Brat, I'm sorry to report that the link you PMed me didn't work. Of course, it's walled and I had to use proxy sites to "climb over the wall" But I tried a couple of such sites, all giving me the same message: The site doesn't exist (or something to that effect).
---------- Post added at 07:03 AM ---------- Previous post was at 06:38 AM ----------
I like this one even better than goodboy's clearer ones, because this video is so real with so many reference points, which leads to my question: Could anyone here estimate the altitude of the J-20 during this test run? It looks to me to be so low, about 100 meters?