Henrik Gramner authored Feb 15, 2017 and Anton Mitrofanov committed Jun 14, 2017

These levels were added in the 2016-10 revision of the H.264 specification and
improves support for content with high resolutions and/or high frame rates.

Level 6.2 supports 8K resolution at 120 fps.

Also shrink the x264_levels array by using smaller data types.