IPCapture code example crashes

Jabberwock

I am trying to use the example code from IPCapture, but it crashes right after start. I think I had it running once, but now I am not so sure. I do have the permissions set as required in the code. The app crashes Nexus 5 with latest LineageOS. The emulator also crashes. The code works fine in Java mode.

kfrajer

What Android Mode version and Processing version are you using? Also what Android API?

It will b helpful if you can copy and paste the error message below.

Kf

Jabberwock

Processing 3.3.4, Android Mode - last official release (0254?), Android API 25. On Android there is no error message other than „app stopped working” (or something like that, I have the Polish version), in the console there is only: at processing.core.PApplet.run(Unknown Source) at java.lang.Thread.run(Thread.java:761)

In the emulator the app also stops, but there is nothing in the console.

Jabberwock

I did some debugging and it seems the problem is related to the Internet connection or the Internet permission.

If I run the app on the device without the permission, it runs fine. If I run it again just after turning the permission on, it runs fine. I can even restart the phone and the app responds properly.

The problem starts when I compile it again. Then it crashes and cannot be run at all. Maybe the permission is not reapplied correctly at second and further compilations?

jeremydouglass

Strange -- are you able to strip a copy of your code down to a minimal example that exhibits this second-compile crash bug? If so perhaps you should file a bug report.

Jabberwock

Only now I have managed to experiment with this. This code:

import ipcapture.*;

IPCapture cam;

void setup() {
  cam = new IPCapture(this, "http://195.235.198.107:3346/axis-cgi/mjpg/video.cgi?resolution=320x240", "", "");
  cam.start();

}

void draw() {
  if (cam.isAvailable()) {
    cam.read();
  }
}

crashes the app. Commenting out cam.read(); makes it run again. Turning off Internet permissions makes it run again, but then cam.read(); is not executed as cam is not available. This command works only the first time the permissions are set.

jeremydouglass

Thanks! Please edit that post and format your code:

https://forum.processing.org/two/discussion/15473/readme-how-to-format-code-and-text

If you have looked at the docs and there is no explanation for this behavior, it looks like a minimal example that could be a very helpful bug report:

https://github.com/singintime/ipcapture/issues

Jabberwock

Done.

jeremydouglass

Thanks so much for reporting https://github.com/singintime/ipcapture/issues/4 -- I hope the library maintainer has a suggested solution....