[Bug 670197] New: webcam not work due to non-fatal error

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=670197
  GStreamer | gst-plugins-good | 0.10.30

           Summary: webcam not work due to non-fatal error
    Classification: Platform
           Product: GStreamer
           Version: 0.10.30
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: glin at suse.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


OS: openSUSE 12.1
Webcam: built-in Suyin Corp webcam for HP notebook (usbid 064e:e28a)

When I used gstreamer-properties to test the webcam, I got those error
messages:

gstreamer-properties-Message: Error running pipeline 'Video for Linux 2
(v4l2)': Failed getting controls attributes on device '/dev/video0'. [v4l2_call
s.c(267): gst_v4l2_fill_lists (): /GstPipeline:pipeline0/GstV4l2Src:v4l2src1:
Failed querying control 9963790 on device '/dev/video0'. (5 - Input/output
error)]

Some error messages also showed in dmesg:

[ 2409.912169] uvcvideo: Failed to query (GET_DEF) UVC control 12 on unit 2:
-32 (exp. 4).
[ 2409.916282] uvcvideo: Failed to query (GET_DEF) UVC control 12 on unit 2:
-32 (exp. 4).
[ 2412.842290] uvcvideo: Failed to query (GET_DEF) UVC control 12 on unit 2:
-32 (exp. 4).

After a further test, It failed in the queries for
V4L2_CID_RED_BALANCE(9963790) and V4L2_CID_BLUE_BALANCE(9963791).

Since mplayer works fine with the webcam, I tried to ignore the error messages,
and it worked. Maybe gst-plugins-good can just show warnings instead of errors
to be compatible with more webcams.

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