunk using java

  4 octobre 2018, par JAVA Coder

  I have done like this I found it from the given link Just modified the code for start and end time and hard coded the times.
  Split video into smaller timed segments in Java

  @RequestMapping(value="/playVideo",method = RequestMethod.GET)
  
  @ResponseBody
  
  public void playVideo() {
  
      System.out.println("controller is working");
  
      int videoDurationSecs = 1800 ;
  
      int numberOfChunks = 5;//dynamically we can define according to video duration
  
       int chunkSize = videoDurationSecs/(numberOfChunks);
  
          int startSecs = 0;
  
          for (int i=0; i/*******Create video chunk*******//
  
  
  
              String startTime = convertSecsToTimeString(startSecs);
  
              int endSecs = startSecs+chunkSize;
  
              startSecs = endSecs+1; 
  
              if (endSecs > videoDurationSecs) {
  
                  //**make sure rounding does not mean we go beyond end of video**//
  
                  endSecs = videoDurationSecs;
  
              }
  
              String endTime = convertSecsToTimeString(endSecs);
  
  
  
              System.out.println("start time for-------------------->>>> "+startTime);
  
              System.out.println("end time for------------------->>>> "+endTime);
  
  
  
              /*
  
               * how to do this means send times for chunk and 
  
               * getting chunks and play them one by one like one video 
  
               * with expiry time for each
  
               */
  
  
  
  
  
              //Call ffmpeg to create this chunk of the video using a ffmpeg wrapper
  
              /*String argv[] = {"ffmpeg", "-i", videoPath, 
  
                      "-ss",startTime, "-t", endTime,
  
                      "-c","copy", segmentVideoPath[i]};
  
              int ffmpegWrapperReturnCode = ffmpegWrapper(argv);*/
  
          }
  
  
  
  
  
  }
  
  
  
  private String convertSecsToTimeString(int timeSeconds) {
  
      //Convert number of seconds into hours:mins:seconds string
  
      int hours = timeSeconds / 3600;
  
      int mins = (timeSeconds % 3600) / 60;
  
      int secs = timeSeconds % 60;
  
      String timeString = String.format("%02d:%02d:%02d", hours, mins, secs);
  
      return timeString;
  
  }

  }

• mp4 muxing problems on dm365 board

  25 mai 2013, par Ulterior

  I happen to be stuck with strange TI codec issues while encoding video. To cut story short - the encoded data which is generated by TI mpeg4 codecs are not 'understood' by nothing else, but VLC and media classic player.

  After really long googling and several seasons I face to you stackoverlowers to help me understand what is wrong in the encoded frame headers, because I really fail to find any answers.

  AviDemux 2.6.1 opens and remux-es video data without problems. So there is hope to understand whats is wrong with mp4 generated data...

  I would really appreciate any help from mp4 gurus out there...

  the link to the problem file

• merging audio files using FFmpegFrameRecorder

  21 octobre 2018, par Sargam Modak

  I have successfully merged(not concatenate) two .aac audio files using ffmpegframerecorder but the output file is like very slow.
  Below is the code i have used.
  Is there anything i can use to speed up the output audio file. Is it related to framerate ?

  FFmpegFrameGrabber frameGrabber =
  
                  new FFmpegFrameGrabber("storage/sdcard0/Audio/audio.aac");      
  
          f=new File("/storage/sdcard0/Audio/audnew.aac");
  
          try {
  
              f.createNewFile();
  
          } catch (IOException e2) {
  
              // TODO Auto-generated catch block
  
              Log.d("def",e2.getLocalizedMessage());
  
          }
  
         FFmpegFrameGrabber grabber1 = new FFmpegFrameGrabber("/storage/sdcard0/Audio/smoke.aac");
  
          try {
  
              frameGrabber.start();
  
              grabber1.start();
  
          } catch (org.bytedeco.javacv.FrameGrabber.Exception e1) {
  
              // TODO Auto-generated catch block
  
              Log.d("here",e1.getLocalizedMessage());
  
          } 
  
          FFmpegFrameRecorder recorde = new FFmpegFrameRecorder(f, frameGrabber.getAudioChannels());
  
          try {
  
              recorde.setAudioCodec(AV_CODEC_ID_AAC);
  
              Log.d("12","here");
  
              recorde.setFrameRate(12);
  
              recorde.start();
  
              Frame frame1 = new Frame();
  
              Frame frame2 = new Frame();
  
              for (int i=0;i<1000000;i++)
  
              {
  
                  frame1 = grabber1.grabFrame();
  
                  frame2 = frameGrabber.grabFrame();
  
                  if (frame1==null || frame2==null) {
  
                      Log.d("er","Failed cvQueryFrame");
  
                      frameGrabber.release();
  
                      grabber1.release();
  
                      break;
  
                  }
  
                  recorde.record(frame1);
  
                  recorde.record(frame2);
  
  
  
              }
  
              recorde.stop();
  
              grabber1.stop();
  
  
  
          }catch(Exception e){
  
              Log.d("abc", e.getLocalizedMessage());
  
          }