Pass additional options to cv::cuda::VideoReader

[cudawarped]

Detailed description

There is no way to set the FFmpeg backend timeout (CAP_PROP_OPEN_TIMEOUT_MSEC ) in cv::cuda::VideoReader.
This would be useful when streaming from an RTSP source because if the source is unavalibale the timeout before control returns to the calling thread is substantial.

To include this functionality I am not sure if it would be better to add another aditional option to createVideoReader

CV_EXPORTS_W Ptr<VideoReader> createVideoReader(const String& filename, const bool rawMode = false, const int openTimeOutMs = 30000);

or pass in const std::vector<int>& params as used by VideoCapture::open

CV_EXPORTS_W Ptr<VideoReader> createVideoReader(const String& filename, const bool rawMode = false, const std::vector<int>& params = );
allowing other params to be easily added in the future?

Additionaly if a vector of params are used, the rawMode, flag could be removed? I know this would break the existing API , however it would be cleaner and the rawMode flag has only recently been introduced?

Issue submission checklist

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

[alalek]

rawMode

It can be removed safely (no release yet (planned on this week) and there are no very strong requirements in opencv_contrib).

[cudawarped]

rawMode

It can be removed safely (no release yet (planned on this week) and there are no very strong requirements in opencv_contrib).

Thanks @alalek

Now I'm looking at it, it may be better to leave that option in and add the params so they can pass straight through. rawMode is a pure VideoReader option and it would seem unecessary to add extra enums to VideoReader to validate and remove this from std::vector<int>& params before passing to the FFmpeg backend unless you can see some merit in it?

[alalek]

I have no preferences here.