VINS-Mobile with front-facing camera

[passionbull]

Hello,
I am trying to run VINS-mobile with front-facing camera on iOS and Android. Once I chagne camera number, App works with front-facing camera. But, it doesn't initialize and dosen't work SLAM.

It is my video I tested. https://www.youtube.com/watch?v=x__SkZjFHZ4

I think it doesn't work because of camera calibration parameter and camera-imu parameter. I read the issues on this repo and I have some questions.

1. For getting parameters, how can I convert ios/android data to rosbag?
2. I am using front-facing camera. what is different with rear and front? Should I check something? I think the equation should be changed.. but, I don't know what exactly I should change.
3. Is there good way to get camera calibration parameter and camera-imu parameter?