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• Javacv-ffmpeg : Getting audio data

  25 janvier 2013, par bmeric

  I'm trying to get audio data from a file(mp3, mp4 and 3gp). I can get frames but not the audio. Am i using wrong ffmpeg classes ?(I'm very new to ffmpeg)

      FFmpegFrameGrabber ff = new FFmpegFrameGrabber("/sdcard/cock_a_1.wav" );    
  
  try {
  
      ff.start();
  
      Frame frame;
  
      int i=0;
  
      while ((frame = ff.grabFrame()) != null) {
  
          if (frame.samples.hasArray())
  
              Log.e("frame", String.valueOf(i++));
  
      }
  
      ff.stop();

  How can i extract audio data array ?

• How can you extract the header data of an audio file using libav ?

  16 janvier 2024, par CheekyChips

  I'm using libav/ ffmpeg to transcode an audio file from one format to another in c++. I have written it in a way so that it works for receiving streamed audio, where first the header of an audio file is sent, followed by chunks of encoded audio.

  


  Now I'd like to generate some test files, where I separate an existing audio file into the header component, followed by chunks of encoded audio data, preferably frame aligned. (I would store this as base64 text for readability with each piece separated by some token, e.g. a newline character)

  


  Is it possible using ffmpeg/ libav to extract the raw data of the header of an audio file ? If not, does anyone have any suggestions for how I can find the point in the audio file between the header data and the audio data, so I can then split it at this point ?

  


  Note : actually if this is possible using the tool ffmpeg that would also be a viable solution

  


• Accessing data of fmmpeg while processing in node.js

  25 juin 2019, par newCOder2137ssh

  Im converting a .mp4 file with ffmpeg to a .mp3 file.I am only able to access this data after ffmpeg finished, but I want to access it while it is processing.

  I am currently using fluent-ffmpeg to process the video. This is how I process it :

  proc = new ffmpeg({
  
      source: stream
  
  })
  
  proc.withAudioCodec('libmp3lame')
  
      .toFormat('mp3')
  
      .seekInput(35)
  
      .output(audio)
  
      .run();

  I can access the data after ffmpeg fiinished with proc.on('end', ()) but I’d like to access the data while it’s processing and make a reeadable Stream out of it. Does someone know how to do that ?