A couple things to try...

What is the output of :

v4l2-ctl -d 6 --list-formats

or even

v4l2-ctl --all

Additionally, try doing:

GST_DEBUG=2 LD_PRELOAD=/usr/lib/libv4l/v4l2convert.so gst-launch -v v4l2src device=/dev/video6 ! video/x-raw-yuv,format='(fourcc)'UYVY,width=752,height=480 ! fakesink

The values for GST_DEBUG can range from 1-4, I believe. I usually use 2 or 3, depending on the issue.

Make sure your v4l2src cap filter is correct. I can generate that same error on my laptop by entering an incorrect framerate.

--Will


On Thu, Oct 10, 2013 at 2:18 AM, daveshah <davey1576@gmail.com> wrote:
 I am currently struggling to get hardware accelerated video encoding with
the Caspa Camera and Overo TidalStorm. I have compiled an image with Yocto
containing gstreamer-ti and everything else necessary, but cannot get
gstreamer to work.

Here is the command I am running:
LD_PRELOAD=/usr/lib/libv4l/v4l2convert.so gst-launch -v v4l2src
device=/dev/video6 !
video/x-raw-yuv,format=\(fourcc\)UYVY,width=752,height=480 ! fakesink

Output:

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(2830): gst_base_src_start ():
/GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
Check your filtered caps, if any
Setting pipeline to NULL ...
Freeing pipeline ...

These are my media-ctl settings:
media-ctl -r -l '"mt9v032 3-005c":0->"OMAP3 ISP CCDC":0[1], "OMAP3 ISP
CCDC":2->"OMAP3 ISP preview":0[1], "OMAP3 ISP preview":1->"OMAP3 ISP
resizer":0[1], "OMAP3 ISP resizer":1->"OMAP3 ISP resizer output":0[1]'
media-ctl -f '"mt9v032 3-005c":0[SGRBG10 752x480], "OMAP3 ISP
CCDC":2[SGRBG10 752x480], "OMAP3 ISP preview":1[UYVY 752x480], "OMAP3 ISP
resizer":1[UYVY 752x480]'

I am able to take pictures with mplayer using the following settings:
LD_PRELOAD=/usr/lib/libv4l/v4l2convert.so mplayer tv:// -tv
driver=v4l2:device=/dev/video6 -vo png -fps 1

(Nabble users, apologies for the re-post but the first was not accepted by
the mailing list...)




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--
Will Bryan
Iowa State University | Computer Engineering
william.bryan91@gmail.com | 712.212.5027