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• merging audio files using FFmpegFrameRecorder

  1er juin 2015, 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());
  
          }

• How to reduce jitter in gstreamer udp multicast. I can't make it less than 140ms. And who makes it so big. Demultiplexer or multiplexer. ffmpeg work

  4 septembre 2023, par Slava

  I need to feed a udp multicast stream to gstreamer. Make the conversion to audio without touching the video and output it again to udp multicast. The design is simple and it works. But the output is a very large 140ms jitter. How can I reduce the jitter. Here is the construction I use

  


  gst-launch-1.0 udpsrc uri="udp://224.0.191.147:1234" ! tsdemux name=tsdemux0 tsdemux0.video_0_03f3 ! queue ! h264parse ! mpegtsmux name=tsmux0 ! queue ! udpsink host=230.3.2.2 port=1234 auto-multicast=true ttl-mc=64 tsdemux0.audio_0_03f4 ! queue ! decodebin ! audioconvert ! audiokaraoke ! avenc_mp2 ! tsmux0.


  


  I tried to use various parameters but couldn't get a good result. Please help. I've been solving this problem for a week now

  


  This design works well. But I need it on gstreamer

  


  ./ffmpeg -threads auto -thread_type 1 -re -i "udp://224.0.191.147:1234?fifo_size=50000000&overrun_nonfatal=1" -filter_complex "aderivative" -max_delay 3000000 -max_muxing_queue_size 1000000 -muxrate 5000000 -c:v copy -f mpegts -muxrate 5M -pcr_period 20 -pat_period 0.10 -sdt_period 0.25 -metadata service_provider="My Provider" -metadata service_name="MyTV Channel" -metadata title="MyTV Channel" -metadata:s:a:0 language=rus -mpegts_flags +pat_pmt_at_frames -flags cgop+ilme -sc_threshold 1000000000  "udp://230.3.2.2:1234?pkt_size=1316&ttl=64&&bitrate=5000000&overrun_nonfatal=1"


  


  In ffmpeg, the -re parameter makes the jitter small. But I didn't find which parameter does the same in gstreamer

  


• Java Runtime exec() get stuck after a while

  20 décembre 2013, par codareee

  I'm building a simple UI for ffmpeg launching ffmpeg.exe with parameters using exec(). it works on Os X but on Windows 7-8 after few seconds the ffmpeg process suspends itself and resumes only when I kill the father process. (also ddlhost.exe is created)
  Ffmpeg.exe converts successfully the same video from cmd.

  Searching on the internet I've found this answer but I have the same problem running a simple test program which is not using the Input and Error streams.

  Here is the test program code which has the same problem of the main one :

  public class Main {
  
  
  
  static String param_ffmpeg_1 = "./data/ffmpeg.exe";
  
  static String param_ffmpeg_2 = "-i";
  
  
  
  static String in = "./data/source.mov";
  
  static String out = "./data/out.flv";
  
  
  
  static Process p;
  
  
  
  public static void main(String[] args) {
  
  
  
      /*File f = new File(out);
  
  
  
      if (f.exists()){
  
          f.delete();
  
      }*/
  
  
  
  
  
      Runtime rt = Runtime.getRuntime() ;
  
      //String cmd1 =  param_ffmpeg_1 + param_ffmpeg_2 +  in_path +  param_ffmpeg_3 + out_path ;
  
      System.out.println(in);
  
      System.out.println(out);
  
      String[] cmd1 = new String[] { param_ffmpeg_1, param_ffmpeg_2, in, "-ar", "44100", "-vb", "2500k", "-s", "882x496", "-f", "flv", out};
  
  
  
      try {
  
          p = rt.exec(cmd1);
  
      } catch (IOException e) {
  
          // TODO Auto-generated catch block
  
          e.printStackTrace();
  
      }
  
      int r = 123456;
  
      try {
  
          r = p.waitFor();
  
      } catch (InterruptedException e) {
  
          // TODO Auto-generated catch block
  
          e.printStackTrace();
  
      }
  
  
  
      System.out.println(r);
  
  
  
  
  
  }

  }