[gst-devel] v4l2src0: Could not negotiate format

[John Buckley]

Stefan, 
Thanks for the help. I was able to get things working by loading gst-plugin-jpeg. I did an opkg update and searched the /var/lib/opkg/gstreamer package listing for jpeg and found the package. 
I guess I still don't quite understand how linux software modules and packages are put together. That will come with time, I hope. 

Now, I need to speed up the camera throughput, figure out how to get rid of all the o/s overhead, and get my application to run as efficiently as possible. 

John 


----- Original Message ----- 
From: "Stefan Kost" <ensonic at hora-obscura.de> 
To: "Discussion of the development of GStreamer" <gstreamer-devel at lists.sourceforge.net> 
Sent: Tuesday, November 3, 2009 12:34:05 PM GMT -05:00 US/Canada Eastern 
Subject: Re: [gst-devel] v4l2src0: Could not negotiate format 

John Buckley schrieb: 
> Hello, 
> I've been trying to get an approved USB webcam (Creative Optia AF) to run 
> using GStreamer and sending the output to an XWindow and I keep getting 
> failures. 
> 
> I have the uvcvideo module loaded and /dev/video0 is present. 
> 
> I am running openembedded on the Gumstix Verdex Pro XL6P. Could it be that 
> the camera is USB 2.0 and the Verdex Pro is only rated for USB 1.1? 
> 
> This is what I see when I plug the camera in... 
> 
> root at gumstix-custom-verdex:~# usb 1-2: new full speed USB device using 
> pxa27x-ohci and address 4 
> usb 1-2: configuration #1 chosen from 1 choice 
> uvcvideo: Found UVC 1.00 device VF0560 Live! Cam Optia AF (041e:406d) 
> input: VF0560 Live! Cam Optia AF as 
> /devices/platform/pxa27x-ohci/usb1/1-2/1-2:1.0/input/input3 
> 4:3:1: cannot get freq at ep 0x84 
> 
> When I try to gst-launch with the v4lsrc or v4l2src elements and I get the 
> error below. I have tried a variety of settings using the 'video/x-raw-rgb' 
> cap but I always get the same error. The videotestsrc element works fine 
> with ximagesink. 
> 
> root at gumstix-custom-verdex:~# gst-launch v4l2src ! ximagesink 
> Setting pipeline to PAUSED ... 
> ERROR: Pipeline doesn't want to pause. 
> ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Could not 
> negotiate format 
> Additional debug info: 
> gstbasesrc.c(2584): gst_base_src_start (): 
> /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: 
> Check your filtered caps, if any 
> Setting pipeline to NULL ... 
> Freeing pipeline ... 
> root at gumstix-custom-verdex:~# 
> 
> Any help would be greatly appreciated... 
> Thanks, 
> John Buckley 
> 
> 
can you run v4l-info and post the output. Or look at the log of 
GST_DEBUG=v4l2src:4. Or just try gst-launch v4l2src ! decodebin2 ! 
xvimagesink 

Stefan 

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