'Take a snapshot of the current video window.
If i_width AND i_height is 0, original size is used.
If i_width XOR i_height is 0, original aspect-ratio is preserved.
@param num: number of video output (typically 0 for the first/only one).
@param psz_filepath: the path where to save the screenshot to.
@param i_width: the snapshot\'s width.
@param i_height: the snapshot\'s height.
@return: 0 on success, -1 if the video was not found.'

def video_take_snapshot(self, num, psz_filepath, i_width, i_height):

    return libvlc_video_take_snapshot(self, num, str_to_bytes(psz_filepath), i_width, i_height)
