Ranchonyx

5y

And now I've run into a whole another issue which is really fucking strange.

Has it ever occured that a Object in java looses all it's values after being put into an array of same type?

My problem:

[code...]

Mat[] matArray = new Mat[totalFramesOfVideo];

videoCapture.open();

Mat currentFrame = new Mat();
int frameCounter = 0;
while(videoCapture.read()) {

currentFrame = (last read frame as a Mat)

matArray[frameCounter] = currentFrame;

frameCounter++;
}

then, after filling the array and accessing elements, they lose all their object values.
Eg. Before currentFrame's dimensions were 10801920, but matArray[index] dimensions are suddenly 00.

rant

Ranter

Comments

1

Fast-Nop

39106

5y

https://tutorialspoint.com/Array-Co...

Especially item 1.
3

yellow-dog

43826

5y

Probably because you are modifying an external variable and only putting its reference into the array?
1

hitko

3145

5y

Since it looks like you're using OpenCV I'm guessing the problem is that you're doing

Mat currentFrame = new Mat();
while(videoCapture.read()) {
videoCapture.retrieve(currentFrame);
matArray[frameCounter] = currentFrame;
}

This basically puts each new frame into the same Mat object, and then sets all items in the array to point to that object - try something like

@highlight
Mat currentFrame = new Mat();
int frameCounter = 0;
while(videoCapture.read(currentFrame))) {
matArray[frameCounter] = currentFrame;
currentFrame = new Mat();
frameCounter++;
}
1

highlight

969

5y

@hitko
1

Ranchonyx

10516

5y

Thanks for all replies, it's a really dumb mistake on my side.
I'll see if it works tomorrow.
0

Ranchonyx

10516

5y

@hitko Been a long time, I tried it, it worked, thanks a lot.

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