Sur d’autres sites (4142)

• How to add an album cover to an mp3 stream using FFmpeg ?

  29 décembre 2022, par Daniel LAPIDES

  I'm having a bit of an issue and I'd really appreciate it if I could get some insights.

  



  What I am trying to do is to add an album cover to the mp3 file that will be downloaded from the front-end.

  



  Context

  



  I'm downloading a video stream from YouTube and converting it to mp3 using fluent-ffmpeg.
  
To get the video I use the ytdl npm module.

  



  I then pipe this stream to the front-end.

  



  What I've found

  



  fluent-ffmpeg offers either pipe() or saveToFile().

  



  What I figured is that when I use the saveToFile() function and actually save my stream into an mp3 file, it works, I do get the album cover.

  



  But when I pipe the stream to front-end or even into a file, the song is saved properly into a file but without the album cover.

  



  Here is my code

  



  Back-end (NodeJS)

  



  let video = ytdl(`http://youtube.com/watch?v=${videoId}`, {
  filter: (format) => format.container === 'mp4' && format.audioEncoding,
  quality: 'lowest'
});

let stream = new FFmpeg()
  .input(video)
  .addInput(`https://i.ytimg.com/vi/${videoId}/default.jpg`)
  .outputOptions([
      '-map 0:1',
      '-map 1:0',
      '-c copy',
      '-c:a libmp3lame',
      '-id3v2_version 3',
      '-metadata:s:v title="Album cover"',
      '-metadata:s:v comment="Cover (front)"'
  ])
  .format('mp3');


  



  And then piping it to my front-end.

  



  stream.pipe(res);
stream
  .on('end', () => {
    console.log('******* Stream end *******');
    res.end.bind(res);
  })
  .on('error', (err) => {
    console.log('ERR', err);
    res.status(500).end.bind(res);
  });


  



  Front-end (React)

  



  axios.get(url)
  .then(res => {
    axios(`${url}/download`, {
      method: 'GET',
      responseType: 'blob'
    })
      .then(stream => {
        const file = new Blob(
          [stream.data],
          { type: 'audio/mpeg' });
        //Build a URL from the file
        const fileURL = URL.createObjectURL(file);
      })
      .catch(err => {
        console.log('ERROR', err);
      });
    })
    .catch(err => {
      console.log('ERROR', err);
    });


  


• how to attach a image in background using node-ffmpeg ?

  24 juillet 2018, par Nane

  I am really confused that how to attach image in the background and run the video in front Like that

  

  Code (this code returns only audio)

  ffmpeg()
  
      .input("front.mp4")
  
      .input('./bg.jpg')
  
      .complexFilter([
  
          'overlay=(W-w)/2:(H-h)/2:shortest=1,format=yuv420p',
  
      ])
  
      .output("output.mp4")
  
      .on("error",function(er){
  
          console.log("error occured: "+er.message);
  
      })
  
      .on('start', function() {
  
          console.log('file starting');
  
      })
  
      .on('progress', function(progress) {
  
          console.log('Processing: ' + progress.percent + '% done');
  
      })
  
      .on('codecData', function(data) {
  
          console.log('Input is ' + data.audio + ' audio ' +
  
              'with ' + data.video + ' video');
  
      })
  
      .on("end",function(){
  
          console.log("success");
  
      })
  
      .run();

• How to split 5.1 audio into discrete AAC streams in FFmpeg 4.0

  17 décembre 2018, par OwlBoy

  Up until FFmpeg v4.0 I have been able to run the following command on an input video file that contains an H.264 video track and either AC3 or DTS audio stream and produce an MP4 that has 6 streams of audio. Each stream corresponds to a channel of the 5.1 audio.

  ffmpeg -i INPUT.MKV -vcodec copy -filter_complex channelsplit=channel_layout=5.1 -acodec aac -movflags faststart OUTPUT.MP4

  It even worked on Stereo tracks and put the L and R channels into the proper places and produced some extraneous silent tracks for the other 4 channels.

  But now in v4.0.1 I get the following error :

  [aac @ 0x7f7f65001e00] Unsupported channel layout

  Error initializing output stream 0:0 — Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  Conversion failed !

  Changing the command to be the following does not improve things :

  ffmpeg -i INPUT.MKV -vcodec copy -filter_complex "channelsplit=channel_layout=5.1[FL][FR][FC][LFE][BL][BR]" -acodec aac -movflags faststart OUTPUT.MP4

  It gives the following error :

  Filter channelsplit:BR has an unconnected output

  (Note that BL/BR and SL/SR both produce the same error about BR)

  This MP4 file structure is useful for playing back inside of Unity with virtual speakers placed in the environment.

  My end goal :

  - MP4 (MOOV Atom at the Front)
  
      -H.264 Video Stream
  
      -AAC Audio Stream - FL
  
      -AAC Audio Stream - FR
  
      -AAC Audio Stream - FC
  
      -AAC Audio Stream - LFE
  
      -AAC Audio Stream - SL
  
      -AAC Audio Stream - SR