H.264 is video codec, it's covered by MPEG-4 Part 10 "Advanced Video Coding" and H.264 is ITU alias for the same spec.
MPEG-4 Part 14 is "MP4 file format" which is the format of the file you hooked up onto VLC. It's video part is H.264, and it's audio part is AAC as you can see on the screenshot.
AAC is the audio codec. It's covered by MPEG-4 Part 3 spec.