Hi Keita,
The HDMI 1.4a support 4K x 2K video formats.
The HDMI 1.4 specification adds support for extremely high video resolutions that go far beyond today’s 1080p systems.
4K is shorthand for 4,000 lines wide by 2,000 lines high, or roughly four times the resolution of a 1080p display.
The term actually covers two formats, both supported in the HDMI 1.4 specification:
3840 pixels wide by 2160 pixels high
4096 pixels wide by 2160 pixels high
So if you are use HDMI 1.4a, the 1200(H) x 1920(V) can be supported.
Hope this can help you.
Have a nice day.
Best Regards
Dan