imencode issue

[paolobolettieri]

I'm triyng to encode a Mat as JPEG into a byte array, but it doesn't work, the byte array doesn't change its own values.

Below an example code:

String imagePath = "path of my jpeg image";
Mat img = imread(imagePath);
byte[] byteArray = new byte[1];
imencode(".jpg", img, byteArray);

byteArray value remains [0].
Is this a JavaCV issue, or is there anything wrong in my code?

[saudet]

Try with BytePointer instead of byte[].

[paolobolettieri]

It works! Thank you.

[saudet]

Good! It should also work if you provide a large enough byte[].

[paolobolettieri]

I also tried with a big array of one million elements
byte[] byteArray = new byte[1000000];
but it doesn't work.

[saudet]

That's probably fixed if you try the latest code: bytedeco/javacpp-presets#109

[robertoandrade]

Building a BytePointer out of an existing byte[] doesn't seem to work either. Is there a javacpp-presets release that includes fixes for this and using a ByteBuffer also?

[saudet]

No release yet, no.