According to ISPY in the list @IAmATeaf mentioned, there is one that seems to match your cam. This is a guess:
Check toward the bottom for "Other" that has rtsp:/ [CHANNEL]. Try changing the Main stream in BI from / to /0 or /1 to see if the full resolution main stream could be represented as a 0 or 1, respectively. If /0 works, then try /1 and see if it gives you a lower res video, otherwise if /1 works, try /2 and see if you get a lower res video.