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• Audio playing back at the wrong speed using FFmpeg on Android

  11 avril 2019, par Kyborg2011

  General problem in the following :
  I decode the audio as follows :

  ReSampleContext* rsc = av_audio_resample_init(
  
          1, aCodecCtx->channels,
  
          aCodecCtx->sample_rate, aCodecCtx->sample_rate,
  
          av_get_sample_fmt("u8"), aCodecCtx->sample_fmt,
  
          16, 10, 0, 1);
  
  
  
  while (av_read_frame(pFormatCtx, &packet)>= 0) {
  
      if (aCodecCtx->codec_type == AVMEDIA_TYPE_AUDIO) {
  
          int data_size = AVCODEC_MAX_AUDIO_FRAME_SIZE * 2;
  
          int size=packet.size;
  
          int decoded = 0;
  
  
  
           while(size > 0) {
  
               int len = avcodec_decode_audio3(aCodecCtx, pAudioBuffer, 
  
                   &data_size, &packet);
  
  
  
               //Сonvert audio to sample 8bit
  
               out_size = audio_resample(rsc, outBuffer, pAudioBuffer, len);
  
  
  
               jbyte *bytes = (*env)->GetByteArrayElements(env, array, NULL);
  
  
  
               memcpy(bytes, outBuffer, out_size);
  
               (*env)->ReleaseByteArrayElements(env, array, bytes, 0);
  
               (*env)->CallStaticVoidMethod(env, cls, mid, array, out_size, number);
  
  
  
               size -= len;
  
               number++;
  
           }
  
       }
  
   }

  Next release it AudioTrack. After that, I hear that song that was necessary, but with noise and speed of 2 times larger. In what may be the problem ?

  UPDATE :
  This is Java code :

  public static AudioTrack track;
  
  public static byte[] bytes;
  
  protected void onCreate(Bundle savedInstanceState) {
  
      super.onCreate(savedInstanceState);
  
      setContentView(R.layout.main);
  
      int bufSize = 2048;
  
      track = new AudioTrack(AudioManager.STREAM_MUSIC, 44100, AudioFormat.CHANNEL_OUT_MONO, 
  
                  AudioFormat.ENCODING_PCM_8BIT, bufSize, AudioTrack.MODE_STREAM); 
  
  
  
      bytes = new byte[bufSize];
  
      Thread mAudioThread = new Thread(new Runnable() {
  
          public void run() {
  
              int res = main(2, "/sdcard/muzika_iz_reklami_bmw_5_series_-_bmw_5_series.mp3", bytes);
  
              System.out.println(res);
  
          } 
  
      });
  
      mAudioThread.setPriority(Thread.MAX_PRIORITY);
  
      mAudioThread.start(); 
  
  }
  
  
  
  private static void play(byte[] play, int length, int p) {
  
      if (p==0){
  
          track.play();
  
      }
  
      track.write(play, 0, length); 
  
  }

• Reading and changing the pixel value of mp4 frames in java

  24 mars 2019, par David

  I am attempting to create a steganographic program to hide data in videos. I intend to do this by changing the least significant bits of pixels in all or at least several frames.

  The thing I’m getting stuck on is how to actually insert the data into the video. The data in every frame will be an encryption of the actual data I want to hide alongside the timestamp of the frame. The reason i include the timestamp is so that every one of them is different which makes it more difficult to detect. I have previously used FFMPEG to extract images from videos and then working with the images, so a solution using FFMPEG would be ideal but I am open to using whatever works.

  So Is there any way to do this in Java ?
  Time efficiency isn’t super important but it would obviously take forever to create a new copy of the video for every frame that is changed.

• how to locate the voice chat that the discord bot is connected to

  10 mars 2019, par SwaggZ ReYan

  I am making a discord bot that is being activated by voice recognition, im at the very beginning right now im making him join a voice channel (which is working), and im trying to make a command to make him leave.

  const commando = require('discord.js-commando');
  
  
  
  class LeaveChannelCommand extends commando.Command
  
  {
  
      constructor(client){!
  
          super(client,{
  
              name: 'leave',
  
              group: 'music',
  
              memberName: 'leave',
  
              description: 'leaves a voice channel'
  
          });
  
      }
  
      async run(message, args)
  
      {
  
          if(message.guild.voiceConnection)
  
          {
  
              message.guild.voiceConnection.disconnect();
  
          }
  
          else
  
          {
  
              message.channel.sendMessage("seccessfully left")
  
          }
  
      }
  
  }
  
  
  
  module.exports = LeaveChannelCommand;

  right now you can type !leave from anywhere in the server and the bot leaves,
  i want to make it possible to control him only from the same voice channel,
  what should i do