On Sat, Mar 18, 2017 at 08:41:14PM -0400, Nicolas Dufresne wrote:

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.

Since, according to v4l2-compliance, providing the enumeration ioctls
appears to be optional:

1) should v4l2-compliance be checking whether other frame sizes/frame
   intervals are possible, and failing if the enumeration ioctls are
   not supported?

2) would it also make sense to allow gstreamer's v4l2src to try setting
   a these parameters, and only fail if it's unable to set it?  IOW, if
   I use:

gst-launch-1.0 v4l2src device=/dev/video10 ! \
	video/x-bayer,format=RGGB,framerate=20/1 ! ...

   where G_PARM says its currently configured for 25fps, but a S_PARM
   with 20fps would actually succeed.

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