Am Sonntag, den 27.03.2011, 07:18 -0400 schrieb Benson Bear:
> I have a UVC web cam, the Creative Live! Cam Chat HD, and am trying
> to run it under Fedora 14's 2.6.35.11-83.fc14.i686.PAE kernel,
> using X.Org X Server 1.9.4, and the current intel driver for the on-chip
> integrated graphics of a core I3 processor.
>
> This camera works nicely in everything like cheese, camstream, camorama,
> xawtv and guvcview. It doesn't work in the one thing I want it for: Skype.
>
> I am pretty sure this is Skype's fault, exacerbated by its closed nature
> and the fact it has not had an upgrade for a long while. But I
> wonder if anyone has an idea whether this could be fixed or whether
> I should just return the camera for restocking fee and keep trying
> other ones. (I note that the V0700 doesn't appear to be officially
> supported, but since it works in everything else, Skype seems to be
> to blame).
>
> Here is the ID from lsusb:
> Bus 001 Device 009: ID 041e:4088 Creative Technology, Ltd
>
> What usb and uvcvideo report in /var/log/messages:
> [52201.794788] usb 1-1.5: Product: VF0700 Live! Cam Chat HD
> [52201.794793] usb 1-1.5: Manufacturer: Creative Technology Ltd.
> [52201.794797] usb 1-1.5: SerialNumber: 0L220009
> [52201.799938] uvcvideo: Found UVC 1.00 device VF0700 Live! Cam Chat
> HD (041e:4088)
>
> I can include in subsequent messages more of v4l-info and lsusb details,
> but for now the most potentially useful observations seem to me to be the
> following:
>
> v4l-info seems to be saying that the camera has multiple possible
> video capture modes:
>
> video capture
> VIDIOC_ENUM_FMT(0,VIDEO_CAPTURE)
> index : 0
> type : VIDEO_CAPTURE
> flags : 0
> description : "YUV 4:2:2 (YUYV)"
> pixelformat : 0x56595559 [YUYV]
> VIDIOC_ENUM_FMT(1,VIDEO_CAPTURE)
> index : 1
> type : VIDEO_CAPTURE
> flags : 1
> description : "MJPEG"
> pixelformat : 0x47504a4d [MJPG]
> VIDIOC_G_FMT(VIDEO_CAPTURE)
> type : VIDEO_CAPTURE
> fmt.pix.width : 320
> fmt.pix.height : 240
> fmt.pix.pixelformat : 0x56595559 [YUYV]
> fmt.pix.field : NONE
> fmt.pix.bytesperline : 640
> fmt.pix.sizeimage : 153600
> fmt.pix.colorspace : SRGB
> fmt.pix.priv : 0
>
> Guvcview, it seems (I keep saying "it seems" because I don't
> really understand this) to allow us to see what the cameras streaming
> output looks like when interpreted in different ways.
>
> By default it chooses MJPG, but if I choose YUYV, it
> produces a distorted output that looks *very similar* to
> the distorted output produced by Skype.
>
> This leads me to believe that perhaps the only problem is
> that Skype is not interpreting the output of the camera
> correctly, and all that perhaps need be done is to force
> the camera to put out the kind of output Skype thinks it
> is getting.
>
> This does not seem to require any conversion anywhere
> since the camera appears to be capable of putting out
> the YUYV that I speculate Skype thinks it is getting.
>
> Does any expert think this is a possibility, and if so
> would it be hard to force the camera to just put out
> a selected one of its native modes?
>
> I assume the UVC interface already allows one to force a
> certain mode output but that Skype messes this up and
> the solution would have to be to set the default mode
> differently. Perhaps not as there is not option for
> any of this on the two v4l control panels I am aware
> of.
>
> (Other things tried to far, to no avail: setting
> Skype to various capture sizes and frame rates,
> thinking perhaps it was confused about thos, and
> also trying the fake video stream thing that is
> floating around from a view years ago. Haven't
> gotten too far with that as of yet.)
>
please attach output of "lsusb -vd 041e:4088 > lsusb"
and please attach a dump of first frame "luvcview -f yuv -s 320x240 -c"
(you will get file frame000.raw)
Regards,
Alexey
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