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

[Nicolas Dufresne <nicolas@ndufresne.ca>]

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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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