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• Node.js, stream pipe output data to client with socket io-stream

  22 mai 2018, par Empha

  Sorry for a repeating topic, but i’ve searched and experimented for 2 days now and i haven’t been able to solve the problem.

  I am trying to live stream pictures every 1 second to a client via socket.io-stream using the following code :

  var args = [
  
      "-i",
  
      "/dev/video0",
  
      "-s",
  
      "1280x720",
  
      "-qscale",
  
      1,
  
      "-vf",
  
      "fps=1",
  
      config.imagePath,
  
      "-s",
  
      config.imageStream.resolution[0],
  
      "-f",
  
      "image2pipe",
  
      "-qscale",
  
      1,
  
      "-vf",
  
      "fps=1",
  
      "pipe:1"
  
  ];
  
  camera = spawn("avconv", args);    // avconv = ffmpeg

  The settings are good, and the process writes to stdout successfully. I capture all outgoing image data using this simplified code :

  var ss = require("socket.io-stream");
  
  camera.stdout.on("data", function(data) {
  
      var stream = ss.createStream();
  
      ss(socket).emit("img", stream, "newImg");
  
      // how do i write the data-object to the stream?
  
      // fs.createReadStream(imagePath).pipe(stream);
  
  });

  "socket" comes from the client using the socket.io-package, no problem there. So what i am doing is that i listen to the stdout-pipe for the "data" event. That data gets passed to the function above. That means that at this stage "data" is not a stream, its a "<buffer></buffer>code>"-object, and therefore i cannot stream it like i could previously using the commented createReadStream-statement where i read the image from disk. <strong>How do i stream the data (Buffer at this stage) to the client? Can i do this differently, perhaps not using socket.io-stream?</strong> "data" is just one part of the whole image, so perhaps two or three "data"-objects need to be put together to form the complete image.

  I tried using "stream.write(data, "binary") ;" which did transfer the Buffer-objects, problem is that there is not end of stream-event and therefore i do not know when an image is complete. I tried registering to stdout.on "close", "end", "finish", nothing triggers. Am i missing something ? Am i making it overly complex ? The reasoning behind my implementation is that i need a new stream for each complete image, is that right ?

  Thanks alot !

• Raspberry PI3 records video without quality from IP Camera

  22 avril 2018, par Marcos da Cruz Sibilio Jr.

  I try to record video using : raspberry pi 3, IP Camera and ffmpeg command.
  I installed ffmpeg by surce code for enable libx264 it works but not very well.
  I use the syntax (in raspberry command line) :

  ffmpeg -i "rtsp://192.168.100.108:554/user=admin&password=admin&channel=1&stream=0.sdp?" -t 00:01:00 -an -y -framerate 25 -vcodec:a copy -vcodec:a h264  video_teste.h264

  after that I copy the file for my notebook and run :

  MP4Box -fps 30 -add video_teste.h264 v.mp4

  after tha I can watch the video (v.mp4) but the image is like that :
  image by video recorded

  command ffmpeg retuns this lines :
  ffmpeg results

  I tried some configurations for ffmpeg, tried the resolution camera (D1 and 720p), tried to record with opencv (it is installed too).
  I need to record h264 video in raspberry Pi (I will use extern HD for record the videos) and transfer to my server by ftp, but it is necessary that the video quality is good.

• avformat/http: flushing tcp receive buffer when it is write only mode

  4 avril 2018, par Vishwanath Dixit

  avformat/http: flushing tcp receive buffer when it is write only mode
  In write only mode, the TCP receive buffer's data keeps growing with
  
  http response messages and the buffer eventually becomes full.
  
  This results in zero tcp window size, which in turn causes unwanted
  
  issues, like, terminated tcp connection. The issue is apparent when
  
  http persistent connection is enabled in hls/dash live streaming use
  
  cases. To overcome this issue, the logic here reads the buffer data
  
  when a file transfer is completed, so that any accumulated data in
  
  the recieve buffer gets flushed out.
  

  • [DH] libavformat/http.c