3 Jun 2015 filename, Name of the output video file. fourcc, 4-character code of codec used to compress the frames. For example, VideoWriter::fourcc('P','I'19 Aug 2014 C++: VideoWriter::VideoWriter(const String& filename, int fourcc, double filename – Name of the output video file. fourcc – 4-character code of VideoWriter (const String &filename, int fourcc, double fps, Size frameSize, bool isColor=true) fourcc, 4-character code of codec used to compress the frames. cap = cv2.VideoCapture(0). while(True):. # Capture frame-by-frame Sometimes, it is a headache to work with Video Capture mostly due to wrong installation of ffmpeg/gstreamer. FourCC is a 4-byte code used to specify the video codec.