grimepoch

Clearly, I am doing something wrong. The documentation is not helping me understand how to use these things. I want to modify all the RGB of every pixel in a frame, then put those values back in. The line that has 'getcell' is locking up Max.

(this is only an example. Here I was trying to retain alpha but set everything else to 255)

autowatch=1;
inlets  = 1;
outlets = 1;

// Matrices that we will work with

var inputMatrix  = new JitterMatrix(4, "char", 1920, 1080);

// Jitter objects

var qtMovie = new JitterObject("jit.qt.movie", 1920, 1080);

// functions

function read(filename)
{    if(arguments.length==0)
    {    qtMovie.read();
    }
    else
    {    qtMovie.read(filename);
    }
}

// Process on frame
function bang()
{    // Load next frame
    qtMovie.matrixcalc(inputMatrix,inputMatrix);

    // OPERATE ON FRAME
    for( var x=0; x < 1920; x++)
    {    for( var y=0; y

Clearly, I am doing something wrong.  The documentation is not helping me understand how to use these things.  I want to modify all the RGB of every pixel in a frame, then put those values back in.  The line that has 'getcell' is locking up Max.

(this is only an example.  Here I was trying to retain alpha but set everything else to 255)

autowatch=1;
inlets  = 1;
outlets = 1;

// Matrices that we will work with

var inputMatrix  = new JitterMatrix(4, "char", 1920, 1080);

// Jitter objects

var qtMovie = new JitterObject("jit.qt.movie", 1920, 1080);

// functions

function read(filename)
{	if(arguments.length==0)
	{	qtMovie.read();
	}
	else
	{	qtMovie.read(filename);
	}
}

// Process on frame
function bang()
{	// Load next frame
	qtMovie.matrixcalc(inputMatrix,inputMatrix);

	// OPERATE ON FRAME
	for( var x=0; x < 1920; x++)
	{	for( var y=0; y

manipulating-movie-frames-in-javascript-code-is-hanging-max6

Or, is there some documentation on this anywhere? Even if it were C or Java based documentation on working with Jitter, I imagine the API concepts would help me understand what I am doing wrong.

Or, is there some documentation on this anywhere?  Even if it were C or Java based documentation on working with Jitter, I imagine the API concepts would help me understand what I am doing wrong.


You are missing an arg to setcell(). It should be:

inputMatrix.setcell(x,y,"val",argb[0],255,255,255);

However, the broader issue you are running into is the inefficiency of getcell/setcell. These simply wont work as fast as you probably want/need them to. I would highly recommend using jit.op, jit.expr, etc for this kind of functionality.

Check out the Javascript Jitter Tutorials, those might get you started. You can also download the Max 6 SDK for an idea of some of the backbone that this stuff is written on top of.

You are missing an arg to setcell().  It should be:

However, the broader issue you are running into is the inefficiency of getcell/setcell.  These simply wont work as fast as you probably want/need them to.  I would highly recommend using jit.op, jit.expr, etc for this kind of functionality.

Check out the Javascript Jitter Tutorials, those might get you started.  You can also download the Max 6 SDK for an idea of some of the backbone that this stuff is written on top of.

Manipulating movie frames in Javascript, code is hanging MAX6