Le vendredi 15 février 2019 à 12:10 +0100, Philipp Zabel a écrit :
> > I'm also not sure how to specify hflip/vflip... I don't think
> > extra-controls parses 'hflip', 'vflip' as ipu_csc_scaler_s_ctrl gets
> > called with V4L2_CID_HFLIP/V4L2_CID_VFLIP but ctrl->val is always 0.
> 
> You can use v4l2-ctl -L to list the CID names, they are horizontal_flip
> and vertical_flip, respectively. Again, the input and output formats
> must be different because GStreamer doesn't know about the flipping yet:
> 
> gst-launch-1.0 videotestsrc ! video/x-raw,width=320,height=240 ! v4l2video10convert extra-controls=cid,horizontal_flip=1 ! video/x-raw,width=640,height=480 ! kmssink can-scale=false
> 
> We'd have to add actual properties for rotate/flip to v4l2convert,
> instead of using theextra-controls workaround, probable something
> similar to the video-direction property of the software videoflip
> element.

Note that we have a disable-passthrough property in master, a trivial
patch to backport if you need it.

https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/commit/fe5236be8771ea82c850ebebe19cf1064d112bf0