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• Streaming a video to multiple end users with node.js and ffmpeg

  9 juin 2023, par Nick Knapp

  I'm designed an API endpoint with node.js and express which will accept a url from a different part of the application, convert it into a webm stream, and allow multiple different end users to receive the end result without too much backend processing.

  


  I'd like to have the process running once and pipe the resulting stream to n endpoint calls without using temp files to hold it. So far, all of my attempts to store the output in a temporary object have failed.

  


  What would be the best method of going about doing this ?

  


  The following does not work, but is an example of what I've been trying to do.

  


  import express from 'express';
import cors from 'cors';
import FfmpegCommand from 'fluent-ffmpeg';
import stream from 'stream';

const app = express();
const port = 3002;
const activeStreams = {};

app.use(cors());

app.get('/video/stream', (req, res) => {

  var streamUrl = new URL(req.query.streamurl);
  var protocol = streamUrl.protocol;

  if (activeStreams[streamUrl] === undefined) {
    activeStreams[streamUrl] = new stream.Duplex();
    if (['udp:', 'rtmp:', 'rtsp:'].includes(protocol)) {
      FfmpegCommand(path)
      .toFormat('webm')
      .on('error', function(err, stdout, stderr) {
          console.log('an error occurred', err.message);
          console.log("stdout:\n" + stdout);
          console.log("stderr:\n" + stderr);
      })
      .pipe(activeStreams[streamUrl], {end: true});
    }
    activeStreams[streamUrl].read().pipe(res);
  } else {
    activeStreams[streamUrl].read().pipe(res);   
  }
});


  


• How can I allow my users to combine audio and video tracks for downloading a youtube video ? [closed]

  1er décembre 2023, par Faizan Ahanger

  I have a website which, along a bunch a text, has a embedded youtube videos to play. I want to allow my users to also a be able to download those videos. There are too many videos there to store on my own server and I know that there are already website like y2mate.com and savefrom.net which do this.

  


  I used yt-dlp and using the --print-json parameter I can get the urls for downloading the files but the audio and video tracks are not combined for higher videos. Using ffmpeg seems to be the obvious solution but I don't understand where the videos should be combined. Should I download both needed tracks on my server and combine them before serving it to users ? This seems very inefficient as it take a lot of bandwidth for handling all download requests. There is also this library ffmpeg.wasm which according to them is "a pure WebAssembly / JavaScript port of FFmpeg enabling video & audio record, convert and stream right inside browsers !"

  


  This should work but it will require the users to download a 30MB webapp before they can download any video. This is also not very efficient, especially if they are downloading a video which is only a few MBs in size.

  


  Are these the only two options that I have or is there a better way to do this ?

  


• lavu/log : Also print the log level for level trace.

  16 décembre 2019, par Carl Eugen Hoyos

  lavu/log : Also print the log level for level trace.
  

  • [DH] libavutil/log.c