Pixel counts indicate that conquest mode in Battlefield 1 on PS4 uses a dynamic resolution. The lowest and highest pixel counts found during regular gameplay were approximately 1100x620 and 1807x1014 respectively. There also appears to be a rare bug that causes the resolution to drop to an extremely low pixel count for a short period of time as can be seen here http://imgur.com/a/jHoB2. The lowest pixel count found during this drop is about 160x90.
Besides not being able to hold the 60fps target, the game also drops below 720p in normal circumstances. First game to ever do that on PS4.
Is this the beginning of the end for the vanilla PS4?