There is some indication that he left for Camp David on August 4, 2012, late in the afternoon or early evening. Skim through this google search:
https://www.google.com/search?q=obam+camp+david+Aug.+4%2C+2012
And he was wearing different clothes, but that isn’t important, I suppose.
I wonder if the range at Camp David is really so close to the road in the background.