Casting data from v4l2src

[Kristoffer Koch]

Thanks for your quick feedback.

rawvideoparse isn't in gstreamer 1.0 on the stock Ubuntu 16.10, but I'll
try to build the latest gstreamer and check the behaviour there.

Best regards, Kristoffer



On Tue, Mar 21, 2017 at 1:08 PM, Andrew Grace <apenngrace at gmail.com> wrote:

> Not sure if this affects anything, but the docs state that videoparse is
> deprecated and to look at rawvideoparse instead.
>
> (https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-
> bad-plugins/html/gst-plugins-bad-plugins-videoparse.html)
>
> Andrew
>
> On Mar 21, 2017, at 6:57 AM, Kristoffer Koch <kristoffer at huddly.com>
> wrote:
>
> Hi,
>
> We're developing a UVC camera, and as a part of our production test, we
> set the camera into a raw mode, where we output the raw bayer image.
>
> Because reasons, we must lie in the USB-descriptors, so we say that we
> output a YVYU image, while it is really bayer.
>
> Of course, if I do
>
>   gst-launch-1.0 v4l2src ! xvimagesink
>
> it "works", but with a green image.
>
> I'm trying to override the format, but I'm not having any luck:
>
>   gst-launch-1.0 v4l2src device=/dev/video0 !
> video/x-raw,format=YVYU,width=3456,height=2592,framerate=5/1 ! videoparse
> ! video/x-raw,format=rgb,width=3456,height=2592  ! xvimagesink
> Setting pipeline to PAUSED ...
> Pipeline is live and does not need PREROLL ...
> Setting pipeline to PLAYING ...
> New clock: GstSystemClock
> ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Internal
> data flow error.
> Additional debug info:
> gstbasesrc.c(2948): gst_base_src_loop (): /GstPipeline:pipeline0/
> GstV4l2Src:v4l2src0:
> streaming task paused, reason not-negotiated (-4)
> Execution ended after 0:00:00.001297994
> Setting pipeline to PAUSED ...
> Setting pipeline to READY ...
> Setting pipeline to NULL ...
> Freeing pipeline ...
>
> I tried turning up the debug level, but there's not any more details
> coming from the v4l2src element, as far as i can see. If anyone have some
> hints, it's maybe a bit hard to reproduce, but I guess you can try to
> "cast" data on any camera.
>
> Best regards,
> Kristoffer Koch
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