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• How to view the stream generated from mkvserver via ffplay ?

  18 juin 2019, par Chaitanya Bhardwaj

  I want to live stream from one source(ffmpeg) to multiple clients for which I’m using mkvserver.
  I’m able to live stream a webcam from ffmpeg(client) to mkvserver(server) as follows :

  On Server :

  nc -l  | ./server

  On Client :

  ffmpeg -f avfoundation -framerate 30 -i 0 -b 900k -f matroska -r 20 tcp://:

  To view the genereted steam on server, I used the ffplay as :

  ffplay tcp://:<port>
  
  </port>

  but I got the Connection timed out error. Please suggest a way to view the generated stream on the server via ffplay. Thanks !

• remuxing audio and videos (screen and presenter) captured at the same time does not synchronize

  22 septembre 2014, par user28163

  trying to merge a screencast with a video (without sound) and a sound steam which has been captured separately using ffmpeg using a bash command. All the stream-capture were started at the same time and all ffmpeg processes killed at the same time (pkill). But when I remux them together, the screencast and video does not match, and thus sound does not synchronize either.

  Where did I go wrong ? Any inputs appreciated from ffmpeg experts here. Thanks in advance.

  Please find the ffmpeg output as follows :

  1. The ffmpeg log of two videos muxing (http://pastebin.com/XwnDSf5i)
  2. The ffmpeg log of remuxing the sound with the side-by side video as of 1 above (cannot paste as the pastebin limit exeeded :( ).

  UPDATE :

  After checking the lenght of the screencast, I figured out that the screen capture (though started and stopped at the same time as video and sound using a bash script), is shorter in lenght by 1m54s than video and audio (former 34:22 vs later 36:16). The video was captured in h264 mp4 wrapper at -r 30. So is screen capture but lossless

  %ffmpeg -report -f x11grab -r 30 -s 1920x1080 -i :0.0 -qscale 0 -vcodec libx264 -threads 4 screen.m4v

  Could that be the reason for the delay ? Is there any way to extend the screencast against the videos ? Thanks !

• Download billboard hot 100 (but only 50) mp3 files

  4 mars 2021, par Atlas

  Yo yo yo. I got this insane idea to get 50 of the billboard hot 100 songs, download them into mp3 files, and then put them on private online radio.

  


  Problem is, the way I do it doesn't download each file one by one, it puts all the music together in one mp3 file. Here's my code so far (terrible, I know... I just wanna throw this together really quickly)

  


  const { getChart } = require("billboard-top-100");
const ffmpeg = require("fluent-ffmpeg");
const { mkdir } = require("fs");
const ytdl = require("ytdl-core");
const YT = require("scrape-youtube").default;

getChart('hot-100', (err, chart) => {
    if(err) console.log(err);
    chart.songs.length = 50;
    for (var i = 0; i < chart.songs.length; i++) {
        var song = chart.songs[i];
        song.artist = song.artist.replace("Featuring", "feat.");
        var name = `${song.artist} - ${song.title}`;
        YT.search(name).then(res => {
            downloadVideo(res.videos[0].link, name).then(_ => { console.log(""); }).catch(console.log);
        }).catch(err => console.log(err));
    };
});

function downloadVideo(url, name) {
    return new Promise((resolve, reject) => {
        var stream = ytdl(url, { filter: "audioonly", quality: "highestaudio" });
        var start = Date.now();

        ffmpeg(stream)
            .audioBitrate(128)
            .save(`${__dirname}/${new Date().getWeek()}/${name}.mp3`)
            .on("end", _ => {
                console.log(`Downloaded "${name}.mp3" - Took ${(Date.now() - start) / 1000} seconds.`);
                resolve(`${name}.mp3`);
            })
            .on("error", _ => reject("something went wong"));
    });
}

Date.prototype.getWeek = function() {
  var onejan = new Date(this.getFullYear(),0,1);
  return Math.ceil((((this - onejan) / 86400000) + onejan.getDay()+1)/7);
}