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x264 isn't a standard?

No, it's a program that encodes video.

H.264 / AVC / MPEG-4 Part 10 is the standard that describes the video format encoded by x264.

Nope, H.264 in Matroska is not a standard.

The TV scene people now use H.264 in MP4.

That's only for SD releases; HD still use the MKV container