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In OpenCV I am using the following function to create a CvCapture from a file:

CvCapture * data = cvCreateFileCapture(filename);

this works fine for video files with .avi extension. When I use a an internet camera using rtsp protocol I get the following error:

warning: Error opening file (../../modules/highgui/src/cap_ffmpeg_impl.hpp:477)

Obviously there is something wrong with the codecs. Anybody knows how to solve it? Would rather need step by step instructions since I am a newbie with OpenCV.

Radek
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    Related questions: [link](http://stackoverflow.com/questions/7269135/how-to-use-opencv-to-extract-frames-from-mpeg-files) and [link](http://stackoverflow.com/questions/6670515/problem-with-videocapture-in-opencv-2-3) – Ian Medeiros Nov 23 '11 at 17:53

2 Answers2

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filename must seem like : "C:\\test.avi"，check your filePath

user1756343
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First make sure you have the correct path to the video file.

Then, if error persists, install some codecs. K-lite pack, by example. Restart your computer.

Sam
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