RE: cheese-3.10.2 does not detect webcam but guvcview does

[John Frankish <j-frankish slb com>]

> > > -----Original Message-----
> > > From: John Frankish
> > > Sent: Thursday, 22 May, 2014 17:33
> > > To: 'cheese-list gnome org'
> > > Subject: cheese-3.10.2 does not detect webcam but guvcview does
> > >
> > > Using cheese-3.10.2 compiled from scratch, the integrated webcam on
> > > my dell e6220 is not detected, but using guvcview it works fine.
> > >
> > > Various output pasted below, what trouble-shooting steps could I try?
> > >
> > > Regards
> > > John
> > I did some more checking and found:
> >
> > $ cheese --device=/dev/video1
> > ...
> > (cheese:9922): GStreamer-CRITICAL **: gst_bin_add: assertion
> > 'GST_IS_ELEMENT (element)' failed
>
> There's a required element that's missing (which probably means that
> cheese expects it to be there, but your installation is broken, or Cheese isn't
> checking for it correctly).
>
> Try running:
> G_DEBUG=fatal_warnings gdb --args cheese --device=/dev/video1
>
> Type "run" at the gdb prompt, and type "bt" when the first happens. If the
> first warning isn't the one generating the warning above, type "continue".
>
> This sort of warning is probably better reported in Bugzilla though, and using
> the latest version of Cheese (3.12.1) would be a good idea.
Thanks for the suggestion - here's what I got:

$ G_DEBUG=fatal_warnings gdb --args cheese --device=/dev/video0
GNU gdb (GDB) 7.5.1
...
(gdb) run
Starting program: /usr/local/bin/cheese --device=/dev/video1

(cheese:25641): GStreamer-CRITICAL **: gst_bin_add: assertion 'GST_IS_ELEMENT (element)' failed

Program received signal SIGTRAP, Trace/breakpoint trap.
0x00007fffecf924ca in g_logv () from /usr/local/lib/libglib-2.0.so.0
(gdb) bt
#0  0x00007fffecf924ca in g_logv () from /usr/local/lib/libglib-2.0.so.0
#1  0x00007fffecf9259d in g_log () from /usr/local/lib/libglib-2.0.so.0
#2  0x00007ffff65c7770 in gst_bin_add () from /usr/local/lib/libgstreamer-1.0.so.0
#3  0x00007ffff65deb22 in ?? () from /usr/local/lib/libgstreamer-1.0.so.0
#4  0x00007ffff659c12a in gst_parse_launch_full () from /usr/local/lib/libgstreamer-1.0.so.0
#5  0x00007ffff65dd43f in gst_parse_bin_from_description_full () from /usr/local/lib/libgstreamer-1.0.so.0
#6  0x000000000040f0d3 in ?? ()
#7  0x00007fffecf82812 in g_hash_table_foreach () from /usr/local/lib/libglib-2.0.so.0
#8  0x00000000004122ed in cheese_effects_manager_load_effects ()
#9  0x000000000040cee0 in cheese_main_window_setup_ui ()
#10 0x00000000004174b0 in ?? ()
#11 0x00007fffed42d4c7 in g_signal_emit_valist () from /usr/local/lib/libgobject-2.0.so.0
#12 0x00007fffed43f2ee in g_signal_emit () from /usr/local/lib/libgobject-2.0.so.0
#13 0x00000000004133c9 in ?? ()
#14 0x00007fffee2d4d19 in g_application_run () from /usr/local/lib/libgio-2.0.so.0
#15 0x0000000000416b34 in _vala_main ()
#16 0x00007fffec780468 in __libc_start_main () from /lib/libc.so.6
#17 0x000000000040bc15 in _start ()
(gdb) continue
Continuing.

(cheese:18094): GLib-GObject-CRITICAL **: g_object_ref_sink: assertion 'G_IS_OBJECT (object)' failed

Program received signal SIGTRAP, Trace/breakpoint trap.
0x00007fffecf924ca in g_logv () from /usr/local/lib/libglib-2.0.so.0
(gdb) bt
#0  0x00007fffecf924ca in g_logv () from /usr/local/lib/libglib-2.0.so.0
#1  0x00007fffecf9259d in g_log () from /usr/local/lib/libglib-2.0.so.0
#2  0x00007fffed4271fd in g_object_ref_sink () from /usr/local/lib/libgobject-2.0.so.0
#3  0x000000000040f0de in ?? ()
#4  0x00007fffecf82812 in g_hash_table_foreach () from /usr/local/lib/libglib-2.0.so.0
#5  0x00000000004122ed in cheese_effects_manager_load_effects ()
#6  0x000000000040cee0 in cheese_main_window_setup_ui ()
#7  0x00000000004174b0 in ?? ()
#8  0x00007fffed42d4c7 in g_signal_emit_valist () from /usr/local/lib/libgobject-2.0.so.0
#9  0x00007fffed43f2ee in g_signal_emit () from /usr/local/lib/libgobject-2.0.so.0
#10 0x00000000004133c9 in ?? ()
#11 0x00007fffee2d4d19 in g_application_run () from /usr/local/lib/libgio-2.0.so.0
#12 0x0000000000416b34 in _vala_main ()
#13 0x00007fffec780468 in __libc_start_main () from /lib/libc.so.6
#14 0x000000000040bc15 in _start ()

