CODEWITHSUNDEEP
c#emgucvmat
Alireza Izadimehr
Alireza Izadimehr

Reputation: 334

Emgu.CV QueryFrame Function Error: 'OpenCV: _step >= minstep' On changing Resolution

I'm Working on Image Processing With Emgu.CV (4.9.0.5494). all things were ok until I tried to change the capture resolution:

_capture.Start();
_captureInProgress = true;
await Task.Delay(500);
_capture.Set(CapProp.FrameWidth, 1280);
_capture.Set(CapProp.FrameHeight, 720);
_capture.Set(CapProp.Fps, 30);
_capture.ImageGrabbed += ProcessFrame;

after change resolution i Got this: 'OpenCV: _step >= minstep' On _capture.QueryFrame() when I remove these lines, everything will be OK: (default resolution is 640*480)

_capture.Set(CapProp.FrameWidth, 1280);
_capture.Set(CapProp.FrameHeight, 720);
_capture.Set(CapProp.Fps, 30);

I attached a picture of debugging too. what should I do? thanks.

OpenCV: _step >= minstep

Upvotes: 0

Views: 89

Answers (1)

Alireza Izadimehr
Alireza Izadimehr

Reputation: 334

I found the Solution! I'm trying to set VideoCapture parameters instead of using Set Functions in Constructor. like this: and everything works fine!

   Tuple<CapProp, int>[] prop = new Tuple<CapProp, int>[3];
   prop[0] = new Tuple<CapProp, int>(CapProp.FrameWidth, 2560);
   prop[1] = new Tuple<CapProp, int>(CapProp.FrameHeight, 1440);
   prop[2] = new Tuple<CapProp, int>(CapProp.Fps, 30);
   _capture = new VideoCapture(1, VideoCapture.API.Any, prop);

Upvotes: 1

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