One thing to remember is putting a camera down a line is not always as useful as it sounds. Once the camera gets to where the blockage is the screen will go black. It is important that the line is clear and taking water before trying to view the bigger picture.
Things like cracks, breaks, or offsets may have occurred. We have all heard of home settling, while this does not exclude your outdoor plumbing. Most concrete pipes are installed in sections, if a section has settled and had gotten lower than another section of concrete pipe, your sewer line now has created a dam, causing solid materials to get caught on this offset.
Be aware that roots may have broken through your sewer main. This is a common problem especially if you have trees in your yard.
If you ever experience any of these problems or something similar be sure to call YARO Plumbing. We will clean your building drain, and camera inspect the inside of the pipe for any of the damages listed above.