[gst-devel] v4l2sink with USB webcam gadget

[Marco Ballesio]

Hi,

On Wed, Feb 9, 2011 at 9:17 PM, Will Kelleher <will.kelleher at nuvixa.com> wrote:
> Hi everyone,
>
> I've been trying to use my TI Davinci hardware as a USB webcam gadget.
>  I backported the webcam module to the 2.6.32 kernel and I can
> compile/load it successfully.  This module creates a v4l2 output
> device that can accept YUY2 and MJPEG formats.
>
> When I run
>
> gst-launch videotestsrc ! v4l2sink device=/dev/video1
>
> I get
>
> "ERROR: from element
> /GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0: Could not
> negotiate format"

probably you need to convert format/resolution/frame rate. If you want
to know what went wrong with your caps negotiation, use -m as an
option for gst-launch. If you want even more details, you can set
GST_DEBUG=GST_CAPS:3 (or more).

A a last note, adding an ffmpegcolorspace ! videoscale ! videorate (or
a subet of the pipe) may help you.

Regard

>
> I've tried a variety of other pipelines but they all produce the same error.
>
> Does anyone have experience with sending output to this particular
> module (g_webcam)?  Am I doing something obviously wrong?
>
> Thanks,
>
> Will Kelleher
> Nuvixa, Inc.
>
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------------------------------------------------------------------------------
The ultimate all-in-one performance toolkit: Intel(R) Parallel Studio XE:
Pinpoint memory and threading errors before they happen.
Find and fix more than 250 security defects in the development cycle.
Locate bottlenecks in serial and parallel code that limit performance.
http://p.sf.net/sfu/intel-dev2devfeb
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