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• record video from website using puppeteer + ffmpeg

  8 novembre 2020, par rudolfninja

  I'm trying to record video from website using the way similar to puppeteer-recorder, but I want to stop recording by myself and then save it to file (after I stopped it). I wrote simple web service for this purpose :

  


  var express = require('express');
var app = express();
const { spawn } = require('child_process');
const puppeteer = require('puppeteer');
var record = true;


app.get('/startRecord', function (req, res)
{
const frun_record = async () => {
    console.log("Start recording");
    const browser = await puppeteer.launch();
    const page = await browser.newPage();
    await page.goto('http://worldfoodclock.com/', { waitUntil: 'networkidle2' });
    var ffmpegPath = 'ffmpeg';
    var fps = 60;

    var outFile = 'E:\\Code\\video-record\\output.webm';

    const args = ffmpegArgs(fps);

    args.push(outFile);

    const ffmpeg = spawn(ffmpegPath, args);

    const closed = new Promise((resolve, reject) => {
        ffmpeg.on('error', reject);
        ffmpeg.on('close', resolve);
    });

    console.log("Entering loop");

    while (record) {
        let screenshot = await page.screenshot({ omitBackground: true });
        await write(ffmpeg.stdin, screenshot);
    }
    ffmpeg.stdin.end();
    console.log("Recording stopped");
    await closed;
};
frun_record();
res.end( "starting recording" );
})

app.get('/stopRecord', function (req, res) {
 record = false;
 res.end( "stopped" );
})

const ffmpegArgs = fps => [
  '-y',
  '-f',
  'image2pipe',
  '-r',
  `${+fps}`,
  '-i',
  '-',
  '-c:v',
  'libvpx',
  '-auto-alt-ref',
  '0',
  '-pix_fmt',
  'yuva420p',
  '-metadata:s:v:0',
  'alpha_mode="1"'
];

const write = (stream, buffer) =>
    new Promise((resolve, reject) => {
        stream.write(buffer, error => {
            if (error) reject(error);
            else resolve();
        });
    });

var server = app.listen(8081, function () {
var host = server.address().address
var port = server.address().port
console.log("Example app listening at http://%s:%s", host, port)
})


  


  But it always record only 1 second video, looks like stream is just overwritten. I tried just save screenshots on disk and it was more than 1 second of video.
So the main question is how to put all the screenshots into the stream and then save it on disk ? And another thing I'd like to know is what the frequency of taking screenshots from web page ?

  


• Livestream screen capture to frontend website with low latency [closed]

  3 juin 2021, par Eddie Huang

  for a project I want to livestream my desktop on my Ubuntu server onto the frontend website (running on the same server using Node/Express).

  


  It would be the same effect as livestreaming with OBS/ffmpeg to Youtube/Twitch and embedding into my own website.&#xA;It has to be low latency (<1 second)

  &#xA;

  Could anyone point me in what protocols/applications/tutorials to use as an outline ?

  &#xA;

• Forwarding rtsp feed from one local port to another

  11 août 2021, par Thabet Sabha

  so let's say I have an rtsp server running on port 554, and when a certain command is received, i want the rtsp server to start forwarding the feed (using rtsp+tcp) to a service running on the same machine but on port 553 (Linux OS), is that possible via a CL command, or do I have to use something like ffmpeg ?

  &#xA;

  currently this is what is being used, but I feel like this is redundant since all we're doing is just forwarding the feed to another port on the same machine.

  &#xA;

  const ffmpegOptions = [
"-rtsp_transport", "tcp",
"-i", "rtsp://127.0.0.1:554",
"-codec", "copy",
"-f", "rtsp",
"-rtsp_transport", "tcp",
"rtsp://127.0.0.1:553"
]

const myProcess = spawn('ffmpeg', ffmpegOptions);


  &#xA;

  Thanks.

  &#xA;