Having problem trying to write mp4 video

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I am having problem trying to write to a video. This line of code

out = cv2.VideoWriter("vid.mp4"), cv2.VideoWriter_fourcc('H','2','6','4'), 10, (960,540))

gives me the error message below. I don't understand what the error means and what I can do.

OpenCV: FFMPEG: tag 0x34363248/'H264' is not supported with codec id 27 and format 'mp4 / MP4 (MPEG-4 Part 14)' OpenCV: FFMPEG: fallback to use tag 0x31637661/'avc1' Could not find encoder for codec id 27: Encoder not found