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• FFmpeg cannot recognize a preset even though it does exist Ubuntu 12.04

  6 septembre 2017, par Ahmad Tahboub

  I have installed ffmpeg and x264 folloowing the steps in this documentation :http://ffmpeg.org/trac/ffmpeg/wiki/UbuntuCompilationGuide

  Now I have this line to execute :

  sudo /usr/bin/ffmpeg -i input_file.flv -f flv -vcodec libx264 -vpre normal -r 25 -s 0x0 -aspect 1.7777777777778 -padcolor 000000 -padtop 0 -padbottom 0 -padleft 0 -padright 0 -acodec libfaac -ab 128000 -ar 22050 output_file.flv
  
  
  
  Input #0, flv, from 'WIN! Jwow.flv':
  
    Metadata:
  
      starttime       : 0
  
      totalduration   : 101
  
      totaldatarate   : 865
  
      bytelength      : 10897460
  
      canseekontime   : true
  
      sourcedata      : BD58B2E43HH1338284027987695
  
      purl            : 
  
      pmsg            : 
  
    Duration: 00:01:40.66, start: 0.000000, bitrate: 877 kb/s
  
      Stream #0.0: Video: h264 (Main), yuv420p, 640x360, 745 kb/s, 29.97 tbr, 1k tbn, 59.94 tbc
  
      Stream #0.1: Audio: aac, 44100 Hz, stereo, s16, 131 kb/s
  
  **File for preset 'normal' not found**

  I have the presets in the the following directories :

  /usr/share/ffmpeg
  
  /usr/local/share/ffmpeg
  
  /home/user/.ffmpeg
  
  /usr/local/src/ffmpeg/presets

  And still getting the same error : File for preset ’normal’ not found

  What is the problem here ?

  Extra info - this is what i get when i do ffmpeg -version

  ffmpeg version git-2012-05-31-60de761
  
  built on May 31 2012 15:54:11 with gcc 4.6.3
  
  configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-nonfree --enable-version3 --enable-x11grab

• NodeJS HLS stall initial m3u8 for playback

  7 mars 2016, par shreddish

  I have a nodejs server running, when user enters the follow address

  http://localhost:7070/udp/239.1.1.1:1234/out.m3u8

  My server starts an ffmpeg child process that connects to that UDP stream and converts it to HLS segmented files.

  In order to give FFMPEG a chance to begin and start creating the first out.m3u8 file I call the FFMPEG process and then immediately set a timeout of about 8 seconds before the server responds to the request for the .m3u8 file.

  Eventually the video will start to play but only get through 2-3 .ts files before playback stops and the browser stops requesting additional .ts files.

  When it’s stalled, if I hit refresh (since FFMPEG is still running) it doesn’t try to start ffmpeg and delay the response. Instead it just immediately serves up the files being requested and playback works fine.

  So I am thinking that clearly something to do with delaying my response for that long is mucking up the playback of the stream. Is there a better way to wait for FFMPEG to start generating the HLS files and respond ?

  Here is the part of the server that is delaying the response.

  // Check if ffmpeg is running yet, also check to see if user has switched to a different udp address
  
          if (filename == "out.m3u8" && (!ffmpegRunning || udpAddress != runningUDPAddress)) 
  
              {
  
                  runFFMPEG(filename, udpAddress);
  
                  setTimeout(function() { streamFile(req, res, uri, filename); return; }, 8000);
  
              }
  
              else
  
              {
  
                  streamFile(req, res, uri, filename);
  
              }

• Is there a way to stream download a mp3 file that is being converted on a nodejs server ?

  19 février 2019, par Thriskel

  I am looking for a way to send the url to the nodejs server and respond the user with the mp3 file download.

  I searched some examples, and read about requests and responses, but I am not sure what the problem really is.

  This is the Javascript for the HTML :

      var downloadBtn = document.querySelector('.download_button');
  
      var URLinput = document.querySelector('#myUrl');
  
  
  
      downloadBtn.addEventListener('click', () => {
  
          console.log(`URL: ${URLinput.value}`);
  
          sendURL(URLinput.value);
  
      });
  
  
  
      function sendURL(URL) {
  
          window.location.href = `http://localhost:4000/download?URL=${URL}`;
  
      }

  This is the Javascript for the Nodejs server :

  const express = require('express');
  
  const cors = require('cors');
  
  const ytdl = require('ytdl-core');
  
  const app = express();
  
  const ffmpeg = require('fluent-ffmpeg')
  
  app.use(cors());
  
  
  
  app.listen(4000, () => {
  
      console.log('Server Works !!! At port 4000');
  
  });
  
  
  
  app.get('/download', (req,res) => {
  
  var URL = req.query.URL;
  
  
  
  res.header('Content-Disposition', 'attachment; filename="file.mp3"');
  
  let stream = ytdl(URL, { 
  
    quality: 'highestaudio',
  
  }); //HERE THE STREAM FILE IS SELECTED TO BE CONVERTED TO MP3
  
  
  
  ffmpeg(stream)
  
    .audioBitrate(128)
  
    .pipe(res); // HERE IS CONVERTED AND WHERE I WANT IT TO SEND IT AS A DOWNLOAD TO THE USER.
  
  });

  I expected it to stream download the file but instead it gets me to the nodejs server page to /download/url_to_vid