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• Grab frame from video (as Inputstream) using JavaCV in Java

  23 janvier 2020, par Praveen Gopal

  I am using JavaCV to grab frame from Video.

  I can grab if video is in absolute path. But if video is in HTTP than JavaCV throw error.

      url = new URL("http://www.sample-videos.com/video/mp4/720/SampleVideo.mp4");
  
      urlConnection = (HttpURLConnection) url.openConnection();
  
      InputStream inputStream = urlConnection.getInputStream();
  
      Java2DFrameConverter bimConverter = new Java2DFrameConverter();
  
  
  
      FFmpegFrameGrabber frameGrabber = new FFmpegFrameGrabber(inputStream);
  
  
  
      String output = "C:\\Users\\xxxx\\Downloads\\Test";
  
      frameGrabber.start();
  
       Frame frame;  
  
       double frameRate=frameGrabber.getFrameRate();  
  
       int imgNum=5;  
  
       System.out.println("Video has "+frameGrabber.getFrameRate()+" frames and has frame rate of "+frameRate);  
  
       try {   
  
         frameGrabber.setFrameNumber(1000);
  
         frame = frameGrabber.grabKeyFrame();  
  
         BufferedImage bi = bimConverter.convert(frame);  
  
         String path = output+File.separator+imgNum+".jpg";  
  
         ImageIO.write(bi,"png", new File(path));
  
         frameGrabber.stop();   
  
         frameGrabber.close();
  
         frameGrabber.flush();                                                                        
  
       } catch (Exception e) {  
  
         e.printStackTrace();  
  
       } 

  Any help would be helpful.
  Thanks in advance.

• Grab frame from video using JavaCV

  26 août 2020, par Praveen Gopal

  I am using JavaCV to grab frame from Video.

  


  I can grab if video is in absolute path. But if video is in HTTP than JavaCV throw error.

  


      url = new URL("http://www.sample-videos.com/video/mp4/720/SampleVideo.mp4");
    urlConnection = (HttpURLConnection) url.openConnection();
    InputStream inputStream = urlConnection.getInputStream();
    Java2DFrameConverter bimConverter = new Java2DFrameConverter();

    FFmpegFrameGrabber frameGrabber = new FFmpegFrameGrabber(inputStream);

    String output = "C:\\Users\\xxxx\\Downloads\\Test";
    frameGrabber.start();
     Frame frame;  
     double frameRate=frameGrabber.getFrameRate();  
     int imgNum=5;  
     System.out.println("Video has "+frameGrabber.getFrameRate()+" frames and has frame rate of "+frameRate);  
     try {   
       frameGrabber.setFrameNumber(1000);
       frame = frameGrabber.grabKeyFrame();  
       BufferedImage bi = bimConverter.convert(frame);  
       String path = output+File.separator+imgNum+".jpg";  
       ImageIO.write(bi,"png", new File(path));
       frameGrabber.stop();   
       frameGrabber.close();
       frameGrabber.flush();                                                                        
     } catch (Exception e) {  
       e.printStackTrace();  
     } 


  


• Issues with Discord JS Music Bot

  5 décembre 2020, par Thresio

  I am in the process of creating a Discord bot with JS, giving it management, auto role, etc. I just got to the music section of it and I can't quite figure out whats wrong.

  



  I believe I have installed FFmpeg correctly, as I have access to it from within the terminal. I have also used npm to bring ytdl-core and opusscript into my program.

  



  What this should do is make the bot join the chat, then play the Youtube link. Currently, I am not error checking the second argument as I just wanted to get it working initially. I have implemented several different instances of .toString() and String() however it always gives the same error listed below.

  



  . The program still throws this error :

  



  TypeError [ERR_INVALID_ARG_TYPE]: The "file" argument must be of type string. Received type object
TypeError [ERR_INVALID_ARG_TYPE]: The "file" argument must be of type string. Received type object

C:\Users\Thresio's PC\Desktop\Discord Bot\node_modules\opusscript\build\opusscript_native_wasm.js:8
var Module=typeof Module!=="undefined"?Module:{};var moduleOverrides={};var
key;for(key in Module){if(Module.hasOwnProperty(key))
{moduleOverrides[key]=Module[key]}}Module["arguments"]=
[];Module["thisProgram"]="./this.program";Module["quit"]=function(status,toThrow) {throw
toThrow};Module["preRun"]=[];Module["postRun"]=[];var ENVIRONMENT_IS_WEB=false;var 
ENVIRONMENT_IS_WORKER=false;var ENVIRONMENT_IS_NODE=false;var ENVIRONMENT_HAS_NODE=false;var 
ENVIRONMENT_IS_SHELL=false;ENVIRONMENT_IS_WEB=typeof window==="object";ENVIRONMENT_IS_WORKER=typeof 
importScripts==="function";ENVIRONMENT_HAS_NODE=typeof process==="object"&&typeof 
process.versions==="object"&&typeof 
process.versions.node==="string";ENVIRONMENT_IS_NODE=ENVIRONMENT_HAS_NODE&&!ENVIRONMENT_IS_WEB&&!ENVIRONM
ENT_IS_WORKER;ENVIRONMENT_IS_SHELL=!ENVIRONMENT_IS_WEB&&!ENVIRONMENT_IS_NODE&&!ENVIRONMENT_IS_WORKER;var
scriptDirectory="";function locateFile(path){i
abort(TypeError [ERR_INVALID_ARG_TYPE]: The "file" argument must be of type 
string. Received type object). Build with -s ASSERTIONS=1 for more info. 


  



  Here is my code for calling play :

  



  case 'play':

            function play(connection, message){
                var server = servers[message.guild.id];

                server.dispatcher = connection.playStream(ytdl(server.queue[0], {filter: 'audioonly'}));

                server.queue.shift();

                server.dispatcher.on('end', function(){
                    if(server.queue[0]){
                        play(connection, message);
                    }else {
                        connection.disconnect();
                    }
                })
            }

            if(!args[1]){
                message.channel.send('You need to provide a link!');
                return;
            }

            if(!message.member.voiceChannel){
                message.channel.send('You must be in a voice channel to play music!');
                return;
            }

            if(!servers[message.guild.id]) servers[message.guild.id] = {
                queue: []
            }

            var server = servers[message.guild.id];

            server.queue.push(args[1]);

            if(!message.guild.voiceConnection) message.member.voiceChannel.join().then(function(connection){
                play(connection, message);
            })
            break;


  



  If anyone could assist with this, I would be very grateful.

  



  EDIT : I unfortunately never figured out my main issue, but I have now found code that works (unlike mine :/).
For anyone else having this issue, I suggest using the code found here.
Works like a charm !