'Gets a numpy array representing the RGB picture of the clip at time t
or (mono or stereo) value for a sound clip'

@convert_to_seconds(['t'])
def get_frame(self, t):

    if self.memoize:
        if (t == self.memoized_t):
            return self.memoized_frame
        else:
            frame = self.make_frame(t)
            self.memoized_t = t
            self.memoized_frame = frame
            return frame
    else:
        return self.make_frame(t)
