nx_ts_nal_gate.nx

nx_ts_nal_gate.nx -- proof for the HEVC indexing hole (2026-07-31). The load-bearing tests are T7/T8: an HEVC keyframe byte, read through the H.264 mask, classifies as NOT a keyframe. That is exactly what the pre-fix nx_ts_index did to every H.265 recording -- and it is why the failure was silent. It never errored; it just found no keyframes, forever. T11/T12 are the RANGE boundaries. IRAP is 16..23, not a single value, so an off-by-one at either end silently drops real seek points on a CRA-heavy stream while still looking like it works. license_tier: ORIGINAL