System information (version)

• OpenCV => 4.6.0
• Operating System / Platform => Android (64 Bit)

Detailed description

I saw some topics about https://forum.opencv.org but there was not answer on it.

I opened a video file and I tried to get the props: CAP_PROP_FPS, CAP_PROP_FRAME_WIDTH, CAP_PROP_FRAME_HEIGHT and CAP_PROP_FRAME_COUNT. All of them returns 0.

NOTE: The video is opened and I can read the frames one by one.

I checked the source code and for android NDK backend at least the frame width and height looks like they are implemented.

Steps to reproduce

This is a code for the test application

        if (cap.isOpened) {
            details += "isOpen: true\n"
            details += "Backend name: ${cap.backendName ?: ""}\n"
            details += "FPS: ${cap.get(CAP_PROP_FPS)}\n"
            details += "Frame width: ${cap.get(CAP_PROP_FRAME_WIDTH)}\n"
            details += "Frame height: ${cap.get(CAP_PROP_FRAME_HEIGHT)}\n"
            details += "Frame count: ${cap.get(CAP_PROP_FRAME_COUNT)}\n"

            val frame = Mat()
            var frameCounter = 0
            while (cap.read(frame)) frameCounter++
            details += "Read frame counted: ${frameCounter}\n"
        } else {
            details += "isOpen: false"
        }

The test complete source code is here: https://github.com/danopdev/OpenCVVideoCaptureTest

This is the screenshot of the result:

The test video is here: https://github.com/danopdev/OpenCVVideoCaptureTest/blob/master/sample/20220621_082109.mp4
(a little more than 10MB so I can't attach it)

Issue submission checklist

• [ x ] I report the issue, it's not a question
• [ x ] I checked the problem with documentation, FAQ, open issues,
  forum.opencv.org, Stack Overflow, etc and have not found any solution
• [ x ] I updated to the latest OpenCV version and the issue is still there
• [ x ] There is reproducer code and related data files: videos, images, onnx, etc