Can't create a grey I slice

[BlueWaterCrystal]

Hi,

I can't seem to correctly write a grey I slice, I'm using CAVLC Baseline 1280x720.

Current I slice:

It seems to only go up to 342 macroblocks even though 3600 were created.

Goal I slice:

H264 File:
I_SLICE_ONLY_CAVLC_BASELINE.zip