Re: v4l error on stretch c2

From: Nicolas Dufresne <nicolas@ndufresne.ca>
To: Carl Karsten <carl@nextdayvideo.com>, linux-amlogic@lists.infradead.org
Subject: Re: v4l error on stretch c2
Date: Thu, 11 Apr 2019 13:27:45 -0400	[thread overview]
Message-ID: <c78ecdb2130e8ed68b4604b584e30e6e653f278a.camel@ndufresne.ca> (raw)
In-Reply-To: <CADmzSSjwqDgabEbzq3Co3oRVW=kJRE4Dnyyqvzw=RxBDTr7Z+g@mail.gmail.com>

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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
> 
> 

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