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

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Date:   Mon, 20 Mar 2017 14:15:41 +0100
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Steve Longerbeam <steve_longerbeam@...tor.com>
Cc:     Russell King - ARM Linux <linux@...linux.org.uk>,
        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,
        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 Sat, 2017-03-18 at 12:58 -0700, Steve Longerbeam wrote:
> 
> On 03/18/2017 12:22 PM, Russell King - ARM Linux wrote:
> > Hi Steve,
> >
> > I've just been trying to get gstreamer to capture and h264 encode
> > video from my camera at various frame rates, and what I've discovered
> > does not look good.
> >
> > 1) when setting frame rates, media-ctl _always_ calls
> >     VIDIOC_SUBDEV_S_FRAME_INTERVAL with pad=0.

To allow setting pad > 0:
https://patchwork.linuxtv.org/patch/39348/

> > 2) media-ctl never retrieves the frame interval information, so there's
> >     no way to read it back with standard tools, and no indication that
> >     this is going on...
> 
> I think Philipp Zabel submitted a patch which addresses these
> in media-ctl. Check with him.

To read back and propagate the frame interval:
https://patchwork.linuxtv.org/patch/39349/
https://patchwork.linuxtv.org/patch/39351/

regards
Philipp