The clip begins after the onset of “collapse.” Specifically, the NIST Report says the “[e]arliest frame from the Camera 9 video . . . was shot 9.4 s [plus or minus] 0.2 s after the east penthouse began to sink into the building.” See a chart listing “the 9 videos” used for detailed analysis (out of 16 available videos in the database). This chart places the camera at “[s]treet level, near the corner of Greenwich and Jay Streets.” TheMKMonarch attributes the video to Mike Hernandez of CBS.
See it at the TV archive first at 5:24 p.m. Also, see it in a compilation by Nathan Flach here or more recently, stabilized masterfully by the same Nathan/Xeno.
Raw NIST Cumulus file: CBS-Net Dub6 23 (Download at the NIST website at wtcdata.nist.gov [where you must first click Continue to agree to the terms, in order to be able to follow this link].)
CBS on Greenwich Street
YouTube 1, 2 & 3
