Re: [gst-devel] v4l2sink with USB webcam gadget

[Marco B. <gib...@gm...>]

Hi,

On Wed, Feb 9, 2011 at 9:17 PM, Will Kelleher <wil...@nu...> 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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