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• FFMPEG How to join the audio of one song into the instrumental of another song

  28 mai 2020, par Patrice Andala

  The Problem :

  



  So I am creating an android app where people can upload music and I want people to be able to take the vocals of one song and the instrumental from another song and merge them to create a different song, and I think the android FFMPEG library is the best way to accomplish this.

  



  What I've been able to do :

  



  1.) I have been able to get the instrumental from a song using this command : -i audio1.mp3 -af pan='stereo|c0=c0|c1=-1*c1' -ac 1 output.mp3But the job isn't so good, since I can still hear some audio in the background and not all the audio is removed.

  



  2)I've been able to join two audio files using the command -y -i audio1.mp3 -i audio2.mp3 -filter_complex '[0:0][1:0] amix=inputs=2:duration=longest' -c:a libmp3lame output.mp3

  



  What I need

  



  1) I need to be able to strip just the vocals of a song. Is there an FFMPEG command to do this ?

  



  2)I need a better command to get me the instrumental of the song, since the one I'm using is not goood enough.

  



  3) I need a command that will help me determine the starting point of a song in an instrumental, so that I know where to place the new vocals when I finally merge them.

  



  4) How to get the bpm of an audio file with ffmpeg, since I know songs mix well when their bmp is almost similar

  



  Any help in any of these areas is greatly appreciated.

  


• Batch Copy Cover Art from One Song to Another (Identical File Names)

  19 juillet 2020, par LeLwrence

  I'm looking for a way to copy the album art from one set of songs to another set of the same songs that don't have the album art. FFMPEG copies the text tags (artist, album, title...) perfectly, but will not copy the embedded album artwork.

  



  I've been trying to batch convert my folder of MP3s into 128k AAC (using FFMPEG and the libfdk-aac codec) files to save space on my phone, but it hasn't copied my album art over to the new songs.
I used the following batch command :

  



  FOR /F "tokens=*" %%G IN ('dir /b *.mp3') DO ffmpeg -i "%%G" -c:a libfdk_aac -b:a 128k "%%~nG.m4a"


  



  EDIT : I tried using the following command to test it out, because stream 0:0 is the audio, and stream 0:1 is the JPEG, however it did not work :

  



  ffmpeg -i Estranged.mp3 -map 0:0 -map 0:1 -c:a libfdk_aac -b:a 128k -c:v copy Estranged.m4a


  



  Here's a paste of the log : http://pastebin.com/dZFsvR7F (I know, it's not the latest version. I had trouble compiling it myself but I'm currently working on it.)

  



  Is there a way to copy the album art (or entire tag, if need be) from songs with an identical name in one folder to the songs in the new folder ?

  



  I.E. C:\Folder1\song.mp3 → C:\Folder2\song.m4a

  



  Thanks.

  


• issue with ffmpeg (not loading song ?) - ffmpeg stream : write EPIPE

  15 novembre 2020, par super

  issue : with some songs that i play through the StreamDispatcher from the discord.js module (seems to be ones that have silences at the beginning), the dispatcher will almost immediately finish and throw an error. i use the ffmpeg-static module.

  


  from what i've seen, these are the two errors that i'm receiving from calling the "debug" and "error" events of the dispatcher

  


  Error: ffmpeg stream: write EPIPE

  


  Error [ERR_STREAM_DESTROYED]: ffmpeg stream: Cannot call write after a stream was destroyed

  


  reproducible code sample (requires ytdl-core) :

  


  /**
* @param {Discord.VoiceConnection} connection 
* @param {String} url 
*/
async function run(connection, url) // assuming these two variables aren't null
{
    const video = ytdl(url, { highWaterMark: 5242880 });
    video.on("error", (err) => console.log(err));
    let dispatcher = connection.play(video);
    dispatcher.on("finish", () => console.log("finished"));
    break;
}
// recommended url: https://www.youtube.com/watch?v=Auk1oVI2Icw
// (this is one i've been using to test this issue)


  


  original code from my project plus some comments from guiding :

  


  async play() // this is my function for playing music on the bot
{
    if (this.queue.length === 0) return;
    if (!this.guild.me.voice || !this.guild.me.voice.channel) return;
    let connection = this.guild.me.voice.connection;
    if (!connection) return;
    if (connection.dispatcher) return;
    let track = this.queue[0];
    let channel = this.guild.channels.cache.get(track.channelID);
    switch (track.type)
    {
        //case "soundcloud" omitted
        case "youtube":
        {
            const video = ytdl(track.url, { highWaterMark: 5242880 });
            video.on("error", (err) => console.log(err));
            channel.send(`playing: **${track.name}** // requester: **${track.requester.tag}**`);
            let dispatcher = connection.play(video); // dispatcher will begin
            dispatcher.setVolume(this.volume);
            dispatcher.on("finish", () => this.finish()); // almost immediately the following will be called
            // fyi: there isn't anything special in the function called, just some code to shift the queue
            break;
        }
    }
}


  


  details :

  


  

  • discord.js version : 12.4.1

  


  • node.js version : v12.18.3

  


  • operating system : windows 10