That video re-raises the question whether the video was captured by a quad or some other camera platform. The article refers to a 'tracking camera' and I find it unlikely that a quad would have followed the duration of re-entry that accurately.
Why wouldn't it be a hexacopter as used for Grasshopper/F9R videos?
Compare the CRS-6 footage to the chase-plane footage taken during the Cassiope re-entry. This is a monster telephoto lens, not one you would find even on a heavily modified quad. Would you develop a new system using a quad or simply hire the same company that has the aircraft, cameras, and crew that captured Cassiope successfully? Tracking a Grasshopper hop is a completely different critter than a re-entry.
Wasn't that Orbcomm OG2 Flight 1? I don't think any CASSIOPE footage was released, unfortunately.
Yes, Orbcomm, and you are correct, only the single image of CASSIOPE. I was told that the same company photographed the CASSIOPE water-landing as the CRS-6 tracking footage, and this matches the Orbcomm landing as well. Looks like there may have been two airborne cameras for CRS-6, the quad and the tracking cam.
From CASSIOPE all we got was an image and I think I saw (may be in some talk) atmospheric reentry footage from CASSIOPE as well.
I also see some parallax as mentioned by Ugordan. I tried aligning both side by side by horizon and you can see stage position is different with respect to line of horizon for same sequence of events.
Edit: Diamond DA42 MPP was used as chase plane for Orbcomm. For CRS 6 it appears one camera was tracking and other lower one was locked on drone ship.