Question

我在处理过程中遇到简单的视频延迟会遇到很多麻烦。我在互联网上环顾四周，我一直在找相同的代码，我根本无法让它工作。当我第一次尝试它时，它什么都没做（根本没有）。这是我的修改版本（至少似乎将帧加载到缓冲区中），我真的不知道为什么它不起作用而且我真的厌倦了拔出我的头发。请...请为了上帝的爱，请有人指出我在这里犯的愚蠢错误。现在，没有进一步的延迟（哈哈，得到它？），代码：

import processing.video.*;

VideoBuffer vb;
Movie myMovie;
Capture cam;

float seconds = 1;

void setup() {
  size(320,240, P3D);
  frameRate(30);

  String[] cameras = Capture.list();

  if (cameras.length == 0) {
    println("There are no cameras available for capture.");
    exit();
  } else {
    println("Available cameras:");
    for (int i = 0; i < cameras.length; i++) {
      println(cameras[i]);
    }
  cam = new Capture(this, cameras[3]);
  cam.start(); 

  }

  vb = new VideoBuffer(90, width, height);

}

void draw() {

  if (cam.available() == true) {
    cam.read();
    vb.addFrame(cam);
  }

  image(cam, 0, 0);
  image( vb.getFrame(), 150, 0 );

}  



class VideoBuffer
{
  PImage[] buffer;

  int inputFrame = 0;
  int outputFrame = 0;
  int frameWidth = 0;
  int frameHeight = 0;

  VideoBuffer( int frames, int vWidth, int vHeight )
  {
    buffer = new PImage[frames];
    for(int i = 0; i < frames; i++)
    {
  this.buffer[i] = new PImage(vWidth, vHeight);
    }
    this.inputFrame = 0;
    this.outputFrame = 1;
    this.frameWidth = vWidth;
    this.frameHeight = vHeight;
  }

  // return the current "playback" frame.  
  PImage getFrame()
  {
    return this.buffer[this.outputFrame];
  } 

  // Add a new frame to the buffer.
  void addFrame( PImage frame )
  {
    // copy the new frame into the buffer.
    this.buffer[this.inputFrame] = frame;

    // advance the input and output indexes
    this.inputFrame++;
    this.outputFrame++;
    println(this.inputFrame + " " + this.outputFrame);

    // wrap the values..    
    if(this.inputFrame >= this.buffer.length)
    {
 this.inputFrame = 0;
    }
    if(this.outputFrame >= this.buffer.length)
    {
  this.outputFrame = 0;
    }
  }  
}

Answer 1

这适用于Processing 2.0.1。

import processing.video.*;

Capture cam;
PImage[] buffer;
int w = 640;
int h = 360;
int nFrames = 60;
int iWrite = 0, iRead = 1;

void setup(){
  size(w, h);
  cam = new Capture(this, w, h);
  cam.start();
  buffer = new PImage[nFrames];
}

void draw() {
  if(cam.available()) {
    cam.read();
    buffer[iWrite] = cam.get();
    if(buffer[iRead] != null){
      image(buffer[iRead], 0, 0);
    }
    iWrite++;
    iRead++;
    if(iRead >= nFrames-1){
      iRead = 0;
    }
    if(iWrite >= nFrames-1){
      iWrite = 0;
    }
  }       
}

addFrame - 方法中存在问题。您只需存储对PImage对象的引用，其对象的像素将一直被覆盖。您必须使用buffer[inputFrame] = frame.get()代替buffer[inputFrame] = frame。 get()方法返回图像的副本。

处理2.0中的视频延迟/缓冲

1 个答案: