Am Sonntag, den 27.03.2011, 18:24 -0400 schrieb Benson Bear:
> On Sun, Mar 27, 2011 at 9:07 AM, Alexey Fisher
> <bug-tr...@fisher-privat.net> wrote:
>
> > please attach output of "lsusb -vd 041e:4088 > lsusb"
> > and please attach a dump of first frame "luvcview -f yuv -s 320x240 -c"
>
> Thank you for your reply. Please see attached.
>
> I have never used luvcview. It is interesting that
> no matter how I specify the -f option here, it gives
> the same result, and that result is subjectively
> very similar to what skype is showing. The
> horizontal split in the screen hops up and down.
> I cannot get luvcview to show a normal
> undistorted view at all, counter to all the other
> programs I mentioned in my last message: is
> it perhaps subject to the same problem that
> skype is?
>
> (Actually, the raw image attachment is too
> large for the list. In the rare event
> anyone other than Alexey wants to take
> a look at it, let me know. I can describe
> it a little: the correct image is cut horizontally
> about 2/3 of the way down and glued
> together with the top part on the bottom,
> and it has horizontal bands of
> distortion throughout.)
According to the raw sample you send, you get only ~3/4 of first frame,
last part of the image is the beginning of second frame.
The reason can be... lost packets by usb controller... or may be camera
send only this parts... or hmm...
Can you please attach dmesg with trace, to enable trace you need:
sudo rmmod uvcvideo && sudo modprobe uvcvideo trace=0xffff
Can you please also try different frame rates with yuv.
Your gstreamer workaround probably grubs jpg stream from the cam.
One other interesting thing is, dwMaxVideoFrameBufferSize for yuv is
correctly reported by the cam: 153600 (320*240*16/8); but reported frame
buffer size for jpeg is mach bigger: 230400 (it should be actually
less).
The answer to your previous question: IMHO, if you can return this cam,
do it. UVC should just work.
Regards,
Alexey.
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