Re: v4l error on stretch c2

[Carl Karsten <carl@nextdayvideo.com>]

I don't think I saw anything in dmesg, is that where kernel logs would be?

and it is working.  except I think it is maxing out a cpu core.

On Thu, Apr 11, 2019 at 12:27 PM Nicolas Dufresne <nicolas@ndufresne.ca> wrote:
>
> Le jeudi 11 avril 2019 à 10:25 -0500, Carl Karsten a écrit :
> > Hmm, it magically fixed itself. maybe.
> > even after a reboot.
>
> You should have capture the kernel logs after the error. We still have
> very fragile camera firmware around which Gst probing endup crashing
> right before we start capturing. I have drastically reduced the number
> of ioctl we do to reach capture state, which solves some of the
> firmware crash issue fully or partially, I'm not sure what Gst version
> you are on, but it's always worth trying a newer version.
>
> In your code, if you catch an V4L2 error, then most of the time you
> just have to wait between 15 and 30s before retrying while uvc driver
> is resetting the camera.
>
> >
> > here is baseline of what works when the v4l device was erroring:
> >
> > More info:
> > https://www.armbian.com/odroid-c2/ Stretch
> >
> > modprobe vivid
> > dmesg
> > [33294.994948] vivid-000: V4L2 capture device registered as video3
> >
> > root@odroid3:~# gst-launch-1.0 v4l2src device=/dev/video3 ! fakesink
> > Setting pipeline to PAUSED ...
> > Pipeline is live and does not need PREROLL ...
> > Setting pipeline to PLAYING ...
> > New clock: GstSystemClock
> >
> > (no error)
> >
> >
> >
> >
> >
> >
> > On Thu, Apr 11, 2019 at 1:16 AM Carl Karsten <carl@nextdayvideo.com> wrote:
> > > I'm getting errors reading a uvc video stream:
> > >
> > > Linux odroid3 4.19.20-meson64 #5.75 SMP PREEMPT Fri Feb 8 10:08:40 CET
> > > 2019 aarch64 GNU/Linux
> > >
> > >  gst-launch-1.0 v4l2src device=/dev/hdmi2usb/by-num/all0/video ! fakesink
> > > error: XDG_RUNTIME_DIR not set in the environment.
> > > 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: Could
> > > not read from resource.
> > > Additional debug info:
> > > gstv4l2bufferpool.c(1058): gst_v4l2_buffer_pool_poll ():
> > > /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
> > > poll error 1: Invalid argument (22)
> > > Execution ended after 0:00:18.608430528
> > > Setting pipeline to PAUSED ...
> > > Setting pipeline to READY ...
> > > Setting pipeline to NULL ...
> > > Freeing pipeline ...
> > >
> > >  gst-launch-1.0 v4l2src device=/dev/hdmi2usb/by-num/all0/video ! fakesink
> > > Setting pipeline to PAUSED ...
> > > ERROR: Pipeline doesn't want to pause.
> > > ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Device
> > > '/dev/hdmi2usb/by-num/all0/video' is not a capture device.
> > > Additional debug info:
> > > v4l2_calls.c(633): gst_v4l2_open (): /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
> > > Capabilities: 0x4a00000
> > > Setting pipeline to NULL ...
> > > Freeing pipeline ...
> > >
> > > --
> > > Carl K
> >
> >



-- 
Carl K

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