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• Passing FFMpeg Options into FrameGrabber Has No Effect At All

  29 janvier 2019, par peter bence

  I’m using FFMpegFrameGrabber on android to consume an rtmp live stream, that streams at 30fps, i tried to set the grabber frame rate using setFrameRate(4) and setOption("framerate","4"), in order to resolve the lag, but neither worked. I also passed a set of options into the grabber such as ("fflags","nobuffer") that seems to be working for others, but non has an effect too. I

      grabber = FFmpegFrameGrabber.createDefault(this.listener.getVideoUrlOrPath());
  
  
  
      grabber.setTimeout(Math.abs((int) GlobalHandler.configMnger.getConnectionTimeout() / 1000));
  
      grabber.setOption("fflags", "nobuffer");
  
      grabber.setOption("nobuffer", "1");
  
      grabber.setOption("max_delay", "0");
  
      grabber.setOption("hwaccel", "auto");
  
      grabber.setOption("vsync", "0");
  
      grabber.setOption("r", "4");
  
      grabber.setOption("preset", "ultrafast");
  
      grabber.setOption("tune", "zerolatency");
  
      grabber.setOption("analyzeduration", "0");
  
      grabber.setOption("fflags", "flush_packets");
  
      grabber.setOption("fflags", "nofillin");
  
      grabber.setOption("fflags", "noparse");
  
      grabber.setOption("flags", "low_delay");
  
      grabber.setOption("framedrop", "1");
  
      grabber.setOption("fflags", "discardcorrupt");
  
      grabber.setOption("framerate", "4");
  
      grabber.setFrameRate(4);
  
      grabber.setVideoCodec(avcodec.AV_CODEC_ID_H264);
  
  
  
  
  
      grabber.start();
  
  
  
      Frame image;
  
  
  
      while((image=grabber.grabImage())!=null){
  
          ...
  
      }

  Please Note that remove all options gives identical results, where the only working option i have here is timout that is set using the setTimeout function above.

  Any help please ?. Thanks !!

• How to make doppler effect on audio with ffmpeg [duplicate]

  3 janvier 2019, par Adam Estel

  This question already has an answer here :

  • FFmpeg : How to create rotating 3D(haas) effect in mp3 using ffmpeg ?
    
    1 answer
    

  How can i make the doppler effect on audio with ffmpeg.I mean : Sound run from left to right and opposite, just like this video :
  https://www.youtube.com/watch?v=j35K4QC_9bM
  I research ffmpeg for a while but I can’t firgure the audio filter i can start with
  Thank you for helping me
  Have a nice day.

• How to add Text with transition effect to video with ffmpeg ? [duplicate]

  2 octobre 2018, par Bhavik Rathod

  This question already has an answer here :

  • ffmpeg moving text drawtext
    
    1 answer
    

  I want to add text in video like subtitles, i know how to add text to video, now i want to add text with transition effects like presentation. How can i do that with using FFMPEG PHP. Is there any other possibilities to achieve that ? Thanks in advance

  Below is example of effect i wan’t to achieve