(gdb) continue
Continuing.
** Message: cheese-application.vala:291: Error during camera setup: No device found

(cheese:25641): cheese-CRITICAL **: cheese_camera_device_get_device_node: assertion 'CHEESE_IS_CAMERA_DEVICE 
(device)' failed

Program received signal SIGTRAP, Trace/breakpoint trap.
0x00007fffecf924ca in g_logv () from /usr/local/lib/libglib-2.0.so.0
(gdb) bt
#0  0x00007fffecf924ca in g_logv () from /usr/local/lib/libglib-2.0.so.0
#1  0x00007fffecf9259d in g_log () from /usr/local/lib/libglib-2.0.so.0
#2  0x00007ffff7bd8f98 in cheese_camera_device_get_device_node () from /usr/local/lib/libcheese.so.7
#3  0x0000000000411f77 in cheese_preferences_dialog_construct ()
#4  0x000000000041750a in ?? ()
#5  0x00007fffed42d4c7 in g_signal_emit_valist () from /usr/local/lib/libgobject-2.0.so.0
#6  0x00007fffed43f2ee in g_signal_emit () from /usr/local/lib/libgobject-2.0.so.0
#7  0x00000000004133c9 in ?? ()
#8  0x00007fffee2d4d19 in g_application_run () from /usr/local/lib/libgio-2.0.so.0
#9  0x0000000000416b34 in _vala_main ()
#10 0x00007fffec780468 in __libc_start_main () from /lib/libc.so.6
#11 0x000000000040bc15 in _start ()
(gdb) 
(gdb) continue
Continuing.

(cheese:25641): GLib-CRITICAL **: g_variant_new_string: assertion 'string != NULL' failed

Program received signal SIGTRAP, Trace/breakpoint trap.
0x00007fffecf924ca in g_logv () from /usr/local/lib/libglib-2.0.so.0
(gdb) bt
#0  0x00007fffecf924ca in g_logv () from /usr/local/lib/libglib-2.0.so.0
#1  0x00007fffecf9259d in g_log () from /usr/local/lib/libglib-2.0.so.0
#2  0x00007fffecf8b739 in g_variant_new_string () from /usr/local/lib/libglib-2.0.so.0
#3  0x00007fffee32f53e in g_settings_set_string () from /usr/local/lib/libgio-2.0.so.0
#4  0x0000000000411f87 in cheese_preferences_dialog_construct ()
#5  0x000000000041750a in ?? ()
#6  0x00007fffed42d4c7 in g_signal_emit_valist () from /usr/local/lib/libgobject-2.0.so.0
#7  0x00007fffed43f2ee in g_signal_emit () from /usr/local/lib/libgobject-2.0.so.0
#8  0x00000000004133c9 in ?? ()
#9  0x00007fffee2d4d19 in g_application_run () from /usr/local/lib/libgio-2.0.so.0
#10 0x0000000000416b34 in _vala_main ()
#11 0x00007fffec780468 in __libc_start_main () from /lib/libc.so.6
#12 0x000000000040bc15 in _start ()
(gdb) 
(gdb) continue
Continuing.

(cheese:25641): GLib-GIO-CRITICAL **: g_settings_set_value: key 'camera' in 'org.gnome.Cheese' expects type 
's', but a GVariant of type '(null)' was given

Program received signal SIGTRAP, Trace/breakpoint trap.
0x00007fffecf924ca in g_logv () from /usr/local/lib/libglib-2.0.so.0
(gdb) bt
#0  0x00007fffecf924ca in g_logv () from /usr/local/lib/libglib-2.0.so.0
#1  0x00007fffecf9259d in g_log () from /usr/local/lib/libglib-2.0.so.0
#2  0x00007fffee32f38b in g_settings_set_value () from /usr/local/lib/libgio-2.0.so.0
#3  0x0000000000411f87 in cheese_preferences_dialog_construct ()
#4  0x000000000041750a in ?? ()
#5  0x00007fffed42d4c7 in g_signal_emit_valist () from /usr/local/lib/libgobject-2.0.so.0
#6  0x00007fffed43f2ee in g_signal_emit () from /usr/local/lib/libgobject-2.0.so.0
#7  0x00000000004133c9 in ?? ()
#8  0x00007fffee2d4d19 in g_application_run () from /usr/local/lib/libgio-2.0.so.0
#9  0x0000000000416b34 in _vala_main ()
#10 0x00007fffec780468 in __libc_start_main () from /lib/libc.so.6
#11 0x000000000040bc15 in _start ()
(gdb)