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• Convert audio download with youtube-dl to flac ?

  28 janvier 2020, par Urasam

  Is it possible to download a YouTube video as e.g. mp3 and then convert it to flac with ffmpeg ? I can specify the arguments that ffmpeg shall use after the download with —postprocessor-args but I don’t know how to get the file name there.

  --postprocessor-args "-i downloadedfile.xxx -c:a flac downloadedfile.flac"

  This would be the argument I want to use. Is this possible ?

• 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

• libavfilter - reconfigure filter graph using avfilter_graph_parse_ptr returns -22

  16 juillet 2021, par Rahul

  I am using transcode.c sample from ffmpeg examples and it is working as expected. It uses avfilter_graph_parse_ptr to setup filter graph and it works fine.

  


  However, I need change filter graph dynamically and there avfilter_graph_parse_ptr fails. It returns -22. I am not certain if it is a valid operation to do (reconfigure) ? If it is possible, does it require more than avfilter_graph_parse_ptr and avfilter_graph_parse_ptr ? libavfilter documentation doesn't say anything about reconfigure or reset existing graph.

  


  I can create a new graph but I am avoiding it since it is affecting the existing buffers.

  


  Thank you for your insight.