SSAI Test Pattern 10min

10 minute SMPTE bars test pattern with burnt-in timecode (HH:MM:SS:FF at 25fps) for MediaTailor SSAI ad timing validation. Three mid-roll ad break markers at 2:00, 5:00 and 8:00. No preroll marker - prerolls handled by GAM outside the MPD. Used for validating VAST/VMAP ad insertion with AD_BUFFET mode.