Have you tried playing from the sd card directly?
Such as power down the camera, remove the sd card and insert in phone or reader on computer.
If playback is smooth in direct mode, then possible network or router wifi issue.
If still choppy, maybe sd card compatible issue.
DLink cameras (imo) do not like sandisk (or kingston even though they are factory suggested), and usually need class 6 to 10 or better.
Maybe try a different sd card brand like transcend or lexar or sony.
If that doesn't work, then maybe try adjusting the settings in the local web url (not the mydlink website interface), or updating/reflashing the firmware.
((These settings worked for my 2630 to reduce the 'stop motion animation' They may or may not work for your camera.))
Settings for local url; make all video profiles 720p/1080p 20/15fps at 1.5mbps, h.264 if available, jpeg to 'better' (not 'excellent'), set sd card to record from the profile 1 in h.264, shorten video record segments to 55 seconds with 5 seconds pre-record.[/size]