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

[Bastien Nocera <hadess hadess net>]

On Wed, 2014-05-28 at 11:23 +0000, John Frankish wrote:
> > > > > > > > > -----Original Message-----
> > > > > > > > > From: Bastien Nocera [mailto:hadess hadess net]
> > > > > > > > > Sent: Monday, 26 May, 2014 14:15
> > > > > > > > > To: John Frankish
> > > > > > > > > Cc: cheese-list gnome org
> > > > > > > > > Subject: Re: cheese-3.10.2 does not detect webcam but
> > > > > > > > > guvcview does
> > > > > > > > >
> > > > > > > > > On Sat, 2014-05-24 at 15:07 +0000, John Frankish wrote:
> > > > > > > > > > #6  0x000000000040f0d3 in
> > > > > > > > > > cheese_effects_manager_add_effect (effect=<optimized out>, name=<optimized out>, 
> > > > > > > > > > self=0x1ed5610)
> > > > > > > > > >     at src/cheese-effects-manager.c:222
> > > > > > > > >
> > > > > > > > > Still missing important debug information I'm afraid.
> > > > > > > > 'seems the trick is to compile with "-ggdb"
> > > > > > > It's trying to build the Time delay effect which needs the
> > > > > > > "frei0r-filter- delay0r" plugin (which lives in the
> > > > > > > gst-plugins-bad package). Cheese should probably do better at avoiding crashing when an effect 
> > > > > > > isn't available.
> > > > > > >
> > > > > > > Could you please re-test with cheese 3.12.x, and file a bug if
> > > > > > > the problem persists?
> > > > > > Thanks
> > > > > >
> > > > > > Hmm - assuming we're referring to /usr/local/lib/gstreamer-
> > > > > 1.0/libgstfrei0r.so, it is present and correct...
> > > > >
> > > > > Are you sure that your GStreamer installation knows to go get the
> > > > > plugin there?
> > >
> > > Some progress being made at last
> > >
> > > I don't see it written anywhere, but the gstreamer frei0r plugin requires
> > frei0r-plugins in order to work.
> >
> > Are you filing bugs about this, or are we just debugging your hand-made
> > distribution?
>
> https://bugzilla.gnome.org/show_bug.cgi?id=730786
>
> > There's a test call cheese-test-monitor in the cheese sources which you can
> > use to debug your problem. The device monitor code uses udev to
> > enumerate devices. Attach the output of "udevadm info --export-db" so we
> > can see if the camera is detected properly.
>
> cheese-test-monitor doesn't do anything (cheese-test-camera seg faults).
>
> Udev output attached

Your udev installation is probably broken, as it doesn't tag the laptop
builtin camera with the necessary V4L tags. For example, on my system:
P: /devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2.7/3-2.7:1.0/video4linux/video1
N: video1
S: v4l/by-id/usb-56.18006.48133B10J_DELL_S2340T_Webcam_201209030001-video-index0
S: v4l/by-path/pci-0000:00:14.0-usb-0:2.7:1.0-video-index0
E: COLORD_DEVICE=1
E: COLORD_KIND=camera
E: DEVLINKS=/dev/v4l/by-id/usb-56.18006.48133B10J_DELL_S2340T_Webcam_201209030001-video-index0 
/dev/v4l/by-path/pci-0000:00:14.0-usb-0:2.7:1.0-video-index0
E: DEVNAME=/dev/video1
E: DEVPATH=/devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2.7/3-2.7:1.0/video4linux/video1
E: ID_BUS=usb
E: ID_FOR_SEAT=video4linux-pci-0000_00_14_0-usb-0_2_7_1_0
E: ID_MODEL=DELL_S2340T_Webcam
E: ID_MODEL_ENC=DELL\x20S2340T\x20Webcam
E: ID_MODEL_ID=570a
E: ID_PATH=pci-0000:00:14.0-usb-0:2.7:1.0
E: ID_PATH_TAG=pci-0000_00_14_0-usb-0_2_7_1_0
E: ID_REVISION=2903
E: ID_SERIAL=56.18006.48133B10J_DELL_S2340T_Webcam_201209030001
E: ID_SERIAL_SHORT=201209030001
E: ID_TYPE=video
E: ID_USB_DRIVER=uvcvideo
E: ID_USB_INTERFACES=:0e0100:0e0200:010100:010200:
E: ID_USB_INTERFACE_NUM=00
E: ID_V4L_CAPABILITIES=:capture:
E: ID_V4L_PRODUCT=DELL S2340T Webcam
E: ID_V4L_VERSION=2
E: ID_VENDOR=56.18006.48133B10J
E: ID_VENDOR_ENC=56.18006.48133B10J
E: ID_VENDOR_ID=0bda
E: MAJOR=81
E: MINOR=1
E: SUBSYSTEM=video4linux
E: TAGS=:seat:uaccess:
E: USEC_INITIALIZED=9244523794