Hello Hồng Quân,

on my Lenovo ThinkPad X13 Yoga Gen 2 with

$lsusb
Bus 003 Device 003: ID 04f2:b6ea Chicony Electronics Co., Ltd Integrated Camera

I don't see any camera-image, I just see the magnifier on the left side and the moving magnifier ("scanning") on the right.

I use Debian 13 with Gnome 48 and Wayland, and the red video-sign is shown in the upper right corner, as well, as the camera's contol-light is on.

CoBang has been working as expected before (Version 0.9.10-1_all.deb), but no longer with CoBang-2.3.1 from your PPA.

Reading the other issues I ran:

G_MESSAGES_DEBUG=cobang cobang

Traceback (most recent call last):
  File "/usr/share/cobang/cobang/pages/scanner.py", line 515, in on_new_webcam_sample
    exist, width = struct.get_int('width')
                   ^^^^^^^^^^^^^^
AttributeError: 'StructureWrapper' object has no attribute 'get_int'

Doing some investigation I tried to figure out, which Version is the first failing and which is working, but after uninstalling 0.9.10 I don't get any version working again, even not 0.9.10.
So this is not related to the problem described above. I think it could have to do with updating my Debian system a year ago, and with old libs, but G_MESSAGES_DEBUG shows a different (and no longer relevant) problem anyway.

Thank you for your attention,
Christian