linux-kernel - Re: [PATCH v5 00/39] i.MX Media Driver

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Date:   Sun, 19 Mar 2017 14:21:10 +0000
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Vladimir Zapolskiy <vladimir_zapolskiy@...tor.com>
Cc:     Steve Longerbeam <steve_longerbeam@...tor.com>,
        Steve Longerbeam <slongerbeam@...il.com>, robh+dt@...nel.org,
        mark.rutland@....com, shawnguo@...nel.org, kernel@...gutronix.de,
        fabio.estevam@....com, mchehab@...nel.org, hverkuil@...all.nl,
        nick@...anahar.org, markus.heiser@...marIT.de,
        p.zabel@...gutronix.de, laurent.pinchart+renesas@...asonboard.com,
        bparrot@...com, geert@...ux-m68k.org, arnd@...db.de,
        sudipm.mukherjee@...il.com, minghsiu.tsai@...iatek.com,
        tiffany.lin@...iatek.com, jean-christophe.trotin@...com,
        horms+renesas@...ge.net.au, niklas.soderlund+renesas@...natech.se,
        robert.jarzmik@...e.fr, songjun.wu@...rochip.com,
        andrew-ct.chen@...iatek.com, gregkh@...uxfoundation.org,
        shuah@...nel.org, sakari.ailus@...ux.intel.com, pavel@....cz,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        devel@...verdev.osuosl.org
Subject: Re: [PATCH v5 00/39] i.MX Media Driver

On Sun, Mar 19, 2017 at 03:57:56PM +0200, Vladimir Zapolskiy wrote:
> Hi Russell,
> 
> On 03/18/2017 10:43 PM, Russell King - ARM Linux wrote:
> > On Sat, Mar 18, 2017 at 12:58:27PM -0700, Steve Longerbeam wrote:
> >> Can you share your gstreamer pipeline? For now, until
> >> VIDIOC_ENUM_FRAMESIZES is implemented, try a pipeline that
> >> does not attempt to specify a frame rate. I use the attached
> >> script for testing, which works for me.
> > 
> > It's nothing more than
> > 
> >   gst-launch-1.0 -v v4l2src ! <any needed conversions> ! xvimagesink
> > 
> > in my case, the conversions are bayer2rgbneon.  However, this only shows
> > you the frame rate negotiated on the pads (which is actually good enough
> > to show the issue.)
> 
> I'm sorry for potential offtopic, but is bayer2rgbneon element found in
> any officially supported by GStreamer plugin?

No it isn't.  Google is wonderful, please make use of planetary search
facilities.

> Can it be a point of failure?

There's a good reason why I dumped a full debug log using GST_DEBUG=*:9,
analysed it for the cause of the failure, and tried several different
pipelines, including the standard bayer2rgb plugin.

Please don't blame this on random stuff after analysis of the logs _and_
reading the appropriate plugin code has shown where the problem is.  I
know gstreamer can be very complex, but it's very possible to analyse
the cause of problems and pin them down with detailed logs in conjunction
with the source code.

-- 
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