Here is Jim Krumm, from Colorado, an InterNachi instructor who taught us the basics when we started, going through the basics of a sewer line inspection. This sewer line camera brand is the same we utilize, albeit a different model.
This 1930's home has had repairs and cleaning (blades) of the line. ABS, Cast Iron, Clay, SDR(Standard Dimenstional Ratio), and more clay! Note the offset SDR (green Pipe) at 35 feet. Minor roots and offsets in clay, common for the type. City Tap is also still clay at 61 feet.