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

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Date:   Sat, 18 Mar 2017 20:41:14 -0400
From:   Nicolas Dufresne <nicolas@...fresne.ca>
To:     Russell King - ARM Linux <linux@...linux.org.uk>,
        Steve Longerbeam <steve_longerbeam@...tor.com>
Cc:     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

Le samedi 18 mars 2017 à 20:43 +0000, Russell King - ARM Linux a
écrit :
> 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.)
> 
> How I stumbled across though this was when I was trying to encode:
> 
>  gst-launch-1.0 v4l2src device=/dev/video9 ! bayer2rgbneon ! \
>         videoconvert ! x264enc speed-preset=1 ! avimux ! \
>         filesink location=test.avi
> 
> I noticed that vlc would always say it was playing the resulting AVI
> at 30fps.

In practice, I have the impression there is a fair reason why framerate
enumeration isn't implemented (considering there is only 1 valid rate).
Along with the norm fallback, GStreamer could could also consider the
currently set framerate as returned by VIDIOC_G_PARM. At the same time,
implementing that enumeration shall be straightforward, and will make a
large amount of existing userspace work.

regards,
Nicolas
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