[gst-devel] v4l2 src not working

[Stefan Kost]

Am 05.03.2010 01:55, schrieb Christopher Harvey:
> hi list,
> Just getting started with gstreamer (but I've used v4l2 directly alot). I read 
> the documentation for the v4l2src plugin and so I tried to run the example 
> gst-launch command:
> 
> gst-launch-0.10 v4l2src ! xvimagesink
> and
> gst-launch-0.10 v4l2src ! jpegdec ! xvimagesink
> 
> but in both cases I get this error:
> --------------------------------
> (gst-launch-0.10:6900): GLib-WARNING **: g_set_prgname() called multiple times
> Setting pipeline to PAUSED ...
> Pipeline is live and does not need PREROLL ...
> ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Device 
> '/dev/video0' cannot capture at 1280x960
> Additional debug info:
> gstv4l2object.c(1854): gst_v4l2_object_set_format (): 
> /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
> Call to S_FMT failed for YUYV @ 1280x960: Input/output error
> ERROR: pipeline doesn't want to preroll.
> Setting pipeline to PAUSED ...
> Setting pipeline to READY ...
> Setting pipeline to NULL ...
> Freeing pipeline ...
> ------------------------------------
> I've tried manually telling it what resolution to use, but they all fail. I 
> know this camera works, because it run with guvciew with no problems. 

The output of v4l-info would be interesting. In case of a driver issue you can
try your luck with:

LD_PRELOAD=/usr/lib/libv4l/v4l2convert.so gst-launch-0.10 v4l2src ! xvimagesink

Stefan

> 
> This is what lspci says about the camera:
> Bus 001 Device 002: ID 046d:08ca Logitech, Inc. Mic (Fusion)
> 
> uname -a
> Linux Tool 2.6.31-gentoo-r6 #7 SMP PREEMPT Sat Feb 20 13:32:41 EST 2010 x86_64 
> AMD Athlon(tm) 64 X2 Dual Core Processor 4200+ AuthenticAMD GNU/Linux
> 
> [I--] [  ] media-libs/gstreamer-0.10.24 (0.10)
> [I--] [  ] media-plugins/gst-plugins-v4l2-0.10.16 (0.10)
> 
> $ zcat /proc/config.gz | grep V4L
> CONFIG_VIDEO_V4L2_COMMON=y
> # CONFIG_VIDEO_ALLOW_V4L1 is not set
> # CONFIG_VIDEO_V4L1_COMPAT is not set
> CONFIG_VIDEO_V4L2=y
> CONFIG_V4L_USB_DRIVERS=y
> 
> I also tried on another computer (OpenSUSE, not gentoo)
> with gstreamer 0.10.21 
> and v4l2src 0.10.10-3.22.1 (whatever version that is)
> and that same camera (plus a few others) work just fine. 
> 
> I'm not sure why this is happening, I installed gstreamer out of package 
> management so I assumed it was setup properly (ie, all kernel settings are 
> there) and if it worked in version 10.21 then 10.24 should also work. I'm 
> trying not to assume anything anymore. If anybody knows what's going on or if 
> more information is needed I can post it or try any ideas. 
> 
> Also, please CC everybody on this message, as this concerns a few people. 
> 
> thanks,
> Christopher.
> 
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