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• How to save audio chunks from client to ffmpeg readable file ?

  22 septembre 2023, par LuckOverflow

  I am live recording audio data from a TS React front-end and need to send it to the server, where it can be saved to a file so that ffmpeg can mix it. The front-end saves the mic data to a blob with type "mimeType : "audio/webm ; codecs=opus" when printed in the browser terminal. I send the exact object that I printed to the server, where logging it indicates it is a, or was passed as a, "Buffer" object.

  


  I have tried saving that Buffer as a webm file, but when I pass that file as an input to ffmpeg ffprobe, I get the error "Format matroska,webm detected only with a low score of 1..." and "EBML header parsing failed.." "Invalid data found when processing input." I have tried several other formats to no success.

  


  I need a way to transform this Buffer object to an audio file that can be mixed by ffmpeg. When I am finished, I also need to be able to do the reverse operation to send it in the same format to another client for playback, which is currently working.

  


  Code that records and sends the audio (TS React) :

  


  React Record

  


  const startRecording = async function () {
    inputStream = await navigator.mediaDevices.getUserMedia({ audio: true });
   
    mediaRecorder.current = new MediaRecorder(inputStream, { mimeType: "audio/webm; codecs=opus" });

    mediaRecorder.current.ondataavailable = e => {
      console.log(e.data)
      if (e.data.size > 0) {
        socket.emit("recording", e.data);
        console.log("Audio data recorded. Transmitting to server via socketio...");
      }
    };

    mediaRecorder.current.start(1000);
  };



  


  Code that receives and tries to save the Buffer to a file (JS Node.js) :

  


  Server Receive

  


  socket.on("recording", (chunk) => {
    console_log("Audio chunk recieved. Transmitting to frontend...");
    socket.broadcast.emit('listening', chunk);

    fs.writeFileSync('out.webm', chunk.toString());
    if (counter > 3) {
      console.log("Trying ffmpeg...");

      ffmpegInstance
        .input('out.webm')
        .complexFilter([
          {
            filter: 'amix'
          }])
        .save('./Music/FFMPEGSTREAM.mp3');
    }

    counter++;
  });


  


  fluent-ffmpeg interface package is includued in the server code, but I have been using ffmpeg in the terminal (Pop OS) to debug. The goal is to save the file to a ram disk and use fluent ffmpeg to mix before sending to a different client for playback. Currently I am just trying to save it to disk and get ffmpeg command line to work on it.

  


  Update :
Problem was that the chunk I was analyzing didn't have the header info. MediaRecorder encodes, then slices it up, not slices it up into your specified time slot and encodes. I have not found a good solution to this. Saving the file, without toString I believe, results in a playable webm when the header is properly included.

  


• lavf/http.c : Free allocated client URLContext in case of error.

  12 janvier 2018, par Stephan Holljes

  lavf/http.c : Free allocated client URLContext in case of error.
  Signed-off-by : Stephan Holljes <klaxa1337@googlemail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/http.c

• Encode video using ffmpeg and vp8 codec on Native Client

  28 octobre 2015, par Victor Canezin de Oliveira

  I’m trying to develop a video encoder using Native Client.
  I want the output file to be .webm and I’m using ffmpeg example "muxing.c".

  When I run the example I get the error message : Could not find encoder for ’vp8’

  The error comes from here :

  *codec = avcodec_find_encoder(codec_id);
  
  if (!(*codec)) {
  
      fprintf(stderr, "Could not find encoder for '%s'\n",
  
              avcodec_get_name(codec_id));
  
  }

  Where codec_id value is AV_CODEC_ID_VP8

  When I put the output file to be .mp4 it works.

  Can someone help me.
  Do I need to enable vp8 encoder for ffmpeg naclport ?
  What should I do ?

  Thanks !!

  UPDATE

  @Lee Gi Gone :

  Yes. you must need to compile ffmpeg with libvpx library to encode
  vp8/vp9. you can install it via yum, apt. or you can compile it
  manually.

  Once libvpx is installed, install ffmpeg with libvpx in following
  command :

  ./configure --enable-libvpx 
  
  make -j 4
  
  make install

  I put the dependency for libvpx on build.sh and pkg_info on ffmpeg naclport and built it again. Now it works !