Camera freeze with Vuforia AR under Android with 64 bit

I'm in the process of developing a small AR app. Everything worked fine with Mono as scripting backend. But then i had to learn that the Google Playstore requires 64bit App bundles. In order to enable the "ARM64" option i had to switch the scripting backend to "IL2CPP".

With this setting, the App still works, but whenever a marker is detected, the camera feed freezes for about 0.2 to 0.5 seconds.

Does anyone know a solution for this?

Unity 2018.4.0f1 (i can't use a 2019.x version, because the auto-focus for the camera under Android doesn't work.)

Vuforia version 8.1.11

 

Additions:

- The effect is also visible in the Vuforia samples, but not as strong. I believe this is because the sample uses fewer markers. I have around 60 in my project.

- it happens with both image markers and VuMarkers

- The effect is much stronger in 64bit mode (ARM64) than in 32bit mode (ARMV7)

 

Hello,

What device are you using when this is observed? Settings->About phone/device->Model number. Or is it across multiple devices?

This will help us to better replicate. Also, if you can share your device database, that would be very helpful. Feel free to DM me a link if you don't want to post here.

Thanks,
Vuforia Engine Support

 

I tested this on:
Xiaomi Mi A2 (Android 9)
Bluboo S1 (Android 7)

It happens on both devices, the effect is much stronger on the BluBoo (much weaker CPU).

Would it still help to get the device database? If yes, where do i find it?

 

Addition #2:

Today i made a quick test with Unity 2019.1.8f1 and the new Vuforia 8.3.8.

In a minimal sample, started from an empty scene (not from one of the Vuforia samples), i could not reproduce the problem. Currently i don't have time to longer experiments, but as soon as i get to it, i'll report back.

 

Hello @mj321,

Unfortunately, we don't have either of those devices. Keep us informed if you run into the issue again and we'll take it from there.

Thanks,
Vuforia Engine Support

 

Have some problem on:
Oppo realme 3 (RMX1821)(Android 9.0 Pie)
Oppo F11 Pro (OP4883) (Android 9.0 Pie)
Mi8 lite (Android 9.0)

 

Hello @skdev3,

Are you reporting a new issue? Or is this the same issue you reported here?: https://forum.unity.com/threads/vuforia-engine-8-x-bugs-camera-initializes-very-long-time.711716/

Thanks,
Vuforia Engine Support

 

Need Used other version NDK ( "android-ndk-r16b")

 

Thanks, but changing the NDK did not have any effect for me.