When trying to execute display_frame_depth.py sample on a Raspberry PI 4 with an Raspbian 10 (buster) OS 32-bit, and PYTHON 2.7.16 (also tried PYTHON 3.7.8) I get
/dev/video0 UVC_SET_CUR failed (protocol error)
just after "Process Terabee 3Dcam(2df2:0214) init..."