Le samedi 18 mars 2017 ? 20:43 +0000, Russell King - ARM Linux a
?crit?:

On Sat, Mar 18, 2017 at 12:58:27PM -0700, Steve Longerbeam wrote:

quoted

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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