I am using Android Studio and Kotlin to develop an android application, part of this involves extracting video frames, and filtering the relevant ones. I am using OpenCV to extract the frames. So, I am running the code for OpenCV using python. When I try to pass the path of the video file from MainActivity.kt to the python file for extracting frames, I come across the error:
com.chaquo.python.PyException: TypeError: Argument 'index' is required to be an integer

My MainActivity.kt:

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val py = Python.getInstance()
        val module = py.getModule("opencvtest")
        val cvRes = module["FrameCapture"]
        val path = Uri.parse("android.resource://" + packageName + "/" + R.raw.video2)
        val a = cvRes?.call(path)
        println("The value of a is $a")


    }
}

My python file:

import cv2

def FrameCapture(path):
    vidObj = cv2.VideoCapture(path)
    fps = int(vidObj.get(cv2.CAP_PROP_FPS))
    frame_count = int(vidObj.get(cv2.CAP_PROP_FRAME_COUNT))
    count = 1
    frames_arr = []

    for i in range(int(frame_count/fps)+1):
        arr_frame = []
        arr_lap = []

        for j in range(fps):
            success, frame = vidObj.read()

            if success:
                laplacian = cv2.Laplacian(frame, cv2.CV_64F).var()
                arr_lap.append(laplacian)
                arr_frame.append(frame)

        selected_frame = arr_frame[arr_lap.index(max(arr_lap))]
        frames_arr.append(selected_frame)

        count = count + 1

    cv2.imwrite("frame1.jpg", frames_arr[0])
    cv2.imwrite("frame2.jpg", frames_arr[count-2])
    return True

I have noticed that the error comes on the line, vidObj = cv2.VideoCapture(path).
This means it is expecting the argument for VideoCapture to be an integer called “index”.
Then I searched online to find

So there are different implementations of VideoCapture, and my code expects the argument index.

The path to my video file is : android.resource://com.example.videotrail1/2131951616 (in case the problem is due to the way it is specified)

I used chaquopy to support python on Android Studio, and Python version : 3.8

Any help regarding the error, or any alternate and efficient methods to use OpenCV in Android Studio are appreciated.