[GEM-dev] uvc webcam (eee pc 900 built in) with pix_video?

[Ivica Ico Bukvic]

The way I fixed this on MSI Wind which uses UVC driver as well is to compile
latest version of the v4l2 object that includes some changes I forwarded to
the maintainer (I think it is part of the pdp or pidip, can't remember any
more). That worked perfectly fine even though I had similar problems with
Gem. IIRC when I was inquiring about this the last time I think the reply
was that currently v4l2 is not supported well under Gem (although please
take this with a boulder of salt as this has been a while ago).

Hope this helps!

Best wishes,

Ico

> -----Original Message-----
> From: gem-dev-bounces at iem.at [mailto:gem-dev-bounces at iem.at] On Behalf Of
> ben at ekran.org
> Sent: Sunday, May 10, 2009 7:34 PM
> To: gem-dev at iem.at
> Subject: [GEM-dev] uvc webcam (eee pc 900 built in) with pix_video?
> 
> hey all,
> 
> I'm doing a workshop in HK in about 13 days.
> 
> I wanted to demo pix_video, but I can't seem to get things working on my
> eee pc.
> 
> The device is working with v4l2, I can get a feed from mplayer with:
> 
> mplayer tv:// -tv driver=v4l2:device=/dev/video0:fps=30
> 
> seems generic enough. Here is the output regarding video format:
> 
> Opening video decoder: [raw] RAW Uncompressed Video
> VDec: vo config request - 640 x 480 (preferred colorspace: Packed YUY2)
> VDec: using Packed YUY2 as output csp (no 0)
> Movie-Aspect is undefined - no prescaling applied.
> VO: [xv] 640x480 => 640x480 Packed YUY2
> Selected video codec: [rawyuy2] vfm: raw (RAW YUY2)
> 
> I'm working with an svn copy of GEM updated yesterday. I'm configuring
> with:
> 
> ./configure --prefix=/usr --without-libv4l1 --with-libv4l2-libs=/usr/lib/
> --with-libv4l2-includes=/usr/include/
> 
> and GEM complains about the camera when I start pix_video (and I get no
> video image):
> 
> v4l: VDIOCGCHAN: Invalid argument
> 
> This device/camera must only have one channel?
> 
> I can't tell if I'm using v4l1 or 2. configure tells me v4l: yes not
> matter if its v4l1 or v4l2 I enable. I also have a vague memory that
> configure should tell me what v4l its using, like:
> 
> v4l: yes (libv4l2)
> 
> but I can't get that output with any combination of flags. Did I imagine
> it?
> 
> Anyhow let me know if anyone has a working uvc webcam in gem
> (linux-intrepid) or better yet working eeepc webcam.
> 
> Thanks all.
> 
> Here is a link to what I'm doing here in HK:
> 
> http://www.videotage.org.hk/projects/20090514_dreamingmachine.htm
> 
> I'll have to make another post about some issues with pix_crop, and
> pix_buffer save, which forced me to change some aspects of the project!
> 
> ..b..
> 
> 
> 
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