Unable to open video files with .mpeg file format using opencv in python

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Hi, I can open and display only .avi video files using OpenCV 2.4.6 in Python 2.7 When i try to open video files with .mpg or .mpeg video formats,the flag set for cap.isOpened() is returned as false.

I am unable to open or display the video files.

Will be helpful if anyone can throw some light on the same.

Thanks in Advance!