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Problem with OpenCV camera calibration from video file

Hi all,

I am trying to get calibration parameters for my camera using the sample code included with OpenCV. When I try to run the calibration using a video file as an input I get the following error:

OpenCV Error: Parsing error (GOPR0047.avi(0): Too long string or a last string w/o newline) in unknown function, file ......\src\opencv\modules\core\src\persistence.cpp, line 1844

Anyone know what might be causing this error? Is there a size limit on the input video perhaps?

Thanks for any help