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• Merge remote-tracking branch ’qatar/master’

  27 décembre 2013, par Michael Niedermayer

  Merge remote-tracking branch ’qatar/master’
  * qatar/master :
  
    doxy : Update the css to have a flat style
  Merged-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] doc/doxy/doxy_stylesheet.css

• Broadcasting using Python [on hold]

  8 octobre 2018, par Aayush Tyagi

  I want to broadcast video processed using opencv after performing object detection so that multiple users can simultaneously see video on their browser.
  Can you please suggest how can I push frames to server and which server I can use for broadcasting purpose ?

  Also can you please point to some reference material or module that will help.

  (I am planning to use adaptive bit-rate streaming )

  PS :(I am using python on Ubuntu system and I am new in this domain)

• How do I access ffmpeg stdout as a buffer stream in node js

  15 octobre 2022, par Radespy

  I'm trying to access the output of an ffmpeg command (run with spawn in nodeJS) so that I can store the processed video in a buffer.

  


  I've tried the following code :

  


  (videoBuffer = [Unit8Array])

let arr = [];

let ffmpegSpawn = spawn(ffmpegPath, [
    "-i",
    "-",
    "-filter:v",
    "crop=500:500:50:50",
    "-preset",
    "fast",
    "-f",
    "mp4",
    "-",
  ]);

  ffmpegSpawn.stdin.write(videoBuffer);
  ffmpegSpawn.stdin.end();

  ffmpegSpawn.stdout.on("data", (chunk) => {
    console.log(chunk.toString());
    arr.push(chunk)
  });

  ffmpegSpawn.stderr.on("error", (err) => {
    console.log(err);
  });

  ffmpegSpawn.stdout.on("close", () => {
    console.log(arr)
  });



  


  No error is being produced but I can't see any output in the console other than an empty array.

  


  The ffmpeg command is successfully receiving the input via child_process.stdin and the [ "-i", "-" ...] args because I'm able to successfully create a test .mp4 file by passing the following args into ffmpeg (using spawn) :

  


  [
    "-i",
    "-",
    "-filter:v",
    "crop=500:500:50:50",
    "-preset",
    "fast",
    "./desktop/testVideo.mp4"
  ]


  


  I've tried accessing the child_process directly with :

  


  ffmpegSpawn.on("data", (chunk) => { arr.push(chunk); console.log(chunk.toString()})


  


  but nothing is seen on the console.

  


  Q : How do I access ffmpegSpawn.stdout ? As no error is being produced, I am assuming that the arguments to ffmpeg are valid.

  


  Why is the array empty ?

  


  Any help would be much appreciated.