Useful findings
Video may reveal roots, offsets, broken areas, heavy buildup or a recurring obstruction once the line is open enough for the camera to travel.
Important limits
A camera does not see through dirty water, cannot always determine the condition outside a pipe and may not establish exact depth or location without compatible locating equipment.
Match findings to the symptom
One slow fixture points differently than several lower-level fixtures backing up together. Rodding, camera work and excavation decisions should follow the actual drainage pattern.