#30 Going to beginning resets speed()

[Andres Colubri]

When setting the playback speed of a movie using the speed() method, and the stream is returns to the beginning either using jump() or stop(), the speed is reset to zero.

Code that shows the error:

import codeanticode.gsvideo.*;

GSMovie movie;

public void setup() {
size(320, 240);
background(0);
movie = new GSMovie(this, "balloon.ogg");
movie.loop();

PFont font = loadFont("DejaVuSans-24.vlw");
textFont(font, 24);
}

public void movieEvent(GSMovie movie) {
movie.read();
}

public void draw() {
image(movie, 0, 0, width, height);

if (movie.isPlaying()) {
float newSpeed = map(mouseX, 0, width, 0.1, 2);
movie.speed(newSpeed);
fill(240, 20, 30);
text(nfc(newSpeed, 2) + "X", width - 80, 30);
}
}

public void keyPressed() {
if (key == 'p') {
//movie.pause();
movie.goToBeginning();
} else if (key == 'l') {
movie.loop();
//movie.goToBeginning();
}
}

[Anonymous]

Currently facing this issue, have you find a workaround? Thank you.
Lionel Radisson - Makio135

[Anonymous]

it seems to be due to this line in GSMovie.speed(): if (PApplet.abs(rate - irate) > 0.1) // avoid to set speed again if value is the same as actual speed
public void speed(float irate) {
// If the frameRate() method is called continuously with very similar
// rate values, playback might become sluggish. This condition attempts
// to take care of that.
if (PApplet.abs(rate - irate) > 0.1) {
rate = irate;
frameRate(fps); // The framerate is the same, but the rate (speed) could be different.
}
}

Here is a little workaround:

import codeanticode.gsvideo.*;

GSMovie movie;
float movieSpeed = 4.98;

public void setup() {
size(320, 240);
background(0);
movie = new GSMovie(this, "station.mov");
movie.loop();

textSize(24);
}

public void movieEvent(GSMovie movie) {
movie.read();
}

public void draw() {
if (movie.isPlaying()) {
movie.speed(movieSpeed);
image(movie, 0, 0, width, height);
fill(240, 20, 30);
text(nfc(movieSpeed, 2), width - 80, 30);

if(movie.duration()-movie.time()<.1){
movie.speed(movieSpeed+1);//modifying speed before goToBeginning,
movie.goToBeginning();
movie.speed(movieSpeed);// then setting speed back at next frame
}
}
}

void mouseMoved(){
movieSpeed = map(mouseX, 0, width, 0.1, 5);
println("new speed: "+movieSpeed);
}
</code>

A method like "float GSMovie.getSpeed(){ return rate; }" could be usefull.

Thanks for your great work.

Lionel Radisson / Makio135

[Andres Colubri]

Hello, thanks for your report.

Since GSVideo became the new built-in video library in Processing 2.0, I haven't had the time to work on it, and all the fixes and improvement have been done in the main trunk of Processing.

I think the changes in the core video library that take care of this issue are the following:

http://code.google.com/p/processing/source/detail?r=10264
http://code.google.com/p/processing/source/detail?r=9571

It would be great to backport them to GSVideo, and I'd also like to have a new release to make it more compatible with Processing 2.0 but right now the priority is to get 2.0 out...

Andres