Recherche avancée

Sur d’autres sites (3911)

• ffmpeg Windows stream desktop real time to web

  14 avril 2019, par ilapasle

  Hello i want to stream my Windows desktop in realtime with ffmpeg

  for capture desktop i use this code :

  ffmpeg.exe -f gdigrab -framerate 60 -i desktop output.mkv

  it’s work

  Now i not want to record video of my desktop but stream my desktop and view this in web browser.
  i need to export stream video in m3u8 file

  i have use this code :

  ffmpeg.exe -f gdigrab -framerate 60 -i desktop -c:v libx264 -crf 18 -maxrate 400k -bufsize 1835k -pix_fmt yuv420p -hls_time 10 -hls_wrap 6 output.m3u8

  in my current dir i have 6 ts file and output.m3u8 but i can not open output.m3u8 file, the file is empty why ?

  i want to read this file in web browser like this code :

      
  
  
  
  
  
  
  
  <div>
  
  <video autoplay="true" controls="controls" width="640" height="480">
  
  <source src="output.m3u8" type="application/x-mpegURL"></source>
  
  Your browser does not support HTML5 streaming!
  
  </video>
  
  </div>

  thanks for advance for your help

• Upload ffmpeg file output to AWS s3 using NodeJS

  29 janvier 2020, par Durrani

  The ffmpeg.output("path/file.mp4") need a string path as an argument to write the output file to it. But s3 bucket.upload(parms, ...) need a Binary File as a value to the Body: in parms JSON

  Problem : Unable to provide file data using the file path to s3 bucket in NodeJS Environment

  FFmpeg()
  
    .input("source.mp4") //video
  
    .setStartTime(startTime)
  
    .setDuration(duration)
  
    .output(output)    //output file path: string
  
    .on("end", function() {
  
      console.log("Processing finished successfully");
  
      var params = {
  
        Bucket: process.env.S3_BUCKET,
  
        Key: "videos/filename.mp4",
  
        Body: output    //binary file data to be provided not file path
  
      };
  
      const bucket = new S3({
  
        accessKeyId: process.env.S3_ACCESS_KEY_ID,
  
        secretAccessKey: process.env.S3_SECRET_ACCESS_KEY,
  
        region: process.env.S3_REGION
  
      });
  
      bucket.upload(params, function(err, data) {
  
        console.log(err, data);
  
      });
  
    })
  
    .run();

• Video Seek Scroll (60FPS)

  9 avril 2022, par Enijar

  Trying to achieve an effect of seeking through a video when the page is scrolled. This has been achieved by exporting all frames of the video to JPEG images, pre-loading the images, and rendering them to a canvas. However, this approach uses a lot of bandwidth and takes a long time to load on slow networks.

  


  Trying to achieve the same effect by rendering a video to a canvas does not play as smoothly as the image-based approach.

  


  Here is a working demo with the video-based approach :

  


  https://codesandbox.io/s/infallible-chaum-grvi0r?file=/index.html

  


  Since HTMLMediaElement.fastSeek() doesn't have widespread browser coverage, how can one achieve a realtime playback rate of 30-60 FPS ?

  


  Here is the relevant code for the effect (see CSB link above for the full code) :

  


  const video = document.querySelector("video");
const canvas = document.querySelector("canvas");
const ctx = canvas.getContext("2d");

(function tick() {
  requestAnimationFrame(tick);

  const { scrollHeight, clientHeight, scrollTop } = document.body;
  const maxScroll = scrollHeight - clientHeight;
  const scrollProgress = scrollTop / maxScroll;

  canvas.width = document.body.clientWidth;
  canvas.height = document.body.clientHeight;

  // This is the line that causes the issue
  video.currentTime = video.duration * scrollProgress;

  ctx.clearRect(0, 0, canvas.width, canvas.height);
  ctx.drawImage(video, 0, 0, canvas.width, canvas.height);
})();