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• I have a problem with my custom discord bot

  23 avril 2021, par madfrejen

  So, im making a discord bot for me and my friends in visual studio code, and recently i tried to make a music function where if i do the command .play it would join the channel i was in and play musik. I used ytdl-core and yt-search to play the music, but i got an error message :

  


  client.commands.get('play').execute(message, args);
                               ^

TypeError: Cannot read property 'execute' of undefined


  


  This is the code where the error seems to occur :

  


  else if(command == 'play'){
    client.commands.get('play').execute(message, args);


  


  and this is the command code

  


  module.exports = {
name: 'clear',
description: "Clears x amount of messages!",
async execute(message, args) {


    if(!args[0]) return message.reply("Skriv venligst hvor mange beskeder jeg skal slette :)");
    if(isNaN(args[0])) return message.reply("Skriv venligst et rigtigt tal!");

    if(args[0] > 100) return message.reply("Du kan ikke slette mere end 100 beskeder!");
    if(args[0] < 1) return message.reply("Du skal slette mindst 1 besked!");

    let role = message.member.roles.cache.some(r => r.name === "Admin");
    if(message.member.roles.cache.some(r => r.name === "Admin")){

        await message.channel.messages.fetch({limits: args[0]}).then(messages =>{
            message.channel.bulkDelete(messages);
        })
    
    }
}


  


  }

  


  

if you need any more code or information please text me, im new to coding :)


  


• Creating MPEG4 video file with Python from raw frames

  11 août 2016, par Mikko Ohtamaa

  I have a raw video frame source which I can access in Python. I’d like to create a MPEG4 video out of this, with MP3 background music.

  What kind of tools and libraries are available in Python for such a task ? Preferably I’d like to have an API for which I can feed output filename and then individual frames as 24 bit raw images.

• Sequencing MIDI From A Chiptune

  28 avril 2013, par Multimedia Mike — Outlandish Brainstorms

  The feature requests for my game music appreciation website project continue to pour in. Many of them take the form of “please add player support for system XYZ and the chiptune library to go with it.” Most of these requests are A) plausible, and B) in process. I have also received recommendations for UI improvements which I take under consideration. Then there are the numerous requests to port everything from Native Client to JavaScript so that it will work everywhere, even on mobile, a notion which might take a separate post to debunk entirely.

  But here’s an interesting request about which I would like to speculate : Automatically convert a chiptune into a MIDI file. I immediately wanted to dismiss it as impossible or highly implausible. But, as is my habit, I started pondering the concept a little more carefully and decided that there’s an outside chance of getting some part of the idea to work.

  Intro to MIDI
  MIDI stands for Musical Instrument Digital Interface. It’s a standard musical interchange format and allows music instruments and computers to exchange musical information. The file interchange format bears the extension .mid and contains a sequence of numbers that translate into commands separated by time deltas. E.g. : turn key on (this note, this velocity) ; wait x ticks ; turn key off ; wait y ticks ; etc. I’m vastly oversimplifying, as usual.

  MIDI fascinated me back in the days of dialup internet and discrete sound cards (see also my write-up on the Gravis Ultrasound). Typical song-length MIDI files often ranged from a few kilobytes to a few 10s of kilobytes. They were significantly smaller than the MOD et al. family of tracker music formats mostly by virtue of the fact that MIDI files aren’t burdened by transporting digital audio samples.
  
  I know I’m missing a lot of details. I haven’t dealt much with MIDI in the past… 15 years or so (ever since computer audio became a blur of MP3 and AAC audio). But I’m led to believe it’s still relevant. The individual who requested this feature expressed an interest in being able to import the sequenced data into any of the many music programs that can interpret .mid files.

  The Pitch
  To limit the scope, let’s focus on music that comes from the 8-bit Nintendo Entertainment System or the original Game Boy. The former features 2 square wave channels, a triangle wave, a noise channel, and a limited digital channel. The latter creates music via 2 square waves, a wave channel, and a noise channel. The roles that these various channels usually play typically break down as : square waves represent the primary melody, triangle wave is used to simulate a bass line, noise channel approximates a variety of percussive sounds, and the DPCM/wave channels are fairly free-form. They can have random game sound effects or, if they are to assist in the music, are often used for more authentic percussive sounds.

  The various channels are controlled via an assortment of memory-mapped hardware registers. These registers are fed values such as frequency, volume, and duty cycle. My idea is to modify the music playback engine to track when various events occur. Whenever a channel is turned on or off, that corresponds to a MIDI key on or off event. If a channel is already playing but a new frequency is written, that would likely count as a note change, so log a key off event followed by a new key on event.

  There is the major obstacle of what specific note is represented by a channel in a particular state. The MIDI standard defines 128 different notes spanning 11 octaves. Empirically, I wonder if I could create a table which maps the assorted frequencies to different MIDI notes ?

  I think this strategy would only work with the square and triangle waves. Noise and digital channels ? I’m not prepared to tackle that challenge.

  Prior Work ?
  I have to wonder if there is any existing work in this area. I’m certain that people have wanted to do this before ; I wonder if anyone has succeeded ?

  Just like reverse engineering a binary program entails trying to obtain a higher level abstraction of a program from a very low level representation, this challenge feels like reverse engineering a piece of music as it is being performed and automatically expressing it in a higher level form.